ORCID Profile
0000-0003-4401-5506
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Publisher: Cambridge University Press (CUP)
Date: 09-2011
DOI: 10.1017/S1743921312001299
Abstract: Motivated by recent discoveries of isolated, dispersed radio pulses of possible extragalactic origin, we are performing a commensal search for short-duration (ms) continuum radio pulses using the Very Long Baseline Array (VLBA). The geographically separated antennæ of the VLBA make the system robust to local RFI and allow events to be verified and localised on the sky with milli-arcsec accuracy. We report sky coverage and detection limits from the experiment to date.
Publisher: American Geophysical Union (AGU)
Date: 07-2022
DOI: 10.1029/2021JE007145
Abstract: We present a catalog of new impacts on Mars. These craters formed in the last few decades, constrained with repeat orbital imaging. Crater diameters range from 58 m down to m. For each impact, we report whether it formed a single crater or a cluster (58% clusters) albedo features of the blast zone (88% halos 64% linear rays 10% arcuate rays majority dark‐toned 4% light‐toned 14% dual‐toned) and exposures of ice (4% definite 2% possible). We find no trends in the occurrences of clusters with latitude, elevation, or impact size. Albedo features do not depend on atmospheric fragmentation. Halos are more prevalent at lower elevations, indicating an atmospheric pressure dependence and around smaller impacts, which could be an observational bias. Linear rays are more likely to form from larger impacts into more consolidated material and may be enhanced by lower atmospheric pressure at higher elevations. Light‐ and dual‐toned blast zones occur in specific regions and more commonly around larger impacts, indicating excavation of compositionally distinct material. Surfaces covered with bright dust lacking cohesion are favored to form detectable surface features. The slope of the cumulative size frequency distribution for this data set is 2.2 for diameters m (differential slope 2.9), significantly shallower than the slope of new lunar craters. We believe that no systematic biases exist in the Martian data set sufficient to explain the discrepancy. This catalog is complete at the time of writing, although observational biases exist, and new discoveries continue.
Publisher: American Astronomical Society
Date: 02-08-2016
Publisher: IEEE
Date: 12-2013
Publisher: American Astronomical Society
Date: 19-03-2013
Publisher: American Astronomical Society
Date: 26-06-2012
Publisher: Cambridge University Press (CUP)
Date: 09-2011
DOI: 10.1017/S1743921312001196
Abstract: The VAST survey is a wide-field survey that observes with unprecedented instrument sensitivity (0.5 mJy or lower) and repeat cadence (a goal of 5 seconds) that will enable novel scientific discoveries related to known and unknown classes of radio transients and variables. Given the unprecedented observing characteristics of VAST, it is important to estimate source classification performance, and determine best practices prior to the launch of ASKAP's BETA in 2012. The goal of this study is to identify light-curve characterization and classification algorithms that are best suited for archival VAST light-curve classification. We perform our experiments on light-curve simulations of eight source types and achieve best-case performance of approximately 90% accuracy. We note that classification performance is most influenced by light-curve characterization rather than classifier algorithm.
Publisher: IOP Publishing
Date: 22-06-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2014
DOI: 10.1109/MIS.2013.10
Publisher: American Astronomical Society
Date: 22-06-2011
Publisher: American Astronomical Society
Date: 22-06-2011
No related grants have been discovered for Kiri Wagstaff.