ORCID Profile
0000-0003-1312-9391
Current Organisations
Australian Academy of Science
,
University of Western Australia
,
California Institute of Technology
,
Jet Propulsion Laboratory
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Plant Physiology | Phylogeny and Comparative Analysis | Ecological Applications not elsewhere classified | Genetics | Evolutionary Biology | Plant Systematics and Taxonomy | Population, Ecological and Evolutionary Genetics | Animal Systematics and Taxonomy | Biogeography and Phylogeography
ANZSRC Socio-Economic Objective (SEO)
Sparseland, Permanent Grassland and Arid Zone Flora, Fauna and Biodiversity | Documentation of Undescribed Flora and Fauna | Rehabilitation of Degraded Mining Environments | Expanding Knowledge in the Biological Sciences | Mining Flora, Fauna and Biodiversity | Flora, Fauna and Biodiversity at Regional or Larger Scales |
Related Links
Publications
Performance of the Apache Point Observatory Galactic Evolution Experiment (APOGEE) high-resolution near-infrared multi-object fiber spectrograph
Publisher: SPIE
Date: 24-09-2012
DOI: 10.1117/12.927140
The Aligned Orbit of WASP-148b, the Only Known Hot Jupiter with a nearby Warm Jupiter Companion, from NEID and HIRES
Publisher: American Astronomical Society
Date: 02-2022
Abstract: We present spectroscopic measurements of the Rossiter–McLaughlin effect for WASP-148b, the only known hot Jupiter with a nearby warm-Jupiter companion, from the WIYN/NEID and Keck/HIRES instruments. This is one of the first scientific results reported from the newly commissioned NEID spectrograph, as well as the second obliquity constraint for a hot Jupiter system with a close-in companion, after WASP-47. WASP-148b is consistent with being in alignment with the sky-projected spin axis of the host star, with λ = − 8 .° 2 − 9 .° 7 + 8 .° 7 . The low obliquity observed in the WASP-148 system is consistent with the orderly-alignment configuration of most compact multi-planet systems around cool stars with obliquity constraints, including our solar system, and may point to an early history for these well-organized systems in which migration and accretion occurred in isolation, with relatively little disturbance. By contrast, previous results have indicated that high-mass and hot stars appear to more commonly host a wide range of misaligned planets: not only single hot Jupiters, but also compact systems with multiple super-Earths. We suggest that, to account for the high rate of spin–orbit misalignments in both compact multi-planet and isolated-hot-Jupiter systems orbiting high-mass and hot stars, spin–orbit misalignments may be caused by distant giant planet perturbers, which are most common around these stellar types.
Spartothamnella canescens (Lamiaceae: Chloantheae), a new species from Western and Central Australia, with notes on the status of S. sp. Helena & Aurora Range
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 21-08-2014
DOI: 10.58828/NUY00716
Principles for creating a single authoritative list of the world’s species
Publisher: Public Library of Science (PLoS)
Date: 07-07-2020
Two new and rare species of Ptilotus (Amaranthaceae) from the Eneabba sandplains, Western Australia
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 21-08-2014
DOI: 10.58828/NUY00712
Arid Australia as a source of plant diversity
Publisher: CSIRO Publishing
Date: 14-09-2021
DOI: 10.1071/SB21012
Abstract: In the present study, we tested the chronological and geographic origins of the mostly arid Australian Ptilotus (Amaranthaceae) and its close relatives (i.e. the ‘aervoids’) by reconstructing a dated phylogeny with near-comprehensive s ling for Ptilotus and estimating ancestral geographic ranges. We investigated climatic niche evolution within Ptilotus and identified likely climatic origins and subsequent niche shifts by reconstructing ancestral states of climatic variables on the phylogeny, which was visualised using a phyloecospace approach. Geospatial analyses were employed to identify probable ersification hotspots within Australia. We inferred that the aervoids originated in Oligocene Africa–Asia and that Ptilotus arrived in northern Australia by dispersal in the Early Miocene. Subsequent ersification of Ptilotus was rapid, giving rise to all major clades in the western Eremaean by the time of an aridification pulse in the Middle Miocene. Climatic niche shifts from the arid Eremaean into monsoonal northern and temperate southern Australia are apparent for multiple independent species groups. Our analyses support the hypothesis that a pre-adaptation to aridity and early arrival in an aridifying Australia were integral to the success of Ptilotus, and that the Eremaean has been a source of bio ersity in the genus and for independent radiations into neighbouring climatic zones.
Competing drivers lead to non-linear native-exotic relationships in endangered temperate grassy woodlands
Publisher: Springer Science and Business Media LLC
Date: 20-06-2016
Some, but not all, eponyms should be disallowed
Publisher: Springer Science and Business Media LLC
Date: 19-06-2023
A new and rare species of Nymphoides (Menyanthaceae) from the North West of Western Australia
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 13-12-2016
DOI: 10.58828/NUY00794
Review of the infrageneric classification of Adenanthos (Proteaceae)—the subsections of Adenanthos are polyphyletic
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 24-06-2021
DOI: 10.58828/NUY01000
Hemigenia tichbonii (Lamiaceae), a new, rare species from Western Australia
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 07-2016
DOI: 10.58828/NUY00792
Two Western Australian species of Ozothamnus transferred to Pithocarpa (Asteraceae: Gnaphalieae)
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 28-03-2013
DOI: 10.58828/NUY00671
Quantifying contaminant losses to water from pastoral landuses in New Zealand I. Development of a spatial framework for assessing losses at a farm scale
Publisher: Informa UK Limited
Date: 07-06-2021
Reticulate Evolution, Ancient Chloroplast Haplotypes, and Rapid Radiation of the Australian Plant Genus Adenanthos (Proteaceae)
Publisher: Frontiers Media SA
Date: 13-01-2021
Abstract: Cytonuclear discordance, commonly detected in phylogenetic studies, is often attributed to hybridization and/or incomplete lineage sorting (ILS). New sequencing technologies and analytical approaches can provide new insights into the relative importance of these processes. Hybridization has previously been reported in the Australian endemic plant genus Adenanthos (Proteaceae). Like many Australian genera, Adenanthos is of relatively ancient origin, and provides an opportunity to examine long-term evolutionary consequences of gene flow between lineages. Using a hybrid capture approach, we assembled densely s led low-copy nuclear and plastid DNA sequences for Adenanthos , inferred its evolutionary history, and used a Bayesian posterior predictive approach and coalescent simulations to assess relative contributions of hybridization and ILS to cytonuclear discordance. Our analyses indicate that strong incongruence detected between our plastid and nuclear phylogenies is not only the result of ILS, but also results from extensive ancient introgression as well as recent chloroplast capture and introgression between extant Adenanthos species. The deep reticulation was also detected from long-persisting chloroplast haplotypes shared between evolutionarily distant species. These haplotypes may have persisted for over 12 Ma in localized populations across southwest Western Australia, indicating that the region is not only an important area for old endemic lineages and accumulation of species, but is also characterized by persistence of high genetic ersity. Deep introgression in Adenanthos coincided with the rapid radiation of the genus during the Miocene, a time when many Australian temperate plant groups radiated in response to large-scale climatic change. This study suggests that ancient introgression may play an important role in the evolution of the Australian flora more broadly.
Stellar spectroscopy in the near-infrared with a laser frequency comb
Publisher: The Optical Society
Date: 20-02-2019
Resolution of the Eremophila tietkensii (Scrophulariaceae) species complex based on congruence between morphological and molecular pattern analyses
Publisher: CSIRO Publishing
Date: 02-03-2022
DOI: 10.1071/SB21005
Abstract: Eremophila R.Br. comprises at least 238 species endemic to Australia, with many more having not yet been formally described. Three putative new taxa, namely, E. sp. Hamersley Range (K. Walker KW 136), E. sp. Calvert Range (A. A. Burbidge 738) and E. sp. Rudall River (P. G. Wilson 10512), were segregated from a broadly defined E. tietkensii F.Muell. & Tate by J. Hurter at the Western Australian Herbarium in 2012. Both E. sp. Hamersley Range and E. sp. Rudall River are listed as being of conservation concern in Western Australia, the former occurring in the Pilbara region in areas of prospective interest for mining development. We sought to determine whether these phrase-named entities should be formally described as new species, using multivariate analyses of morphometric and molecular data derived from specimens in the Western Australia Herbarium. Eremophila sp. Rudall River could not be adequately separated from E. tietkensii by either morphological or molecular data, and is here included within that species. By contrast, E. sp. Hamersley Range and E. sp. Calvert Range are clearly morphologically and genetically distinct. We thus describe them here as the new species E. naaykensii A.L.Curtis & K.R.Thiele and E. hurteri A.L.Curtis & K.R.Thiele. The recognition of these taxa will help inform their conservation prioritisation and subsequent management.
A revision of the
Publisher: CSIRO Publishing
Date: 10-05-2019
DOI: 10.1071/SB18007
Abstract: The Hibbertia commutata Steud. species group comprises 27 species in Hibbertia Andr. subgenus Hibbertia, all being endemic in south-western Western Australia it is the largest species group in that state. Several taxa in the group have been the subject of considerable confusion in the past, with inadequate understanding of species boundaries leading to mixed determinations on specimens. All taxa in the group are treated here, and the following are described as new: Hibbertia acrotoma K.R.Thiele, H. ambita K.R.Thiele, H. barrettiae K.R.Thiele, H. davisii K.R.Thiele, H. elegans K.R.Thiele, H. hortiorum K.R.Thiele, H. improna K.R.Thiele, H. inopinata K.R.Thiele, H. sandifordiae K.R.Thiele, H. semipilosa K.R.Thiele, H. spectabilis K.R.Thiele, H. wheelerae K.R.Thiele.
NEID Rossiter–McLaughlin Measurement of TOI-1268b: A Young Warm Saturn Aligned with Its Cool Host Star
Publisher: American Astronomical Society
Date: 02-2022
Abstract: Close-in gas giants present a surprising range of stellar obliquity, the angle between a planet’s orbital axis and its host star’s spin axis. It is unclear whether the obliquities reflect the planets’ dynamical history (e.g., aligned for in situ formation or disk migration versus misaligned for high-eccentricity tidal migration) or whether other mechanisms (e.g., primordial misalignment or planet–star interactions) are more important in sculpting the obliquity distribution. Here we present the stellar obliquity measurement of TOI-1268 (TIC-142394656, V mag ∼ 10.9), a young K-type dwarf hosting an 8.2 day period, Saturn-sized planet. TOI-1268’s lithium abundance and rotation period suggest the system age between the ages of the Pleiades cluster (∼120 Myr) and the Prasepe cluster (∼670 Myr). Using the newly commissioned NEID spectrograph, we constrain the stellar obliquity of TOI-1268 via the Rossiter–McLaughlin effect from both radial velocity and Doppler tomography signals. The 3 σ upper bounds of the projected stellar obliquity ∣ λ ∣ from both models are below 60°. The large host star separation ( a / R ⋆ ∼ 17), combined with the system’s young age, makes it unlikely that the planet has realigned its host star. The stellar obliquity measurement of TOI-1268 probes the architecture of a young gas giant beyond the reach of tidal realignment ( a / R ⋆ ≳ 10) and reveals an aligned or slightly misaligned system.
