J
Jeffrey D. Simpson
Researcher at University of New South Wales
Publications - 97
Citations - 4008
Jeffrey D. Simpson is an academic researcher from University of New South Wales. The author has contributed to research in topics: Stars & Galaxy. The author has an hindex of 26, co-authored 97 publications receiving 2835 citations. Previous affiliations of Jeffrey D. Simpson include University of Canterbury & University of Sydney.
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Journal ArticleDOI
K2-HERMES II. Planet-candidate properties from K2 Campaigns 1-13
Robert A. Wittenmyer,Jake T. Clark,Sanjib Sharma,Dennis Stello,Jonathan Horner,Stephen R. Kane,Catherine Stevens,Duncan J. Wright,Lorenzo Spina,Klemen Čotar,Martin Asplund,Joss Bland-Hawthorn,Sven Buder,Sven Buder,Andrew R. Casey,Gayandhi M. De Silva,Valentina D'Orazi,Kenneth C. Freeman,Janez Kos,Geraint F. Lewis,Jane Lin,Karin Lind,Karin Lind,Sarah L. Martell,Jeffrey D. Simpson,Daniel B. Zucker,Tomaz Zwitter +26 more
TL;DR: In this article, the authors present complete host-star parameters and planet-candidate radii for 224 K2 candidate candidates from the K2-HERMES survey, which uses the HERMES multi-object spectrograph on the Anglo-Australian Telescope to obtain $R\sim 28\, 000$ spectra for more than 30 000 K2 stars.
Proceedings ArticleDOI
Radioactive emission from high-index,optical glasses and atypical effects on CCDs
Michael Edgar,Ross Zhelem,Lewis Waller,Janez Kos,Don Mayfield,Naveen Pai,Andrew I. Sheinis,Gayandhi M. De Silva,Gayandhi M. De Silva,Jeffrey D. Simpson,Nicholas Stazak +10 more
TL;DR: In this article, the anomalous event rate for 15 separate optical glasses with nd ≥ 1.6 was analyzed and the source of these events was identified as α-particles from trace amounts of nuclides in the actinium decay series, parent 235U.
The GALAH survey: Co-orbiting stars and chemical tagging
TL;DR: Oh et al. as mentioned in this paper used the second data release of the GALAH survey of stellar parameters and elemental abundances of 15 pairs of stars identified by Oh et al 2017 to find that 11 very wide (>1.7 pc) pairs have similar Galactic orbits, while a further four claimed co-moving pairs are not truly co-orbiting.
Journal ArticleDOI
The GALAH Survey: No chemical evidence of an extragalactic origin for the Nyx stream
Daniel B. Zucker,Jeffrey D. Simpson,Sarah L. Martell,Geraint F. Lewis,Andrew R. Casey,Yuan-Sen Ting,Yuan-Sen Ting,Yuan-Sen Ting,Jonathan Horner,Thomas Nordlander,Rosemary F. G. Wyse,Tomaž Zwitter,Joss Bland-Hawthorn,Sven Buder,Martin Asplund,Gayandhi M. De Silva,Valentina D'Orazi,Kenneth C. Freeman,Michael R. Hayden,Janez Kos,Jane Lin,Karin Lind,Katharine J. Schlesinger,Sanjib Sharma,Dennis Stello +24 more
TL;DR: In this paper, a combination of elemental abundances and stellar parameters from the GALAH and APOGEE surveys was used to find that the abundances of the highest likelihood Nyx members are entirely consistent with membership of the thick disk, and inconsistent with a dwarf galaxy origin.
Journal ArticleDOI
A data-driven model of nucleosynthesis with chemical tagging in a lower-dimensional latent space
Andrew R. Casey,John C. Lattanzio,Aldeida Aleti,David L. Dowe,Joss Bland-Hawthorn,Joss Bland-Hawthorn,Sven Buder,Sven Buder,Geraint F. Lewis,Sarah L. Martell,Thomas Nordlander,Jeffrey D. Simpson,Sanjib Sharma,Daniel B. Zucker +13 more
TL;DR: This work introduces a data-driven model of nucleosynthesis where a set of latent factors contribute to all stars with different scores, and clustering is modelled by a mixture of multivariate Gaussians in a lower-dimensional latent space.