The GALAH Survey: improving our understanding of confirmed and candidate planetary systems with large stellar surveys
Article
Article Title | The GALAH Survey: improving our understanding of confirmed and candidate planetary systems with large stellar surveys |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Clark, Jake T. (Author), Wright, Duncan J. (Author), Wittenmyer, Robert A. (Author), Horner, Jonathan (Author), Hinkel, Natalie R. (Author), Clerte, Mathieu (Author), Carter, Brad D. (Author), Buder, Sven (Author), Hayden, Michael R. (Author), Bland-Hawthorn, Joss (Author), Casey, Andrew R. (Author), de Silva, Gayandhi M. (Author), D'Orazi, Valentina (Author), Freeman, Ken C. (Author), Kos, Janez (Author), Lewis, Geraint F. (Author), Lin, Jane (Author), Lind, Karin (Author), Martell, Sarah L. (Author), Schlesinger, Katharine J. (Author), Sharma, Sanjib (Author), Simpson, Jeffrey D. (Author), Stello, Dennis (Author), Zucker, Daniel B. (Author), Zwitter, Tomaz (Author), Munari, Ulisse (Author) and Nordlander, Thomas (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 510 (2), pp. 2041-2060 |
Number of Pages | 20 |
Year | 2021 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stab3498 |
Web Address (URL) | https://academic.oup.com/mnras/article/510/2/2041/6448482 |
Abstract | Pioneering photometric, astrometric, and spectroscopic surveys are helping exoplanetary scientists better constrain the fundamental properties of stars within our galaxy, and the planets these stars host. In this study, we use the third data release from the stellar spectroscopic GALAH Survey, coupled with astrometric data of eDR3 from the Gaia satellite, and other data from NASA's Exoplanet Archive, to refine our understanding of 279 confirmed and candidate exoplanet host stars and their exoplanets. This homogenously analysed data set comprises 105 confirmed exoplanets, along with 146 K2 candidates, 95 TESS Objects of Interest (TOIs) and 52 Community TOIs (CTOIs). Our analysis significantly shifts several previously (unknown) planet parameters while decreasing the uncertainties for others; Our radius estimates suggest that 35 planet candidates are more likely brown dwarfs or stellar companions due to their new radius values. We are able to refine the radii and masses of WASP-47 e, K2-106 b, and CoRoT-7 b to their most precise values yet, to less than 2.3% and 8.5% respectively. We also use stellar rotational values from GALAH to show that most planet candidates will have mass measurements that will be tough to obtain with current ground-based spectrographs. With GALAH's chemical abundances, we show through chemo-kinematics that there are five planet-hosts that are associated with the galaxy's thick disc, including NGTS-4, K2-183 and K2-337. Finally, we show there is no statistical difference between the chemical properties of hot Neptune and hot rocky exoplanet hosts, with the possibility that short-period rocky worlds might be the remnant cores of hotter, gaseous worlds. |
Keywords | stars: fundamental parameters; planets and satellites: fundamental; parameters; planets and satellites: terrestrial planets; surveys; planets and satellites: detection; Astrophysics - Earth and Planetary; Astrophysics; Astrophysics - Astrophysics of Galaxies; Astrophysics - Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510104. Galactic astronomy |
510109. Stellar astronomy and planetary systems | |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Centre for Astrophysics |
Southwest Research Institute, United States | |
Australian National University | |
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions, Australia | |
Monash University | |
Macquarie University | |
National Institute for Astrophysics, Italy | |
University of Ljubljana, Slovenia | |
University of Sydney | |
Stockholm University, Sweden | |
INAF - Astronomical Observatory of Padova, Italy | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6z0z/the-galah-survey-improving-our-understanding-of-confirmed-and-candidate-planetary-systems-with-large-stellar-surveys
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