A conceptual model of vegetation dynamics for the unique obligate‐seeder eucalypt woodlands of south‐western Australia
Publisher: Wiley
Date: 23-04-2018
DOI: 10.1111/AEC.12613
The Habitable-zone Planet Finder: A status update on the development of a stabilized fiber-fed near-infrared spectrograph for the for the Hobby-Eberly telescope
Publisher: SPIE
Date: 24-07-2014
DOI: 10.1117/12.2056417
DNA sequences as types: A discussion paper from the Special‐purpose Committee established at the XIX International Botanical Congress in Shenzhen, China
Publisher: Wiley
Date: 17-05-2023
DOI: 10.1002/TAX.12931
Abstract: A special‐purpose Committee on DNA Sequences as Types was established at the XIX International Botanical Congress (IBC) in Shenzhen, China, in 2017, with a mandate to report to the XX IBC in Madrid in 2024 with recommendations on a preferred course of action with respect to potential amendments of the International Code of Nomenclature for algae, fungi, and plants to allow DNA sequences as types. This is the first in an expected series of papers from the Special‐purpose Committee on this issue. We set out the background to the establishment of the Committee, explore key issues around typification that are pertinent to the question of DNA sequences as types, enumerate pros and cons of allowing DNA sequences as types, and foreshadow options for future discussion and potential recommendations.
Extinction pulse at Eocene–Oligocene boundary drives diversification dynamics of two Australian temperate floras
Publisher: The Royal Society
Date: 22-01-2020
Abstract: The ersification dynamics of the Australian temperate flora remains poorly understood. Here, we investigate whether differences in plant richness in the southwest Australian (SWA) bio ersity hotspot and southeast Australian (SEA) regions of the Australian continent can be attributed to higher net ersification, more time for species accumulation, or both. We assembled dated molecular phylogenies for the 21 most species-rich flowering plant families found across mesic temperate Australia, encompassing both SWA and SEA regions, and applied a series of ersification models to investigate responses across different groups and timescales. We show that the high richness in SWA can be attributed to a higher net rate of lineage ersification and more time for species accumulation. Different pulses of ersification were retrieved in each region. A decrease in ersification rate across major flowering plant lineages at the Eocene–Oligocene boundary ( ca 34 Ma) was witnessed in SEA but not in SWA. Our study demonstrates the importance of historical ersification pulses and differential responses to global events as drivers of present-day ersity. More broadly, we show that ersity within the SWA bio ersity hotspot is not only the result of recent radiations, but also reflects older events over the history of this planet.
Nondetection of Helium in the Upper Atmospheres of TRAPPIST-1b, e, and f*
Publisher: American Astronomical Society
Date: 02-08-2021
AN EFFICIENT, COMPACT, AND VERSATILE FIBER DOUBLE SCRAMBLER FOR HIGH PRECISION RADIAL VELOCITY INSTRUMENTS
Publisher: American Astronomical Society
Date: 09-06-2015
Sansevieria (Asparagaceae, Nolinoideae) is a herbaceous clade within Dracaena: inference from non-coding plastid and nuclear DNA sequence data
Publisher: Magnolia Press
Date: 22-11-2018
DOI: 10.11646/PHYTOTAXA.376.6.2
Abstract: The evolutionary history of the dracaenoid genera Dracaena and Sansevieria (Asparagaceae, Nolinoideae) remains poorly resolved, despite long-recognised issues with their generic boundaries and increased attention paid by both horticulturalists and taxonomists. In this study we aim to: (1) elucidate evolutionary relationships within and between Dracaena and Sansevieria using molecular phylogenetic inference of both nuclear (nDNA) and plastid (cpDNA) markers, (2) examine the infrageneric classifications of each genus, and (3) revise the circumscription of the dracaenoids in light of morphological and phylogenetic evidence. In total, we s led 21 accessions of Dracaena (ca. 19 species), 27 accessions of Sansevieria (ca. 26 species), and six outgroup taxa. Phylogenetic analyses were based on nucleotide sequences of two non-coding plastid DNA regions, the trnL-F region (trnL intron and trnL-trnF intergenic spacer) and rps16 intron, and the low-copy nuclear region At103. Phylogenetic hypotheses were constructed using maximum parsimony, maximum likelihood, and Bayesian inference. In idual datasets were analysed separately and, after testing for congruence, as combined datasets. We recovered instances of soft incongruence between nDNA and cpDNA datasets in Sansevieria, but general trends in the dracaenoids were congruent, although often poorly supported or resolved. The dracaenoids constitute a strongly supported monophyletic group. Dracaena was resolved as a paraphyletic grade embedded with two clades of Sansevieria, a primary clade comprising most species, and a secondary clade including S. sambiranensis, a distinctive species from Madagascar. The backbone of our phylogeny was only resolved in nDNA analyses, but combined analyses recovered strongly supported species groups. None of the previous infrageneric classifications were supported by our phylogeny, and biogeographic groupings were frequently more significant than morphology. More work is needed to resolve internal relationships in the dracaenoids, but we support a recent proposal to recognise a broadened circumscription of Dracaena that includes Sansevieria. We provide a generic description for the recircumscribed Dracaena and new combinations for several species of Sansevieria in Dracaena.
Observing the Sun as a Star: Design and Early Results from the NEID Solar Feed
Publisher: American Astronomical Society
Date: 22-03-2022
Abstract: Efforts with extreme-precision radial velocity (EPRV) instruments to detect small- litude planets are largely limited, on many timescales, by the effects of stellar variability and instrumental systematics. One avenue for investigating these effects is the use of small solar telescopes which direct disk-integrated sunlight to these EPRV instruments, observing the Sun at high cadence over months or years. We have designed and built a solar feed system to carry out “Sun-as-a-star” observations with NEID, a very high precision Doppler spectrometer recently commissioned at the WIYN 3.5 m Telescope at Kitt Peak National Observatory. The NEID solar feed has been taking observations nearly every day since 2020 December data is publicly available at the NASA Exoplanet Science Institute NEID Solar Archive: earch_solar.php . In this paper, we present the design of the NEID solar feed and explanations behind our design intent. We also present early radial velocity (RV) results which demonstrate NEID’s RV stability on the Sun over 4 months of commissioning: 0.66 m s −1 rms under good sky conditions and improving to 0.41 m s −1 rms under best conditions.
TOI-1696 and TOI-2136: Constraining the Masses of Two Mini-Neptunes with the Habitable-Zone Planet Finder
Publisher: American Astronomical Society
Date: 23-05-2022
Abstract: We present the validation of two planets orbiting M dwarfs, TOI-1696b and TOI-2136b. Both planets are mini-Neptunes orbiting nearby stars, making them promising prospects for atmospheric characterization with the James Webb Space Telescope (JWST). We validated the planetary nature of both candidates using high-contrast imaging, ground-based photometry, and near-infrared radial velocities. Adaptive optics images were taken using the ShARCS camera on the 3 m Shane Telescope. Speckle images were taken using the NN-Explore Exoplanet Stellar Speckle Imager on the WIYN 3.5 m telescope. Radii and orbital ephemerides were refined using a combination of the Transiting Exoplanet Survey Satellite, the diffuser-assisted Astrophysical Research Consortium (ARC) Telescope Imaging Camera (ARCTIC) imager on the 3.5 m ARC telescope at Apache Point Observatory, and the 0.6 m telescope at Red Buttes Observatory. We obtained radial velocities using the Habitable-Zone Planet Finder on the 10 m Hobby–Eberly Telescope, which enabled us to place upper limits on the masses of both transiting planets. TOI-1696b ( P = 2.5 days R p = 3.24 R ⊕ M p 56.6 M ⊕ ) falls into a sparsely populated region of parameter space considering its host star’s temperature ( T eff = 3168 K, M4.5), as planets of its size are quite rare around mid- to late-M dwarfs. On the other hand, TOI-2136b ( P = 7.85 days R p = 2.09 R ⊕ M p 15.0 M ⊕ ) is an excellent candidate for atmospheric follow-up with the JWST.
Towards a global list of accepted species III. Independence and stakeholder inclusion
Publisher: Springer Science and Business Media LLC
Date: 13-07-2021
Infrared Astronomical Spectroscopy for Radial Velocity Measurements with 10 cm/s Precision
Publisher: OSA
Date: 2018
The Warm Neptune GJ 3470b Has a Polar Orbit
Publisher: American Astronomical Society
Date: 26-05-2022
Abstract: The warm Neptune GJ 3470b transits a nearby ( d = 29 pc) bright slowly rotating M1.5-dwarf star. Using spectroscopic observations during two transits with the newly commissioned NEID spectrometer on the WIYN 3.5 m Telescope at Kitt Peak Observatory, we model the classical Rossiter–McLaughlin effect, yielding a sky-projected obliquity of λ = 98 − 12 + 15 ◦ and a v sin i = 0.85 − 0.33 + 0.27 km s − 1 . Leveraging information about the rotation period and size of the host star, our analysis yields a true obliquity of ψ = 95 − 8 + 9 ◦ , revealing that GJ 3470b is on a polar orbit. Using radial velocities from HIRES, HARPS, and the Habitable-zone Planet Finder, we show that the data are compatible with a long-term radial velocity (RV) slope of γ ̇ = − 0.0022 ± 0.0011 m s − 1 day − 1 over a baseline of 12.9 yr. If the RV slope is due to acceleration from another companion in the system, we show that such a companion is capable of explaining the polar and mildly eccentric orbit of GJ 3470b using two different secular excitation models. The existence of an outer companion can be further constrained with additional RV observations, Gaia astrometry, and future high-contrast imaging observations. Lastly, we show that tidal heating from GJ 3470b’s mild eccentricity has most likely inflated the radius of GJ 3470b by a factor of ∼1.5–1.7, which could help account for its evaporating atmosphere.
Spring burns control exotic annual grasses in a temperate grassy woodland.
