LHS 1815b: The First Thick-disk Planet Detected by TESS

Gan, Tianjun and Shporer, Avi and Livingston, John H. and Collins, Karen A. and Mao, Shude and Trani, Alessandro A. and Gandolfi, Davide and Hirano, Teruyuki and Luque, Rafael and Stassun, Keivan G. and Ziegler, Carl and Howell, Steve B. and Hellier, Coel and Irwin, Jonathan M. and Winters, Jennifer G. and Anderson, David R. and Briceno, Cesar and Law, Nicholas and Mann, Andrew W. and Bonfils, Xavier and Astudillo-Defru, Nicola and Jensen, Eric L. N. and Anglada-Escude, Guillem and Ricker, George R. and Vanderspek, Roland and Latham, David W. and Seager, Sara and Winn, Joshua N. and Jenkins, Jon M. and Furesz, Gabor and Guerrero, Natalia M. and Quintana, Elisa and Twicken, Joseph D. and Caldwell, Douglas A. and Tenenbaum, Peter and Huang, Chelsea X. ORCID: https://orcid.org/0000-0003-0918-7484 and Rowden, Pamela and Rojas-Ayala, Barbara (2020) LHS 1815b: The First Thick-disk Planet Detected by TESS. The Astronomical Journal, 159 (4):160. pp. 1-12. ISSN 0004-6256

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We report the first discovery of a thick-disk planet, LHS 1815b (TOI-704b, TIC 260004324), detected in the Transiting Exoplanet Survey Satellite (TESS) survey. LHS 1815b transits a bright (V = 12.19 mag, K = 7.99 mag) and quiet M dwarf located 29.87 ± 0.02 pc away with a mass of 0.502 ± 0.015 M o˙ and a radius of 0.501 ± 0.030 R o˙. We validate the planet by combining space- and ground-based photometry, spectroscopy, and imaging. The planet has a radius of 1.088 ± 0.064 R ⊕ with a 3σ mass upper limit of 8.7 M ⊕. We analyze the galactic kinematics and orbit of the host star LHS 1815 and find that it has a large probability (P thick/P thin = 6482) to be in the thick disk with a much higher expected maximal height (Z max = 1.8 kpc) above the Galactic plane compared with other TESS planet host stars. Future studies of the interior structure and atmospheric properties of planets in such systems using, for example, the upcoming James Webb Space Telescope, can investigate the differences in formation efficiency and evolution for planetary systems between different Galactic components (thick disks, thin disks, and halo).

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 03 Apr 2022 22:43
Last Modified: 19 May 2022 03:43
Uncontrolled Keywords: Astrometric exoplanet detection (2130); Astrometry (80); Stellar kinematics (1608); Transit photometry (1709); Radial velocity (1332); Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Astrophysics of Galaxies; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: https://doi.org/10.3847/1538-3881/ab775a
URI: http://eprints.usq.edu.au/id/eprint/47420

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