The GALAH Survey: improving our understanding of confirmed and candidate planetary systems with large stellar surveys

Clark, Jake T. and Wright, Duncan J. and Wittenmyer, Robert A. and Horner, Jonathan and Hinkel, Natalie R. and Clerte, Mathieu and Carter, Brad D. ORCID: https://orcid.org/0000-0003-0035-8769 and Buder, Sven and Hayden, Michael R. and Bland-Hawthorn, Joss and Casey, Andrew R. and de Silva, Gayandhi M. and D'Orazi, Valentina and Freeman, Ken C. and Kos, Janez and Lewis, Geraint F. and Lin, Jane and Lind, Karin and Martell, Sarah L. and Schlesinger, Katharine J. and Sharma, Sanjib and Simpson, Jeffrey D. and Stello, Dennis and Zucker, Daniel B. and Zwitter, Tomaz and Munari, Ulisse and Nordlander, Thomas (2021) The GALAH Survey: improving our understanding of confirmed and candidate planetary systems with large stellar surveys. Monthly Notices of the Royal Astronomical Society, 510 (2). pp. 2041-2060. ISSN 0035-8711

[img]
Preview
Text (Published Version)
The GALAH Survey Improving our understanding of confirmed.pdf

Download (3MB) | Preview

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.


Statistics for USQ ePrint 46133
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 14 Feb 2022 07:03
Last Modified: 01 Mar 2022 02:12
Uncontrolled 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
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020104 Galactic Astronomy
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510104 Galactic astronomy
51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1093/mnras/stab3498
URI: http://eprints.usq.edu.au/id/eprint/46133

Actions (login required)

View Item Archive Repository Staff Only