LHS 1815b: The First Thick-disk Planet Detected by TESS
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Gan_2020_AJ_159_160.pdf
Description
Published version
Size
3.55 MB
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Checksum (MD5)
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Author(s)
Gan, Tianjun
Shporer, Abraham-Avi
Livingston, John H.
Collins, Karen A.
Mao, Shude
Trani, Alessandro A.
Gandolfi, Davide
Hirano, Teruyuki
Luque, Rafael
Stassun, Keivan G.
Date Issued
March 2020
Journal
The Astronomical Journal
Publisher
American Astronomical Society
Citation
Gan, Tianjun, et al. "LHS 1815b: The First Thick-disk Planet Detected by TESS." The Astronomical Journal, 159 (April 2020). © 2020. The American Astronomical Society. All rights reserved.
Version
Final published version
Abstract
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 ⊙ and a radius of 0.501 ± 0.030 R ⊙. 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). Keywords: Astrometric exoplanet detection ; Astrometry; Stellar kinematics; Transit photometry; Radio velocity
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.3847/1538-3881/ab775a