Publisher: Wiley
Date: 08-2004
Broadband Stability of the Habitable Zone Planet Finder Fabry–Pérot Etalon Calibration System: Evidence for Chromatic Variation
Publisher: American Astronomical Society
Date: 05-05-2021
Abstract: The comblike spectrum of a white light–illuminated Fabry–Pérot etalon can serve as a cost-effective and stable reference for precise Doppler measurements. Understanding the stability of these devices across their broad (hundreds of nanometers) spectral bandwidths is essential to realizing their full potential as Doppler calibrators. However, published descriptions remain limited to small bandwidths or short time spans. We present an ∼6 month broadband stability monitoring c aign of the Fabry–Pérot etalon system deployed with the near-infrared Habitable Zone Planet Finder (HPF) spectrograph. We monitor the wavelengths of each of ∼3500 resonant modes measured in HPF spectra of this Fabry–Pérot etalon (free spectral range = 30 GHz, bandwidth = 820–1280 nm), leveraging the accuracy and precision of an electro-optic frequency comb reference. These results reveal chromatic structure in the Fabry–Pérot mode locations and their evolution with time. We measure an average drift on the order of 2 cm s –1 day −1 , with local departures up to ±5 cm s –1 day −1 . We discuss these behaviors in the context of the Fabry–Pérot etalon mirror dispersion and other optical properties of the system and the implications for the use of similar systems for precise Doppler measurements. Our results show that this system supports the wavelength calibration of HPF at the ≲10 cm s −1 level over a night and the ≲30 cm s −1 level over ∼10 days. Our results also highlight the need for long-term and spectrally resolved study of similar systems that will be deployed to support Doppler measurement precision approaching ∼10 cm s −1 .
Wadithamnus, a new monotypic genus in amaranthaceae
Publisher: Magnolia Press
Date: 08-02-2017
DOI: 10.11646/PHYTOTAXA.295.2.5
Abstract: A new monotypic genus from near-coastal areas of Oman and Yemen is here described and named Wadithamnus. The generitype is Wadithamnus artemisioides comb. nov. (basionym Aerva artemisioides). On the basis of morphology, W. artemisioides can be separated from Aerva on the basis of its 3(–7)-flowered cymes and flowers with two outer and four inner tepals, and four stamens alternating with the inner tepals. Molecular data (nuclear ITS and chloroplast trnK–matK sequences) confirm Wadithamnus as a distinct genus outside Aerva, the latter marker placing it at a basal position to the achyranthoid clade. The name Aerva artemisioides is lectotypified on a specimen preserved at WU.
Dealing with inappropriate honorifics in a structured and defensible way is possible
Publisher: Wiley
Date: 02-05-2022
DOI: 10.1002/TAX.12742
Abstract: In a recent article electronically published in Taxon as a “Point of View” in 2021 (and subsequently in hardcopy as a “Perspective” in 2022), Gideon F. Smith and Estrela Figueiredo commented on the undesirability of the continued commemoration of people of severely questionable ethics, including the imperialist Cecil John Rhodes (1853–1902), in botanical nomenclature. Independently addressing a similar topic at around the same time, Timothy A. Hammer and Kevin R. Thiele published proposals to amend Articles 51 and 56 and Division III of the Code , to allow the considered rejection of culturally offensive and inappropriate names. Subsequently, widely circulated responses to Smith & Figueiredo (2022) and Hammer & Thiele (2021) severely misrepresented our positions and views. We here respond to allegations that what we proposed will damage plant nomenclature, and clarify and further substantiate our views.
(119–122) Proposals to amend Articles 51 and 56 and Division III, to allow the rejection of culturally offensive and inappropriate names
Publisher: Wiley
Date: 12-2021
DOI: 10.1002/TAX.12620
Keck Planet Finder: design updates
Publisher: SPIE
Date: 13-12-2020
DOI: 10.1117/12.2561783
Checklist of the vascular flora of the Sunda-Sahul Convergence Zone
Publisher: Pensoft Publishers
Date: 18-05-2020
DOI: 10.3897/BDJ.8.E51094
Abstract: Background The Sunda-Sahul Convergence Zone, defined here as the area comprising Australia, New Guinea, and Southeast Asia (Indonesia to Myanmar), straddles the Sunda and Sahul continental shelves and is one of the most biogeographically famous and important regions in the world. Floristically, it is thought to harbour a large amount of the world’s ersity. Despite the importance of the area, a checklist of the flora has never before been published. Here we present the first working checklist of vascular plants for the Sunda-Sahul Convergence Zone. The list was compiled from 24 flora volumes, online databases and unpublished plot data. Taxonomic nomenclature was updated, and each species was coded into nested biogeographic regions. The list includes 60,415 species in 5,135 genera and 363 families of vascular plants. New information This is the first species-level checklist of the region and presents an updated census of the region’s floristic bio ersity. The checklist confirms that species richness of the SSCZ is comparable to that of the Neotropics, and highlights areas in need of further documentation and taxonomic work. This checklist provides a novel dataset for studying floristic ecology and evolution in this biogeographically important region of very high global bio ersity.
Hibbertia advena (Dilleniaceae), a new and rare species from Queensland with transcontinental affinities
Publisher: Atlas of Living Australia
Date: 16-11-2022
DOI: 10.54102/AJT.AI521
Abstract: The new species Hibbertia advena T.Hammer & Toelken is described. It occurs in north-east Queensland but shares a strong morphological affinity with members of the H. exasperata (Steud.) Briq. species group, which are widespread in south-west Western Australia. This may be an ex le of a very wide transcontinental disjunction in Australian Hibbertia. The biogeographic significance of such disjunctions is briefly discussed, pending further insights when a more complete molecular phylogeny of the genus is generated.
A Close-in Puffy Neptune with Hidden Friends: The Enigma of TOI 620
Publisher: American Astronomical Society
Date: 16-05-2022
Abstract: We present the validation of a transiting low-density exoplanet orbiting the M2.5 dwarf TOI 620 discovered by the NASA Transiting Exoplanet Survey Satellite (TESS) mission. We utilize photometric data from both TESS and ground-based follow-up observations to validate the ephemerides of the 5.09 day transiting signal and vet false-positive scenarios. High-contrast imaging data are used to resolve the stellar host and exclude stellar companions at separations ≳0.″2. We obtain follow-up spectroscopy and corresponding precise radial velocities (RVs) with multiple precision radial velocity (PRV) spectrographs to confirm the planetary nature of the transiting exoplanet. We calculate a 5 σ upper limit of M P 7.1 M ⊕ and ρ P 0.74 g cm −3 , and we identify a nontransiting 17.7 day candidate. We also find evidence for a substellar (1–20 M J ) companion with a projected separation ≲20 au from a combined analysis of Gaia, adaptive optics imaging, and RVs. With the discovery of this outer companion, we carry out a detailed exploration of the possibilities that TOI 620 b might instead be a circum-secondary planet or a pair of eclipsing binary stars orbiting the host in a hierarchical triple system. We find, under scrutiny, that we can exclude both of these scenarios from the multiwavelength transit photometry, thus validating TOI 620 b as a low-density exoplanet transiting the central star in this system. The low density of TOI 620 b makes it one of the most amenable exoplanets for atmospheric characterization, such as with the James Webb Space Telescope and Ariel, validated or confirmed by the TESS mission to date.
“MODAL NOISE” IN SINGLE-MODE FIBERS: A CAUTIONARY NOTE FOR HIGH PRECISION RADIAL VELOCITY INSTRUMENTS
Publisher: American Astronomical Society
Date: 21-11-2015
Plants will cross the lines: climate and available land mass are the major determinants of phytogeographical patterns in the Sunda–Sahul Convergence Zone
Publisher: Oxford University Press (OUP)
Date: 17-12-2020
DOI: 10.1093/BIOLINNEAN/BLAA194
Abstract: The Miocene convergence of the Sunda shelf, Sahul shelf and Wallacea facilitated the exchange of previously isolated floras across the Sunda–Sahul Convergence Zone (SSCZ). The SSCZ is a hotspot of biogeographical research however, phytogeographical patterns across the region remain poorly understood. We conducted multivariate analysis on a comprehensive species checklist of SSCZ vascular plants to quantify the extent of exchange, characterize phytogeographical patterns and investigate their abiotic drivers. We found that Lydekker’s and Wallace’s Lines are not reflected in floristic composition at any taxonomic level, with 46% of genera distributed across these biogeographical lines. In contrast, environment is significantly correlated with floristic composition, with annual rainfall and seasonality being the strongest correlates. Mainland Asia, Borneo, the Philippines, New Guinea and Australia were major routes of exchange throughout the Cenozoic, possibly because these areas have been persistent landmasses throughout the entire period of convergence. We conclude that Sunda–Sahul floristic exchange has substantially influenced the assembly of the regional flora and that modern phytogeographical patterns have been influenced more by environmental variables and available landmass (i.e. establishment conditions) than by putative barriers to movement such as Wallace’s and Lydekker’s Lines (i.e. vagility).
Molecular phylogeography reveals two geographically and temporally separated floristic exchange tracks between Southeast Asia and northern Australia
Publisher: Wiley
Date: 28-02-2021
DOI: 10.1111/JBI.14072
A Sub-Neptune-sized Planet Transiting the M2.5 Dwarf G 9-40: Validation with the Habitable-zone Planet Finder
Publisher: American Astronomical Society
Date: 12-02-2020
High-resolution Near-infrared Spectroscopy of a Flare around the Ultracool Dwarf vB 10
Publisher: American Astronomical Society
Date: 02-2022
Abstract: We present high-resolution observations of a flaring event in the M8 dwarf vB 10 using the near-infrared Habitable-zone Planet Finder (HPF) spectrograph on the Hobby-Eberly Telescope. The high stability of HPF enables us to accurately subtract a vB 10 quiescent spectrum from the flare spectrum to isolate the flare contributions and study the changes in the relative energy of the Ca ii infrared triplet, several Paschen lines, the He λ 10830 triplet lines, and to select iron and magnesium lines in HPF's bandpass. Our analysis reveals the presence of a red asymmetry in the He λ 10830 triplet, which is similar to signatures of coronal rain in the Sun. Photometry of the flare derived from an acquisition camera before spectroscopic observations and the ability to extract spectra from up-the-r observations with the HPF infrared detector enable us to perform time-series analysis of part of the flare and provide coarse constraints on the energy and frequency of such flares. We compare this flare with historical observations of flares around vB 10 and other ultracool M dwarfs and attempt to place limits on flare-induced atmospheric mass loss for hypothetical planets around vB 10.
