TY - JOUR
T1 - The GALAH Survey
T2 - using galactic archaeology to refine our knowledge of TESS target stars
AU - Clark, Jake T.
AU - Clerté, Mathieu
AU - Hinkel, Natalie R.
AU - Unterborn, Cayman T.
AU - Wittenmyer, Robert A.
AU - Horner, Jonathan
AU - Wright, Duncan J.
AU - Carter, Brad
AU - Morton, Timothy D.
AU - Spina, Lorenzo
AU - Asplund, Martin
AU - Buder, Sven
AU - Bland-Hawthorn, Joss
AU - Casey, Andy
AU - De Silva, Gayandhi
AU - D'Orazi, Valentina
AU - Duong, Ly
AU - Hayden, Michael
AU - Freeman, Ken
AU - Kos, Janez
AU - Lewis, Geraint
AU - Lin, Jane
AU - Lind, Karin
AU - Martell, Sarah
AU - Sharma, Sanjib
AU - Simpson, Jeffrey
AU - Zucker, Dan
AU - Zwitter, Tomaz
AU - Tinney, Christopher G.
AU - Ting, Yuan Sen
AU - Nordlander, Thomas
AU - Amarsi, Anish M.
N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 504, Issue 4, July 2021, Pages 4968–4989, https://doi.org/10.1093/mnras/stab1052. Copyright 2021 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
PY - 2021/7/1
Y1 - 2021/7/1
N2 - An unprecedented number of exoplanets are being discovered by the Transiting Exoplanet Survey Satellite (TESS). Determining the orbital parameters of these exoplanets, and especially their mass and radius, will depend heavily upon the measured physical characteristics of their host stars. We have cross-matched spectroscopic, photometric, and astrometric data from GALAH Data Release 2, the TESS Input Catalog and Gaia Data Release 2, to create a curated, self-consistent catalogue of physical and chemical properties for 47 285 stars. Using these data, we have derived isochrone masses and radii that are precise to within 5 per cent. We have revised the parameters of three confirmed, and twelve candidate, TESS planetary systems. These results cast doubt on whether CTOI-20125677 is indeed a planetary system, since the revised planetary radii are now comparable to stellar sizes. Our GALAH-TESS catalogue contains abundances for up to 23 elements. We have specifically analysed the molar ratios for C/O, Mg/Si, Fe/Si, and Fe/Mg, to assist in determining the composition and structure of planets with Rp < 4R⊕. From these ratios, 36 per cent fall within 2σ sigma of the Sun/Earth values, suggesting that these stars may host rocky exoplanets with geological compositions similar to planets found within our own Solar system.
AB - An unprecedented number of exoplanets are being discovered by the Transiting Exoplanet Survey Satellite (TESS). Determining the orbital parameters of these exoplanets, and especially their mass and radius, will depend heavily upon the measured physical characteristics of their host stars. We have cross-matched spectroscopic, photometric, and astrometric data from GALAH Data Release 2, the TESS Input Catalog and Gaia Data Release 2, to create a curated, self-consistent catalogue of physical and chemical properties for 47 285 stars. Using these data, we have derived isochrone masses and radii that are precise to within 5 per cent. We have revised the parameters of three confirmed, and twelve candidate, TESS planetary systems. These results cast doubt on whether CTOI-20125677 is indeed a planetary system, since the revised planetary radii are now comparable to stellar sizes. Our GALAH-TESS catalogue contains abundances for up to 23 elements. We have specifically analysed the molar ratios for C/O, Mg/Si, Fe/Si, and Fe/Mg, to assist in determining the composition and structure of planets with Rp < 4R⊕. From these ratios, 36 per cent fall within 2σ sigma of the Sun/Earth values, suggesting that these stars may host rocky exoplanets with geological compositions similar to planets found within our own Solar system.
KW - Catalogues
KW - Methods: observational
KW - Planets and satellites: interiors
KW - Stars: abundances
KW - Stars: fundamental parameters
UR - http://www.scopus.com/inward/record.url?scp=85108603353&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/arc/CE170100013
U2 - 10.1093/mnras/stab1052
DO - 10.1093/mnras/stab1052
M3 - Article
AN - SCOPUS:85108603353
SN - 0035-8711
VL - 504
SP - 4968
EP - 4989
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -