ORCID Profile
0000-0002-6907-4476
Current Organisations
University of the Sunshine Coast
,
Technical University of Denmark
,
Universität Bern
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Publisher: Informa UK Limited
Date: 04-04-2014
Publisher: American Astronomical Society
Date: 27-10-2021
Publisher: Infonomics Society
Date: 06-2017
Publisher: Alberta Journal of Educational Research
Date: 2022
Publisher: Oxford University Press (OUP)
Date: 06-04-2023
Abstract: We present an optical transmission spectrum of the hot Jupiter WASP-101b. We observed three primary transits with Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph, covering a wavelength range from 0.3 to 1 $\\mu$m. The observations suffer from significant systematics that we model using Gaussian Processes. Kernel selection for the Gaussian Processes is performed in a data-driven approach through Bayesian model comparison. We find a flat and featureless transmission spectrum, corroborating a previous measurement obtained with HST/Wide-Field Camera 3 in the 1–1.7 $\\mu$m range. The spectrum is consistent with high-altitude clouds located at less than 100 $\\mu$bar. This cloud layer completely blocks our view into deeper parts of the atmosphere and makes WASP-101b the cloudiest gas giant observed so far. We compute a series of temperature-pressure profiles for WASP-101b and compare these to condensation curves for cloud particles, which match clouds composed of silicates. We also include 13 transits observed with Transiting Exoplanet Survey Satellite and use these to refine system parameters.
Publisher: Te Pukenga
Date: 2022
DOI: 10.34074/WHIT.2910
Publisher: Walter de Gruyter GmbH
Date: 12-2016
Abstract: It is my privilege to work as a tertiary learning advisor (TLA). Through my role I have had the opportunity to form unique relationships with students during in idual consultations. This has enabled me to observe student behaviour, and the metacognitive strategies students use to negotiate the myriad challenges of tertiary study. I noticed trends in student behaviour that did not fit current literature on teaching and learning, and identified possible links between the observed student feelings of overwhelm, and sensory processing sensitivity (SPS) and highly sensitive people (HSP), the term used to describe humans with SPS. This paper examines the transformative journey I took in identifying the key indicators of SPS, firstly in myself, and then in my students. My burgeoning knowledge and reflection on and in my own practice provided self-scaffolding that enabled me to recognise and share the markers of SPS. My study ‘Does an understanding of HSP help students who identify as Highly Sensitive People (HSP) to manage their learning?’ found that HSP students unanimously rate the knowledge of SPS to be life-changing and empowering in managing life and study. All participants also believed that information about SPS should be made available to all in-coming students, and that tutors should be given training and resources in order to better support HSP students. Of significance, it also found that tertiary students with SPS have often already developed useful metacognitive strategies for independent and life-long learning by the time they reach tertiary level education.
Publisher: American Astronomical Society
Date: 13-02-2023
Abstract: Irradiated Jovian atmospheres are complex and dynamic and can undergo temporal variations due to the close proximity of their parent stars. Of the Jovian planets that have been cataloged to date, KELT-9b is the hottest gas giant known, with an equilibrium temperature of 4050 K. We probe the temporal variability of transmission spectroscopic signatures from KELT-9b via a set of archival multiyear ground-based transit observations, performed with the TRES facility on the 1.5 m reflector at the Fred Lawrence Whipple Observatory. Our observations confirm past detections of Fe i , Fe ii , and Mg i over multiple epochs, in addition to excess absorption at H α , which is an indicator for ongoing mass loss. From our multiyear data set, the H α light curve consistently deviates from a standard transit and follows a “W” shape that is deeper near ingress and egress and shallower midtransit. To search for and quantify any seasonal variations that may be present, we parameterize a “cometary tail” model to fit for the H α transit. We find no detectable variations between the different observed epochs. Though a “cometary tail” describes the H α flux variations well, we note that such a scenario requires a high density of neutral hydrogen in the n = 2 excited state far beyond the planetary atmosphere. Other scenarios, such as center-to-limb variations larger than that expected from 1D atmosphere models, may also contribute to the observed H α transit shape. These multiepoch observations highlight the capabilities of small telescopes to provide temporal monitoring of the dynamics of exoplanet atmospheres.
Publisher: University of the Sunshine Coast, Queensland
Date: 2022
DOI: 10.25907/00122
Publisher: EDP Sciences
Date: 10-2021
DOI: 10.1051/0004-6361/202040100
Abstract: Ultra-hot Jupiters are defined as giant planets with equilibrium temperatures larger than 2000 K. Most of them are found orbiting bright A-F type stars, making them extremely suitable objects to study their atmospheres using high-resolution spectroscopy. Recent studies show a variety of atoms and molecules detected in the atmospheres of this type of planets. Here we present our analysis of the newly discovered ultra-hot Jupiter TOI-1431 b/MASCARA-5 b, using two transit observations with the HARPS-N spectrograph and one transit observation with the EXPRES spectrograph. Analysis of the Rossiter-McLaughlin effect shows that the planet is in a polar orbit, with a projected obliquity λ = −155 −10 +20 degrees. Combining the nights and applying both cross-correlation methods and transmission spectroscopy, we find no evidences of Ca I , Fe I , Fe II , Mg I , Na I , V I , TiO, VO or H α in the atmosphere of the planet. Our most likely explanation for the lack of atmospheric features is the large surface gravity of the planet.
Location: United States of America
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Joao Mendonca.