Taxonomic resolution of the Tetratheca hirsuta (Elaeocarpaceae) species complex using an integrative approach
Publisher: CSIRO Publishing
Date: 2017
DOI: 10.1071/SB16040
Abstract: The Tetratheca hirsuta Lindl. species complex from south-west Western Australia is one of the last unresolved complexes in this Australian endemic genus, and comprises the highly variable T. hirsuta, two rare, phrase-named taxa, and the closely allied T. hispidissima Steetz. An integrative approach, incorporating multivariate morphometric analysis and molecular phylogenetic and phenetic analyses of nrDNA (ETS) and cpDNA (ndhF–trnL, rpl16, trnS–trnG5ʹ2S), was used to investigate taxonomic boundaries within the complex. Morphological data showed clear ergence within the complex, and allowed several taxonomically uncertain in iduals to be assigned. Phenetic and phylogenetic analyses of ETS showed substantial congruence with morphology, indicating that the groups recognised through morphometric analyses are also genetically ergent. By comparison, the chloroplast regions yielded incongruent gene trees, perhaps owing to incomplete lineage sorting, hybridisation or slow evolution of cpDNA. The present results support the recognition of the following four taxa: a morphologically and geographically expanded T. hispidissima, which is highly ergent from the remainder of the complex, and a closer grouping of T. hirsuta subsp. boonanarring Joyce & R.Butcher subsp. nov., T. hirsuta subsp. viminea (Lindl.) Joyce comb. et stat. nov. and T. hirsuta subsp. hirsuta.
Genotyping-by-Sequencing in a Species Complex of Australian Hummock Grasses (Triodia): Methodological Insights and Phylogenetic Resolution
Publisher: Public Library of Science (PLoS)
Date: 30-01-2017
An In-depth Look at TOI-3884b: A Super-Neptune Transiting an M4Dwarf with Persistent Starspot Crossings
Publisher: American Astronomical Society
Date: 24-05-2023
Abstract: We perform an in-depth analysis of the recently validated TOI-3884 system, an M4-dwarf star with a transiting super-Neptune. Using high-precision light curves obtained with the 3.5 m Apache Point Observatory and radial velocity observations with the Habitable-zone Planet Finder, we derive a planetary mass of 32.6 − 7.4 + 7.3 M ⊕ and radius of 6.4 ± 0.2 R ⊕ . We detect a distinct starspot crossing event occurring just after ingress and spanning half the transit for every transit. We determine this spot feature to be wavelength dependent with the litude and duration evolving slightly over time. Best-fit starspot models show that TOI-3884b possesses a misaligned ( λ = 75° ± 10°) orbit that crosses a giant pole spot. This system presents a rare opportunity for studies into the nature of both a misaligned super-Neptune and spot evolution on an active mid-M dwarf.
A new pollination system in non-cleistogamous species of Viola results from nyctinastic (night-closing) petal movements – A mixed outcrossing-selfing strategy
Publisher: Elsevier BV
Date: 04-2019
Design of NEID, an extreme precision Doppler spectrograph for WIYN
Publisher: SPIE
Date: 09-08-2016
DOI: 10.1117/12.2234411
Ultra-stable temperature and pressure control for the Habitable-zone Planet Finder spectrograph
Publisher: SPIE
Date: 09-08-2016
DOI: 10.1117/12.2233443
Of a different feather
Publisher: CSIRO Publishing
Date: 08-05-2019
DOI: 10.1071/SB18065
Abstract: Ptilotus macrocephalus (R.Br.) Poir. (Amaranthaceae), commonly known as a featherhead, is a widespread and common species in many parts of Australia. In the present study, we assess morphological variation in P. macrocephalus throughout its geographic range and provide evidence for the recognition of two new species, namely, P. psilorhachis T.Hammer & R.W.Davis and P. xerophilus T.Hammer & R.W.Davis. Geospatial analyses indicated that these new species are partitioned ecologically and geographically.
A revision of the Triodia basedowii species complex and close relatives (Poaceae: Chloridoideae)
Publisher: CSIRO Publishing
Date: 2017
DOI: 10.1071/SB17011
Abstract: Perennial grasses commonly known as ‘spinifex’ (Triodia R.Br.) are iconic Australian plants, predominantly found in the arid interior of the continent. In some areas, such as the economically important Pilbara region of Western Australia, current species taxonomy does not account for observed ersity. Previous morphological and molecular studies of Triodia basedowii E.Pritz. and related species have revealed multiple unnamed lineages requiring taxonomic recognition. Here, we describe and name eight new species of Triodia, including T. birriliburu B.M.Anderson, T. chichesterensis B.M.Anderson, T. glabra B.M.Anderson & M.D.Barrett, T. infesta B.M.Anderson & M.D.Barrett, T. mallota B.M.Anderson & M.D.Barrett, T. nana B.M.Anderson, T. scintillans B.M.Anderson & M.D.Barrett, and T. vanleeuwenii B.M.Anderson & M.D.Barrett. We also provide recircumscriptions and revised descriptions for T. basedowii, T. lanigera Domin, T. concinna N.T.Burb. and T. plurinervata N.T.Burb. A key to species and photographs are included.
Ultrastable environment control for the NEID spectrometer: design and performance demonstration
Publisher: SPIE-Intl Soc Optical Eng
Date: 23-03-2019
A microresonator-based etalon for visible light precision radial velocity measurements
Publisher: SPIE
Date: 13-12-2020
DOI: 10.1117/12.2562369
A revision of the Calytrix acutifolia complex (Myrtaceae: Chamelaucieae)
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 26-10-2017
DOI: 10.58828/NUY00847
Two new species of Hibbertia (Dilleniaceae) from near Ravensthorpe in Western Australia
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 17-12-2009
DOI: 10.58828/NUY00569
Teucrium disjunctum, a new name for Spartothamnella canescens (Lamiaceae)
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 12-04-2017
DOI: 10.58828/NUY00841
Introducing the Australian Journal of Taxonomy, a new, fully-online, fully open-access journal for the rapid publication of new Australian species and other taxa
Publisher: Atlas of Living Australia
Date: 11-05-2022
DOI: 10.54102/AJT.QXI3R
Abstract: With this paper we introduce the Australian Journal of Taxonomy and outline its scope, rationale, workflow and governance. The journal is published by Taxonomy Australia, a national collaboration by the Australian taxonomic community. Australian Journal of Taxonomy is one of the world's first fully-online journals. Papers are born-digital and born-online: they are authored on the Australian Journal of Taxonomy online platform, and all subsequent steps (peer-review, editing, copy editing and publication) take place on that platform. At no stage does a paper in Australian Journal of Taxonomy need to exist as a document in a word-processing application. This fully-online processing substantially eases and accelerates workflows, and reduces the costs of production and publishing to a minimum. For these reasons, Australian Journal of Taxonomy is also diamond open access, with no access charges for either authors or readers. Australian Journal of Taxonomy is optimised for the rapid publication of new Australian taxa across all eukaryotic organismal groups (animals, fungi, plants etc.), and is part of the overarching strategy of Taxonomy Australia to substantially accelerate the discovery and taxonomic documentation of Australia's bio ersity.
A High-Eccentricity Warm Jupiter Orbiting TOI-4127
Publisher: American Astronomical Society
Date: 10-05-2023
Abstract: We report the discovery of TOI-4127 b, which is a transiting, Jupiter-sized exoplanet on a long-period ( P = 56.39879 − 0.00010 + 0.00010 days) and a high-eccentricity orbit around a late F-type dwarf star. This warm Jupiter was first detected and identified as a promising candidate from a search for single-transit signals in TESS Sector 20 data, and was later characterized as a planet following two subsequent transits (TESS Sectors 26 and 53) and follow-up ground-based RV observations with the NEID and SOPHIE spectrographs. We jointly fit the transit and RV data to constrain the physical ( R p = 1.096 − 0.032 + 0.039 R J , M p = 2.30 − 0.11 + 0.11 M J ) and orbital parameters of the exoplanet. Given its high orbital eccentricity ( e = 0.7471 − 0.0086 + 0.0078 ), TOI-4127 b is a compelling candidate for studies of warm Jupiter populations and of hot Jupiter formation pathways. We show that the present periastron separation of TOI-4127 b is too large for high-eccentricity tidal migration to circularize its orbit, and that TOI-4127 b is unlikely to be a hot Jupiter progenitor unless it is undergoing angular momentum exchange with an undetected outer companion. Although we find no evidence for an external companion, the available observational data are insufficient to rule out the presence of a perturber that can excite eccentricity oscillations and facilitate tidal migration.
Towards a global list of accepted species I. Why taxonomists sometimes disagree, and why this matters
Publisher: Springer Science and Business Media LLC
Date: 13-07-2021
The showy and the shy: reinstatement of two species from Ptilotus gaudichaudii (Amaranthaceae)
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/SB17026
Abstract: Ptilotus R.Br. (Amaranthaceae) is a widespread and species-rich Australian genus. One of the most common arid species, Ptilotus gaudichaudii (Steud.) J.M.Black (paper foxtail), currently comprises the following three subspecies: subsp. gaudichaudii, subsp. eremita (S.Moore) Lally and subsp. parviflorus (Benth.) Lally. In the present study, we re-evaluate the morphological basis for the recognition and status of infraspecies in P. gaudichaudii. Evidence from herbarium and field observations supports the reinstatement of Ptilotus gaudichaudii subsp. eremita and subsp. parviflorus to the rank of species as P. eremita (S.Moore) T.Hammer & R.W.Davis and P. modestus T.Hammer respectively.
The NEID precision radial velocity spectrometer: port adapter overview, requirements, and test plan
Publisher: SPIE
Date: 27-07-2018
DOI: 10.1117/12.2312209
A Warm Jupiter Transiting an M Dwarf: A TESS Single-transit Event Confirmed with the Habitable-zone Planet Finder
Publisher: American Astronomical Society
Date: 02-09-2020
Adaptive optics fed single-mode spectrograph for high-precision Doppler measurements in the near-infrared
Publisher: SPIE
Date: 22-07-2016
DOI: 10.1117/12.2234407
Phylogenomics and continental biogeographic disjunctions: insight from the Australian starflowers (Calytrix).
Publisher: Wiley
Date: 02-2022
DOI: 10.1002/AJB2.1790
Abstract: Continental-scale disjunctions and associated drivers are core research interests in biogeographic studies. Here, we selected a species-rich Australian plant genus (Calytrix Myrtaceae) as a case study to investigate these patterns. Species of this endemic Australian starflower genus have a disjunct distribution across the mesic fringes of the continent and are largely absent from the arid center. We used high-throughput sequencing to generate unprecedented resolution and near complete species-level nuclear and plastid phylogenies for Calytrix. BioGeoBEARS and biogeographic stochastic mapping were used to infer ancestral areas, the relative contributions of vicariance and dispersal events, and directionality of dispersal. Present-day disjunctions in Calytrix are explained by a combination of scenarios: (1) retreat of multiple lineages from the continental center to the more mesic fringes as Australia became progressively more arid, with subsequent extinction in the center as well as (2) origination of ancestral lineages in southwestern Australia (SWA) for species-rich clades. The SWA bio ersity hotspot is a major ersification center and the most common source area of dispersals, with multiple lineages originating in SWA and subsequently spreading to the adjacent arid Eremaean region. Our results suggest that major extinction, as a result of cooling and drying of the Australian continent in the Eocene-Miocene, shaped the present-day biogeography of Calytrix. We hypothesize that this peripheral vicariance pattern, which is similar to the African Rand flora, may explain the disjunctions of many other Australian plant groups. Further studies with densely s led phylogenies are required to test this hypothesis.
