The GALAH Survey: using galactic archaeology to refine our knowledge of TESS target stars

Author:

Clark Jake T1ORCID,Clerté Mathieu1,Hinkel Natalie R2,Unterborn Cayman T3,Wittenmyer Robert A1,Horner Jonathan1,Wright Duncan J1,Carter Brad1ORCID,Morton Timothy D4,Spina Lorenzo5ORCID,Asplund Martin6,Buder Sven67ORCID,Bland-Hawthorn Joss78ORCID,Casey Andy5ORCID,De Silva Gayandhi5,D’Orazi Valentina9,Duong Ly6,Hayden Michael78,Freeman Ken6,Kos Janez710,Lewis Geraint8ORCID,Lin Jane6,Lind Karin11,Martell Sarah712ORCID,Sharma Sanjib8ORCID,Simpson Jeffrey78ORCID,Zucker Dan1314,Zwitter Tomaz10ORCID,Tinney Christopher G1516,Ting (丁源森) Yuan-Sen6171819,Nordlander Thomas67ORCID,Amarsi Anish M711ORCID

Affiliation:

1. Centre for Astrophysics, University of Southern Queensland, West Street, Toowoomba, QLD 4350, Australia

2. Space Science and Engineering Division, Southwest Research Institute, San Antonio, TX 78238, USA

3. School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA

4. Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089, USA

5. Monash Centre for Astrophysics, School of Physics and Astronomy, Monash University, VIC 3800, Australia

6. Research School of Astronomy & Astrophysics, Australian National University, ACT 2611, Australia

7. Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D), ACT 2611, Australia

8. Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia

9. INAF Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 5, I-35122, Padova, Italy

10. Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia

11. Max Planck Institute for Astronomy (MPIA), Koenigstuhl 17, D-69117 Heidelberg, Germany

12. School of Physics, University of New South Wales – Sydney, Sydney 2052, Australia

13. Department of Physics & Astronomy, Macquarie University, Sydney, NSW 2109, Australia

14. Research Centre in Astronomy, Astrophysics & Astrophotonics, Macquarie University, Sydney, NSW 2109, Australia

15. Exoplanetary Science at UNSW, University of New South Wales, Sydney, NSW 2052, Australia

16. Australian Centre for Astrobiology, University of New South Wales, Sydney, NSW 2052, Australia

17. Institute for Advanced Study, Princeton, NJ 08540, USA

18. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA

19. Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA

Abstract

ABSTRACT 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 2$\sigma$ 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.

Funder

NASA

California Institute of Technology

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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