A Harsh Test of Far-field Scrambling with the Habitable-zone Planet Finder and the Hobby–Eberly Telescope
Publisher: American Astronomical Society
Date: 30-04-2021
Abstract: The Habitable-zone Planet Finder (HPF) is a fiber-fed precise radial velocity (RV) spectrograph at the 10 m Hobby–Eberly Telescope (HET). Due to its fixed-altitude design, the HET pupil changes appreciably across a track, leading to significant changes of the fiber far-field illumination. HPF’s fiber scrambler is designed to suppress the impact of these illumination changes on the RVs—but the residual impact on the RV measurements has yet to be probed on-sky. We use GJ 411, a bright early type (M2) M dwarf to probe the effects of far-field input trends due to these pupil variations on HPF RVs. These large changes (∼2x) in the pupil area and centroid present a harsh test of HPF’s far-field scrambling. Our results show that the RVs are effectively decoupled from these extreme far-field input changes due to pupil centroid offsets, attesting to the effectiveness of the scrambler design. This experiment allows us to test the impact of these changes with large pupil variation on-sky, something we would not easily be able to do at a conventional optical telescope. While the pupil and illumination changes expected at these other telescopes are small, scaling from our results enables us to estimate and bound these effects, and show that they are controllable even for the new and next generation of RV instruments in their quest to beat down instrumental noise sources toward the goal of a few cm s − 1 .
TOI-1728b: The Habitable-zone Planet Finder Confirms a Warm Super-Neptune Orbiting an M-dwarf Host
Publisher: American Astronomical Society
Date: 10-08-2020
Acacia armigera (Fabaceae), a new, geographically restricted wattle from the Coolgardie bioregion of Western Australia
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 27-04-2023
DOI: 10.58828/NUY01048
Recombinations in Western Australian Orchidaceae 1
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 23-11-2007
DOI: 10.58828/NUY00475
Management legacies shape decadal-scale responses of plant diversity to experimental disturbance regimes in fragmented grassy woodlands
Publisher: Wiley
Date: 06-03-2013
Rubidium transitions as wavelength reference for astronomical Doppler spectrographs
Publisher: SPIE
Date: 03-01-2020
DOI: 10.1117/12.2541317
Untangling a species complex of arid zone grasses (Triodia) reveals patterns congruent with co-occurring animals
Publisher: Elsevier BV
Date: 08-2016
DOI: 10.1016/J.YMPEV.2016.05.014
Abstract: The vast Australian arid zone formed over the last 15million years, and gradual aridification as well as more extreme Pliocene and Pleistocene climate shifts have impacted the evolution of its biota. Understanding the evolutionary history of groups of organisms or regional biotas such as the Australian arid biota requires clear delimitation of the units of bio ersity (taxa). Here we integrate evidence from nuclear (ETS and ITS) and chloroplast (rps16-trnK spacer) regions and morphology to clarify taxonomic boundaries in a species complex of Australian hummock grasses (Triodia) to better understand the evolution of Australian arid zone plants and to evaluate congruence in distribution patterns with co-occurring organisms. We find evidence for multiple new taxa in the T. basedowii species complex, but also incongruence between data sets and indications of hybridization that complicate delimitation. We find that the T. basedowii complex has high lineage ersity and endemism in the biologically important Pilbara region of Western Australia, consistent with the region acting as a refugium. Taxa show strong geographic structure in the Pilbara, congruent with recent work on co-occurring animals and suggesting common evolutionary drivers across the biota. Our findings confirm recognition of the Pilbara as an important centre of bio ersity in the Australian arid zone, and provide a basis for future taxonomic revision of the T. basedowii complex and more detailed study of its evolutionary history and that of arid Australia.
Hibbertia subvillosa (Dilleniaceae), a new Western Australian species segregated from H. striata
Publisher: Atlas of Living Australia
Date: 25-09-2022
DOI: 10.54102/AJT.945NM
Abstract: The south-west Western Australian species Hibbertia striata (Steud.) K.R.Thiele was reinstated in 2017, segregated from the historically misunderstood H. huegelii (Endl.) F.Muell. Since that time, field work has shown that H. striata comprises two distinctly different morphotypes. Plants from the eastern (drier) edge of the range are consistently single-stemmed at the base and are obligate reseeders after fire and other disturbances, in contrast to a more widespread morphotype (which includes the type of H. striata), that is abundantly multi-stemmed from the base and is a resprouter after fire. The difference in habit is consistent, has been observed at multiple locations and is consistently associated with distinct (though subtle) differences in leaf indumentum and morphology. The two morphotypes have not been found growing in mixed populations, due to habitat differences. Field work has shown that they are narrowly sympatric and do not intergrade where they approach each other for this reason, and the consistency of both morphotypes over a wide range, they are regarded here as distinct species. The reseeding taxon has a validly published name, H. huegelii (Endl.) F.Muell. var. subvillosa Domin, and this is raised here to species rank as Hibbertia subvillosa (Domin) K.R.Thiele & T.Hammer.
GJ 3929: High-precision Photometric and Doppler Characterization of an Exo-Venus and Its Hot, Mini-Neptune-mass Companion
Publisher: American Astronomical Society
Date: 30-08-2022
Abstract: We detail the follow-up and characterization of a transiting exo-Venus identified by TESS, GJ 3929b (TOI-2013b), and its nontransiting companion planet, GJ 3929c (TOI-2013c). GJ 3929b is an Earth-sized exoplanet in its star’s Venus zone ( P b = 2.616272 ± 0.000005 days S b = 17.3 − 0.7 + 0.8 S ⊕ ) orbiting a nearby M dwarf. GJ 3929c is most likely a nontransiting sub-Neptune. Using the new, ultraprecise NEID spectrometer on the WIYN 3.5 m Telescope at Kitt Peak National Observatory, we are able to modify the mass constraints of planet b reported in previous works and consequently improve the significance of the mass measurement to almost 4 σ confidence ( M b = 1.75 ± 0.45 M ⊕ ). We further adjust the orbital period of planet c from its alias at 14.30 ± 0.03 days to the likely true period of 15.04 ± 0.03 days, and we adjust its minimum mass to m sin i = 5.71 ± 0.92 M ⊕ . Using the diffuser-assisted ARCTIC imager on the ARC 3.5 m telescope at Apache Point Observatory, in addition to publicly available TESS and LCOGT photometry, we are able to constrain the radius of planet b to R p = 1.09 ± 0.04 R ⊕ . GJ 3929b is a top candidate for transmission spectroscopy in its size regime (TSM = 14 ± 4), and future atmospheric studies of GJ 3929b stand to shed light on the nature of small planets orbiting M dwarfs.
Keck Planet Finder: preliminary design
Publisher: SPIE
Date: 06-07-2018
DOI: 10.1117/12.2311565
A VERSATILE TECHNIQUE TO ENABLE SUB-MILLI-KELVIN INSTRUMENT STABILITY FOR PRECISE RADIAL VELOCITY MEASUREMENTS: TESTS WITH THE HABITABLE-ZONE PLANET FINDER
Publisher: American Astronomical Society
Date: 16-12-2016
Solar Contamination in Extreme-precision Radial-velocity Measurements: Deleterious Effects and Prospects for Mitigation
Publisher: American Astronomical Society
Date: 18-03-2020
Phylogenomic analyses of Sapindales support new family relationships, rapid Mid-Cretaceous Hothouse diversification, and heterogeneous histories of gene duplication
Publisher: Frontiers Media SA
Date: 07-03-2023
DOI: 10.3389/FPLS.2023.1063174
Abstract: Sapindales is an angiosperm order of high economic and ecological value comprising nine families, c. 479 genera, and c. 6570 species. However, family and subfamily relationships in Sapindales remain unclear, making reconstruction of the order’s spatio-temporal and morphological evolution difficult. In this study, we used Angiosperms353 target capture data to generate the most densely s led phylogenetic trees of Sapindales to date, with 448 s les and c. 85% of genera represented. The percentage of paralogous loci and allele ergence was characterized across the phylogeny, which was time-calibrated using 29 rigorously assessed fossil calibrations. All families were supported as monophyletic. Two core family clades sub ide the order, the first comprising Kirkiaceae, Burseraceae, and Anacardiaceae, the second comprising Simaroubaceae, Meliaceae, and Rutaceae. Kirkiaceae is sister to Burseraceae and Anacardiaceae, and, contrary to current understanding, Simaroubaceae is sister to Meliaceae and Rutaceae. Sapindaceae is placed with Nitrariaceae and Biebersteiniaceae as sister to the core Sapindales families, but the relationships between these families remain unclear, likely due to their rapid and ancient ersification. Sapindales families emerged in rapid succession, coincident with the climatic change of the Mid-Cretaceous Hothouse event. Subfamily and tribal relationships within the major families need revision, particularly in Sapindaceae, Rutaceae and Meliaceae. Much of the difficulty in reconstructing relationships at this level may be caused by the prevalence of paralogous loci, particularly in Meliaceae and Rutaceae, that are likely indicative of ancient gene duplication events such as hybridization and polyploidization playing a role in the evolutionary history of these families. This study provides key insights into factors that may affect phylogenetic reconstructions in Sapindales across multiple scales, and provides a state-of-the-art phylogenetic framework for further research.
A Mini-Neptune and a Radius Valley Planet Orbiting the Nearby M2 Dwarf TOI-1266 in Its Venus Zone: Validation with the Habitable-zone Planet Finder
Publisher: American Astronomical Society
Date: 13-11-2020
Cyanthillium gracilis, a new combination for the Western Australian endemic Pleurocarpaea gracilis (Asteraceae: Vernonieae)
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 13-12-2018
DOI: 10.58828/NUY00900
Recent range expansion in Australian hummock grasses (Triodia) inferred using genotyping-by-sequencing
Publisher: Oxford University Press (OUP)
Date: 03-2019
TOI-824 b: A New Planet on the Lower Edge of the Hot Neptune Desert
Publisher: American Astronomical Society
Date: 04-09-2020
TOI-3757 b: A Low-density Gas Giant Orbiting a Solar-metallicity M Dwarf
Publisher: American Astronomical Society
Date: 05-08-2022
Abstract: We present the discovery of a new Jovian-sized planet, TOI-3757 b, the lowest-density transiting planet known to orbit an M dwarf (M0V). This planet was discovered around a solar-metallicity M dwarf, using Transiting Exoplanet Survey Satellite photometry and confirmed with precise radial velocities from the Habitable-zone Planet Finder (HPF) and NEID. With a planetary radius of 12.0 − 0.5 + 0.4 R ⊕ and mass of 85.3 − 8.7 + 8.8 M ⊕ , not only does this object add to the small s le of gas giants (∼10) around M dwarfs, but also its low density ( ρ = 0.27 − 0.04 + 0.05 g cm −3 ) provides an opportunity to test theories of planet formation. We present two hypotheses to explain its low density first, we posit that the low metallicity of its stellar host (∼0.3 dex lower than the median metallicity of M dwarfs hosting gas giants) could have played a role in the delayed formation of a solid core massive enough to initiate runaway accretion. Second, using the eccentricity estimate of 0.14 ± 0.06, we determine it is also plausible for tidal heating to at least partially be responsible for inflating the radius of TOI-3757b b. The low density and large scale height of TOI-3757 b makes it an excellent target for transmission spectroscopy studies of atmospheric escape and composition (transmission spectroscopy measurement of ∼ 190). We use HPF to perform transmission spectroscopy of TOI-3757 b using the helium 10830 Å line. Doing this, we place an upper limit of 6.9% (with 90% confidence) on the maximum depth of the absorption from the metastable transition of He at ∼10830 Å, which can help constraint the atmospheric mass-loss rate in this energy-limited regime.
Calytrix calingiri, a new species from the Calytrix acutifolia species group (Myrtaceae: Chamelaucieae)
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 17-08-2022
DOI: 10.58828/NUY01037
Comprehensive characteristics and genetic diversity of the endemic Australian Viola banksii (section Erpetion, Violaceae)
Publisher: CSIRO Publishing
Date: 2019
DOI: 10.1071/BT18233
Abstract: Viola banksii, the type species of section Erpetion, is endemic in eastern mainland Australia. In this paper we characterise morphological and anatomical features and assess genome size and genetic ersity in combination with the breeding system. V. banksii develops exclusively chasmogamous flowers. Ovules are anatropous, crassinucellate and bitegmic, the female gametophyte is of the Polygonum type, and the embryo is of Asterad type surrounded by nuclear endosperm. Pollen is non-heteromorphic, 3-aperturate, and highly viable. V. banksii grows in shade on moist, well drained, often sandy soils, and this is reflected in the anatomy of its organs, which includes a lack of subepidermal collenchyma in aerial parts, large leaf epidermal cells with thin cell walls, a narrow cuticle layer, and vascular bundles with xylem that are not rich in vessels. V. banksii is tolerant to zinc and lead based on phytotoxicity test. The high chromosome number (2n = 10x = 50) does not correspond to a small genome size (2C DNA = 1.27 pg). Low mean intra-populational gene ersity (HS = 0.077) detected by ISSR markers confirms the strong influence of selfing and clonal propagation by pseudostolons. Unique morphological traits of V. banksii include nyctinastic petal movement, the lack of a floral spur, the presence of gland-like protuberances on two stamens, and the presence of pseudostolons, which could be a synapomorphy for the whole section.
Blackallia, Serichonus and Papistylus: three closely related genera of Rhamnaceae (Pomaderreae) from south-western Australia
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 23-11-2007
DOI: 10.58828/NUY00461
Three new Western Australian species related to Calytrix violacea (Myrtaceae: Chamelaucieae)
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 17-08-2022
DOI: 10.58828/NUY01034
An investigation of taxon boundaries in rare and range-restricted Synaphea (Proteaceae: Conosperminae) species from south-west Western Australia
Publisher: CSIRO Publishing
Date: 2014
DOI: 10.1071/SB14015
Abstract: The Swan Coastal Plain of south-west Western Australia has been extensively cleared since European settlement, with the fertile Pinjarra Plain land system preferentially cleared for grazing what remains of the native vegetation is of high conservation value despite being highly fragmented and often degraded. The following six taxa of Synaphea R.Br. (Proteaceae), with conservation status corresponding to IUCN Red List categories Threatened and Data Deficient, are restricted to vegetation remnants in this region: S. stenoloba A.S.George, S. odocoileops A.S.George, S. sp. Pinjarra (R. Davis 6578), S. sp. Fairbridge Farm (D. Papenfus 696), S. sp. Pinjarra Plain (A.S. George 17182) and S. sp. Serpentine (G.R. Brand 103). Taxonomic boundaries among these morphologically similar taxa of Synaphea were investigated using morphometric analyses based on characters of leaves, inflorescences, flowers and fruits. Results allow the circumscription of the four informally named taxa from this complex, which will enable their formal description in a subsequent publication. They also provide support for several morphologically closely related taxa, including the provisional distinction of S. sp. Udumung (A.S. George 17058) from close ally S. decorticans Lindl. Two described species (S. odocoileops and S. stenoloba) and several anomalous specimens could not be adequately resolved in these analyses, and further investigation of their boundaries using molecular markers is required.
Darwinia chantiae (Myrtaceae), a new species from Western Australia
Publisher: Atlas of Living Australia
Date: 16-03-2023
DOI: 10.54102/AJT.L1Q3H
Abstract: The new species Darwinia chantiae K.R.Thiele & R.W.Davis (Myrtaceae: Chamelaucieae: Chamelauciinae), endemic in southwest Western Australia where it is restricted to a small area between Morawa and Mullewa in the northern Avon Wheatbelt, is described, illustrated, and compared with the related D. sphaerica R.W.Davis & Rye and D. purpurea (Endl.) Benth.
Hibbertia glaucophylla is the correct name for the Western Australian species currently known as H. rupicola (Dilleniaceae)
Publisher: Atlas of Living Australia
Date: 12-02-2023
DOI: 10.54102/AJT.ZUMNQ
Abstract: There has been historical confusion and error in the application and typification of the name Pleurandra glaucophylla Steud., likely caused by a slip of the pen on the original collecting label which caused the collecting number assigned by Preiss (2179) to be mis-transcribed as 2159, a number already used for another Preiss collection. We show that the type of P. glaucophylla falls within the circumscription of the species currently known as Hibbertia rupicola (S.Moore) C.A.Gardner, necessitating the new combination H. glaucophylla (Steud.) K.R.Thiele & T.Hammer as the correct name for the species currently known as H. rupicola.
A Super-Earth and Sub-Neptune Transiting the Late-type M Dwarf LP 791-18
Publisher: American Astronomical Society
Date: 19-09-2019
Abstract: Planets occur most frequently around cool dwarfs, but only a handful of specific ex les are known to orbit the latest-type M stars. Using TESS photometry, we report the discovery of two planets transiting the low-mass star called LP 791-18 (identified by TESS as TOI 736). This star has spectral type M6V, effective temperature 2960 K, and radius 0.17 R ⊙ , making it the third-coolest star known to host planets. The two planets straddle the radius gap seen for smaller exoplanets they include a 1.1 R ⊕ planet on a 0.95 day orbit and a 2.3 R ⊕ planet on a 5 day orbit. Because the host star is small the decrease in light during these planets’ transits is fairly large (0.4% and 1.7%). This has allowed us to detect both planets’ transits from ground-based photometry, refining their radii and orbital ephemerides. In the future, radial velocity observations and transmission spectroscopy can both probe these planets’ bulk interior and atmospheric compositions, and additional photometric monitoring would be sensitive to even smaller transiting planets.
Viola silicestris, a new species in Viola section Erpetion from Australia.
Publisher: Royal Botanical Gardens and Domain Trust
Date: 27-04-2006
Evidence for He i 10830 Å Absorption during the Transit of a Warm Neptune around the M-dwarf GJ 3470 with the Habitable-zone Planet Finder
Publisher: American Astronomical Society
Date: 11-05-2020
TOI-3984 A b and TOI-5293 A b: Two Temperate Gas Giants Transiting Mid-M Dwarfs in Wide Binary Systems
Publisher: American Astronomical Society
Date: 27-06-2023
Abstract: We confirm the planetary nature of two gas giants discovered by TESS to transit M dwarfs with stellar companions at wide separations. TOI-3984 A ( J = 11.93) is an M4 dwarf hosting a short-period (4.353326 ± 0.000005 days) gas giant ( M p = 0.14 ± 0.03 M J and R p = 0.71 ± 0.02 R J ) with a wide-separation white dwarf companion. TOI-5293 A ( J = 12.47) is an M3 dwarf hosting a short-period (2.930289 ± 0.000004 days) gas giant ( M p = 0.54 ± 0.07 M J and R p = 1.06 ± 0.04 R J ) with a wide-separation M dwarf companion. We characterize both systems using a combination of ground- and space-based photometry, speckle imaging, and high-precision radial velocities from the Habitable-zone Planet Finder and NEID spectrographs. TOI-3984 A b ( T eq = 563 ± 15 K and TSM = 138 − 27 + 29 ) and TOI-5293 A b ( T eq = 675 − 30 + 42 K and TSM = 92 ± 14) are two of the coolest gas giants among the population of hot Jupiter–sized gas planets orbiting M dwarfs and are favorable targets for atmospheric characterization of temperate gas giants and 3D obliquity measurements to probe system architecture and migration scenarios.
A comprehensive radial velocity error budget for next generation Doppler spectrometers
Publisher: SPIE
Date: 09-08-2016
DOI: 10.1117/12.2232761
Large scale genome skimming from herbarium material for accurate plant identification and phylogenomics
Publisher: Springer Science and Business Media LLC
Date: 04-01-2020
DOI: 10.1186/S13007-019-0534-5
Abstract: Herbaria are valuable sources of extensive curated plant material that are now accessible to genetic studies because of advances in high-throughput, next-generation sequencing methods. As an applied assessment of large-scale recovery of plastid and ribosomal genome sequences from herbarium material for plant identification and phylogenomics, we sequenced 672 s les covering 21 families, 142 genera and 530 named and proposed named species. We explored the impact of parameters such as s le age, DNA concentration and quality, read depth and fragment length on plastid assembly error. We also tested the efficacy of DNA sequence information for identifying plant s les using 45 specimens recently collected in the Pilbara. Genome skimming was effective at producing genomic information at large scale. Substantial sequence information on the chloroplast genome was obtained from 96.1% of s les, and complete or near-complete sequences of the nuclear ribosomal RNA gene repeat were obtained from 93.3% of s les. We were able to extract sequences for the core DNA barcode regions rbcL and matK from 96 to 93.3% of s les, respectively. Read quality and DNA fragment length had significant effects on sequencing outcomes and error correction of reads proved essential. Assembly problems were specific to certain taxa with low GC and high repeat content ( Goodenia , Scaevola , Cyperus , Bulbostylis , Fimbristylis ) suggesting biological rather than technical explanations. The structure of related genomes was needed to guide the assembly of repeats that exceeded the read length. DNA-based matching proved highly effective and showed that the efficacy for species identification declined in the order cpDNA rDNA matK rbcL. We showed that a large-scale approach to genome sequencing using herbarium specimens produces high-quality complete cpDNA and rDNA sequences as a source of data for DNA barcoding and phylogenomics.
Resolving intergeneric relationships in the aervoid clade and the backbone of Ptilotus (Amaranthaceae): Evidence from whole plastid genomes and morphology
Publisher: Wiley
Date: 04-2019
DOI: 10.1002/TAX.12054
Towards a global list of accepted species II. Consequences of inadequate taxonomic list governance
Publisher: Springer Science and Business Media LLC
Date: 14-10-2021
A system to provide sub-milliKelvin temperature control at T~300K for extreme precision optical radial velocimetry
Publisher: SPIE
Date: 13-09-2016
DOI: 10.1117/12.2231311
MARVEL, a four-telescope array for high-precision radial-velocity monitoring
Publisher: SPIE
Date: 13-12-2020
DOI: 10.1117/12.2560895
The instrument control software package for the Habitable-Zone Planet Finder spectrometer
Publisher: SPIE
Date: 08-08-2016
DOI: 10.1117/12.2233011
Towards a global list of accepted species V. The devil is in the detail
Publisher: Springer Science and Business Media LLC
Date: 22-10-2021
The NEID spectrometer: fibre injection system design
Publisher: SPIE
Date: 13-12-2020
DOI: 10.1117/12.2563248
Taxonomists have an opportunity to rid botanical nomenclature of inappropriate honorifics in a structured and defensible way
Publisher: Wiley
Date: 18-10-2022
DOI: 10.1002/TAX.12821
Abstract: Recent proposals to amend the International Code of Nomenclature for algae, fungi, and plants (the Code ) to allow the rejection of names that honour historical in iduals who committed crimes against humanity has sparked a counter‐reaction that we believe misrepresents both the intent and mechanism of the proposals. In this short paper we point out errors and fallacious reasoning in this counter‐reaction, and again make the case that an open, balanced, modest, structured, and defensible way to deal with this issue is now, through sensible and reasonable proposals to amend the Code , within the grasp of the taxonomic and nomenclatural community. Adopting these proposals would represent a small but significant contribution to helping address some egregious historical wrongs.
A key to Ptilotus (Amaranthaceae) in Western Australia
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 13-12-2018
DOI: 10.58828/NUY00899
Detection of p-mode Oscillations in HD 35833 with NEID and TESS
Publisher: American Astronomical Society
Date: 16-11-2022
Abstract: We report the results of observations of p-mode oscillations in the G0 subgiant star HD 35833 in both radial velocities and photometry with NEID and TESS, respectively. We achieve separate, robust detections of the oscillation signal with both instruments (radial velocity litude A RV = 1.11 ± 0.09 m s −1 , photometric litude A phot = 6.42 ± 0.60 ppm, frequency of maximum power ν max = 595.71 ± 17.28 μ Hz, and mode spacing Δ ν = 36.65 ± 0.96 μ Hz) as well as a nondetection in a TESS sector concurrent with the NEID observations. These data shed light on our ability to mitigate the correlated noise impact of oscillations with radial velocities alone and on the robustness of commonly used asteroseismic scaling relations. The NEID data are used to validate models for the attenuation of oscillation signals for exposure times t ν max − 1 , and we compare our results to predictions from theoretical scaling relations and find that the observed litudes are weaker than expected by σ , hinting at gaps in the underlying physical models.
The NEID precision radial velocity spectrometer: optical design of the port adapter and ADC
Publisher: SPIE
Date: 09-07-2018
DOI: 10.1117/12.2314420
Persistent Starspot Signals on M Dwarfs: Multiwavelength Doppler Observations with the Habitable-zone Planet Finder and Keck/HIRES
Publisher: American Astronomical Society
Date: 09-07-2020
The Unusual M-dwarf Warm Jupiter TOI-1899 b: Refinement of Orbital and Planetary Parameters
Publisher: American Astronomical Society
Date: 03-08-2023
Abstract: TOI-1899 b is a rare exoplanet, a temperate warm Jupiter orbiting an M dwarf, first discovered by Cañas et al. (2020) from a TESS single-transit event. Using new radial velocities (RVs) from the precision RV spectrographs HPF and NEID, along with additional TESS photometry and ground-based transit follow-up, we are able to derive a much more precise orbital period of P = 29.090312 − 0.000035 + 0.000036 days, along with a radius of R p = 0.99 ± 0.03 R J . We have also improved the constraints on planet mass, M p = 0.67 ± 0.04 M J , and eccentricity, which is consistent with a circular orbit at 2 σ ( e = 0.044 − 0.027 + 0.029 ). TOI-1899 b occupies a unique region of parameter space as the coolest known ( T eq ≈ 380 K) Jovian-sized transiting planet around an M dwarf we show that it has great potential to provide clues regarding the formation and migration mechanisms of these rare gas giants through transmission spectroscopy with JWST, as well as studies of tidal evolution.
Towards a global list of accepted species VI: The Catalogue of Life checklist
Publisher: Springer Science and Business Media LLC
Date: 11-10-2021
Hibbertia sejuncta, a new, rare species from Western Australia, with notes on H. helianthemoides
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 16-03-2017
DOI: 10.58828/NUY00819
Report of the Special Committee on By‐laws for the Nomenclature Section
Publisher: Wiley
Date: 06-2016
DOI: 10.12705/653.42
Two new Western Australian species related to Hibbertia priceana (Dilleniaceae)
Publisher: Atlas of Living Australia
Date: 10-07-2023
DOI: 10.54102/AJT.CR6CH
Abstract: Hibbertia priceana is a rare species found in two localised areas in southern south-western Western Australia, near Ongerup and in the vicinity of Wickepin and Harrismith. Two new species that are morphologically similar to H. priceana but are disjunct and distinct from it are described in this paper. Hibbertia hapalophylla is a new, potentially geographically restricted and rare species first collected during botanical surveys for a mining project near Mount Holland in the Western Australian Goldfields. It was initially collected from, and only known from, disturbed areas on an active mine site, but larger populations were subsequently discovered on a nearby sandplain, from where is was likely introduced to the mine site on sand transported for construction purposes. The second new species, Hibbertia remanens, appears to be restricted to small areas of remnant vegetation near Cunderdin and Kellerberrin in the Western Australian wheatbelt. The three species differ mainly in their leaf shapes in section, with H. priceana having flat leaves with the abaxial lamina fully exposed, H. remanens having recurved leaf margins with the abaxial shallowly grooved either side of the midrib, and H. hapalophylla having strongly revolute margins with the abaxial lamina surface concealed within lacunae formed between the margins and midrib.
Historical biogeography of Pomaderris (Rhamnaceae): Continental vicariance in Australia and repeated independent dispersals to New Zealand
Publisher: Elsevier BV
Date: 05-2021
(286) Proposal to replace Division III of the International Code of Nomenclature for algae, fungi, and plants
Publisher: Wiley
Date: 06-2016
DOI: 10.12705/653.41
Further recombinations of Dryandra into Banksia
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 23-11-2007
DOI: 10.58828/NUY00523
CONSERVATION OF THE GRASSY WHITE BOX WOODLANDS - RELATIVE CONTRIBUTIONS OF SIZE AND DISTURBANCE TO FLORISTIC COMPOSITION AND DIVERSITY OF REMNANTS
Publisher: CSIRO Publishing
Date: 1995
DOI: 10.1071/BT9950349
Abstract: Before European settlement, grassy white box woodlands were the dominant vegetation in the east of the wheat-sheep belt of south-eastern Australia. Tree clearing, cultivation and pasture improvement have led to fragmentation of this once relatively continuous ecosystem, leaving a series of remnants which themselves have been modified by livestock grazing. Little-modified remnants are extremely rare. We examined and compared the effects of fragmentation and disturbance on the understorey flora of woodland remnants, through a survey of remnants of varying size, grazing history and tree clearing. In accordance with fragmentation theory, species richness generally increased with remnant size, and, for little-grazed remnants, smaller remnants were more vulnerable to weed invasion. Similarly, tree clearing and grazing encouraged weed invasion and reduced native species richness. Evidence for increased total species richness at intermediate grazing levels, as predicted by the intermediate disturbance hypothesis, was equivocal. Remnant quality was more severely affected by grazing than by remnant size. All little-grazed remnants had lower exotic species abundance and similar or higher native species richness than grazed remnants, despite their extremely small sizes ( 6 ha). Further, small, littlegrazed remnants maintained the general character of the pre-European woodland understorey, while grazing caused changes to the dominant species. Although generally small, the little-grazed remnants are the best representatives of the pre-European woodland understorey, and should be central to any conservation plan for the woodlands. Selected larger remnants are needed to complement these, however, to increase the total area of woodland conserved, and, because most little-grazed remnants are cleared, to represent the ecosystem in its original structural form. For the maintenance of native plant ersity and composition in little-grazed remnants, it is critical that livestock grazing continues to be excluded. For grazed remnants, maintenance of a site in its current state would allow continuation of past management, while restoration to a pre-European condition would require management directed towards weed removal, and could take advantage of the difference noted in the predominant life-cycle of native (perennial) versus exotic (annual or biennial) species.
This changes everything: dynamic floras and the disruption of traditional taxonomic practice
Publisher: CSIRO Publishing
Date: 2016
DOI: 10.1071/SB16016
Abstract: Flora writing has traditionally been an important but sporadic part of the taxonomic process. The gap between the completion of Bentham’s Flora australiensis and the commencement of the Flora of Australia project, for ex le, was 103 years. Floras are generally written by small teams (occasionally by single authors) based in single or coordinated networks of institutions, and function as authoritative, point-in-time syntheses of taxonomic activity during the years preceding their creation. Of course, since taxonomy is a dynamic and (potentially) open-ended science, it is often the case that as soon as a Flora treatment is published, it is rendered superseded by ongoing taxonomy. The traditional taxonomic process can, thus, be modelled as a cyclic alternation of open, unconstrained, more-or-less unmediated taxonomic activity (hypothesis generation) punctuated by short phases of synthesis, constraint and mediation (hypothesis consolidation). The opportunity to move from paper Flora publication to digital management and delivery of eFloras may substantially change this model. Although traditional Floras are understood to be unitary, authoritative, synthetic, sporadic and static, eFloras are expected to be unitary, authoritative, synthetic, continuous and dynamic. There is potential tension between the first three expectations of an eFlora (that it be unitary, authoritative and synthetic) and the last two (that it be continuous and dynamic). Resolving this tension may necessitate a change in the way taxonomy is conducted, mediated and managed the implications of such change will need to be carefully considered, and the change will need to be carefully managed, to make the most of the opportunities of eFloras, while retaining the values of an open, vigorous taxonomic science.
The Habitable Zone Planet Finder Reveals a High Mass and Low Obliquity for the Young Neptune K2-25b
Publisher: American Astronomical Society
Date: 30-09-2020
TOI-1859b: A 64 Day Warm Jupiter on an Eccentric and Misaligned Orbit
Publisher: American Astronomical Society
Date: 07-2023
Abstract: Warm Jupiters are close-in giant planets with relatively large planet–star separations (i.e., 10 a / R ⋆ 100). Given their weak tidal interactions with their host stars, measurements of stellar obliquity may be used to probe the initial obliquity distribution and dynamical history for close-in gas giants. Using spectroscopic observations, we confirm the planetary nature of TOI-1859b and determine the stellar obliquity of TOI-1859 to be λ = 38.9 − 2.7 + 2.8 ° relative to its planetary companion using the Rossiter–McLaughlin effect. TOI-1859b is a 64 day warm Jupiter orbiting around a late F dwarf and has an orbital eccentricity of 0.57 − 0.16 + 0.12 inferred purely from transit light curves. The eccentric and misaligned orbit of TOI-1859b is likely an outcome of dynamical interactions, such as planet–planet scattering and planet–disk resonance crossing.
A new subtribal classification of Myrtaceae tribe Chamelaucieae
Publisher: CSIRO Publishing
Date: 2020
DOI: 10.1071/SB19009
Abstract: A new classification of Myrtaceae tribe Chamelaucieae DC., derived from a molecular phylogenetic analysis based on nr ETS and cp trnK and atpB–rbcL spacer sequences, is presented. Eleven subtribes are recognised, eight of which are new. The currently accepted circumscriptions of subtribes Calytricinae Benth. and ‘Euchamelaucieae Benth.’ (nom. inval.) are retained, with the latter being formally published here as Chamelauciinae Rye & Peter G.Wilson. Subtribe Thryptomeninae Benth. is reduced in size by the creation of the new subtribes Alutinae Rye & Peter G.Wilson and Micromyrtinae Rye & Peter G.Wilson. Subtribe Baeckeinae Schauer is reduced to a single genus, with the excluded genera distributed in the new subtribes Astarteinae Rye & Peter G.Wilson, Hysterobaeckeinae Rye & Peter G.Wilson, Ochrospermatinae Rye & Peter G.Wilson, Rinziinae Rye & Peter G.Wilson and Stenostegiinae Rye & Peter G.Wilson. The history of recognition of the genera and subtribes of Chamelaucieae is outlined and supporting morphological evidence for the new classification discussed.
Rubidium traced etalon wavelength calibrators: towards deployment at observatories
Publisher: SPIE
Date: 09-07-2018
DOI: 10.1117/12.2314426
Target Prioritization and Observing Strategies for the NEID Earth Twin Survey
Publisher: American Astronomical Society
Date: 19-02-2021
Abstract: NEID is a high-resolution optical spectrograph on the WIYN 3.5 m telescope at Kitt Peak National Observatory and will soon join the new generation of extreme precision radial velocity instruments in operation around the world. We plan to use the instrument to conduct the NEID Earth Twin Survey (NETS) over the course of the next 5 years, collecting hundreds of observations of some of the nearest and brightest stars in an effort to probe the regime of Earth-mass exoplanets. Even if we take advantage of the extreme instrumental precision conferred by NEID, it will be difficult to disentangle the weak (∼10 cm s −1 ) signals induced by such low-mass, long-period exoplanets from stellar noise for all but the quietest host stars. In this work, we present a set of quantitative selection metrics which we use to identify an initial NETS target list consisting of stars conducive to the detection of exoplanets in the regime of interest. We also outline a set of observing strategies with which we aim to mitigate uncertainty contributions from intrinsic stellar variability and other sources of noise.
The noble and the exalted: a multidisciplinary approach to resolving a taxonomic controversy within Ptilotus (Amaranthaceae)
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/SB17062
Abstract: A molecular study on Ptilotus nobilis (Lindl.) F.Muell. var. nobilis and P. exaltatus Nees var. exaltatus led to the conclusion that these taxa are conspecific, resulting in the synonymisation of the latter under the former as P. nobilis subsp. nobilis. In this study, we test previous taxonomic concepts in the P. nobilis–P. exaltatus species group by examining (1) the morphology of specimens in the herbarium and field, and (2) ecological and geographic partitioning of two widespread and broadly sympatric taxa in the group, using Maxent and CART models. We provide strong evidence supporting the reinstatement of P. exaltatus as distinct from P. nobilis, on the basis of multiple morphological characters and strong ecological and geographic partitioning, the latter showing how large-scale ecological data can be used to help resolve taxonomic issues. In addition, we raise P. nobilis subsp. angustifolius (Benl) Lally & W.R.Barker to the rank of species as P. angustifolius (Benl) T.Hammer and reinstate P. semilanatus (Lindl.) F.Muell. ex J.M.Black.
Stable Fiber-illumination for Extremely Precise Radial Velocities with NEID
Publisher: American Astronomical Society
Date: 15-08-2023
Abstract: NEID is a high-resolution red–optical precision radial velocity (RV) spectrograph recently commissioned at the WIYN 3.5 m telescope at Kitt Peak National Observatory, Arizona, USA. NEID has an extremely stable environmental control system, and spans a wavelength range of 380–930 nm with two observing modes: a High Resolution mode at R ∼ 112,000 for maximum RV precision, and a High Efficiency mode at R ∼ 72,000 for faint targets. In this paper we present a detailed description of the components of NEID’s optical fiber feed, which include the instrument, exposure meter, calibration system, and telescope fibers. Many parts of the optical fiber feed can lead to uncalibratable RV errors, which cannot be corrected for using a stable wavelength reference source. We show how these errors directly cascade down to performance requirements on the fiber feed and the scrambling system. We detail the design, assembly, and testing of each component. Designed and built from the bottom-up with a single-visit instrument precision requirement of 27 cm s −1 , close attention is paid to the error contribution from each NEID subsystem. Finally, we include the lab and on-sky tests performed during instrument commissioning to test the illumination stability, and discuss the path to achieving the instrumental stability required to search for a true Earth twin around a solar-type star.
Phylogeny, evolution, and biogeographic history of Calandrinia (Montiaceae)
Publisher: Wiley
Date: 06-2018
DOI: 10.1002/AJB2.1110
Abstract: Calandrinia are small, succulent herbs that vary broadly in habitat, morphology, life history, and photosynthetic metabolism. The lineage is placed within the Montiaceae, which in turn is sister to the rest of the Portulacineae (Caryophyllales). Calandrinia occupy two distinct biogeographic regions, one in the Americas (~14 species), and one in Australia (~74 species). Past analyses of the Montiaceae present conflicting hypotheses for the phylogenetic placement and monophyly of Calandrinia, and to date, there has been no molecular phylogenetic analysis of the Australian species. Using a targeted gene enrichment approach, we sequenced 297 loci from multiple gene families across the Montiaceae, including all named and 16 putative new species of Australian Calandrinia, and the enigmatic monotypic genus Rumicastrum. All data sets and analyses reject the monophyly of Calandrinia, with Australian and New World Calandrinia each comprising distinct and well-supported clades, and Rumicastrum nested within Australian Calandrinia. We provide the first well-supported phylogeny for Australian Calandrinia, which includes all named species and several phrase-named taxa. This study brings much needed clarity to relationships within Montiaceae and confirms that New World and Australian Calandrinia do not form a clade. Australian Calandrinia is a longtime resident of the continent, having erged from its sister lineage ~30 Ma, concurrent with separation of Australia from Antarctica. Most ersification occurred during the middle Miocene, with lowered speciation and/or higher extinction rates coincident with the establishment of severe aridity by the late Miocene.
Restoring Australia's temperate grasslands and grassy woodlands: integrating function and diversity.
Publisher: Wiley
Date: 29-03-2005
TOI-1231 b: A Temperate, Neptune-sized Planet Transiting the Nearby M3 Dwarf NLTT 24399
Publisher: American Astronomical Society
Date: 03-08-2021
2023 Astrophotonics Roadmap: pathways to realizing multi-functional integrated astrophotonic instruments
Publisher: IOP Publishing
Date: 10-2023
Abstract: Photonic technologies offer numerous functionalities that can be used to realize astrophotonic instruments. The most spectacular ex le to date is the ESO Gravity instrument at the Very Large Telescope in Chile that combines the light-gathering power of four 8-m telescopes through a complex photonic interferometer. Fully integrated astrophotonic devices offer critical advantages for instrument development, including extreme miniaturization when operating at the diffraction-limit, plus integration, superior thermal and mechanical stabilization owing to the small footprint, and high replicability offering significant cost savings. Numerous astrophotonic technologies have been developed to address shortcomings of conventional instruments to date, including the development of photonic lanterns to convert from multimode inputs to single mode outputs, complex aperiodic fiber Bragg gratings to filter OH emission from the atmosphere, beam combiners enabling long baseline interferometry with for ex le, ESO Gravity, and laser frequency combs for high precision spectral calibration of spectrometers. Despite these successes, the facility implementation of photonic solutions in astronomical instrumentation is currently limited because of 1) low throughputs from coupling to fibers, coupling fibers to chips, propagation and bend losses, device losses, etc., 2) difficulties with scaling to large channel count devices needed for large bandwidths and high resolutions, and 3) efficient integration of photonics with detectors. In this roadmap, we identify 23 key areas that need further development. We outline the challenges and advances needed across those areas covering design tools, simulation capabilities, fabrication processes, the need for entirely new components, integration and hybridization and the characterization of devices. To realize these advances the astrophotonics community will have to work cooperatively with industrial partners who have more advanced manufacturing capabilities. With the advances described herein, multi-functional integrated instruments will be realized leading to novel observing capabilities for both ground and space based platforms, enabling new scientific studies and discoveries.
Related Organisations
University Of California, Berkeley
Location: United States of America
Massachusetts Institute Of Technology
Location: United States of America
California Institute Of Technology
Location: United States of America
Related Funding Activities
Linkage Projects - Grant ID: LP120100350
Start Date: 11-2012
End Date: 11-2016
Amount: $549,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP120200063
Start Date: 10-2012
End Date: 12-2016
Amount: $360,056.00
Funder: Australian Research Council
View Funded Activity