TY - JOUR
T1 - LHS 1815b
T2 - The First Thick-disk Planet Detected by TESS
AU - Gan, Tianjun
AU - Shporer, Avi
AU - Livingston, John H.
AU - Collins, Karen A.
AU - Mao, Shude
AU - Trani, Alessandro A.
AU - Gandolfi, Davide
AU - Hirano, Teruyuki
AU - Luque, Rafael
AU - Stassun, Keivan G.
AU - Ziegler, Carl
AU - Howell, Steve B.
AU - Hellier, Coel
AU - Irwin, Jonathan M.
AU - Winters, Jennifer G.
AU - Anderson, David R.
AU - Briceño, César
AU - Law, Nicholas
AU - Mann, Andrew W.
AU - Bonfils, Xavier
AU - Astudillo-Defru, Nicola
AU - Jensen, Eric L.N.
AU - Anglada-Escudé, Guillem
AU - Ricker, George R.
AU - Vanderspek, Roland
AU - Latham, David W.
AU - Seager, Sara
AU - Winn, Joshua N.
AU - Jenkins, Jon M.
AU - Furesz, Gabor
AU - Guerrero, Natalia M.
AU - Quintana, Elisa
AU - Twicken, Joseph D.
AU - Caldwell, Douglas A.
AU - Tenenbaum, Peter
AU - Huang, Chelsea X.
AU - Rowden, Pamela
AU - Rojas-Ayala, Bárbara
N1 - Publisher Copyright:
© 2020. The American Astronomical Society. All rights reserved.
PY - 2020/4
Y1 - 2020/4
N2 - 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).
AB - 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).
UR - https://www.scopus.com/pages/publications/85087184376
U2 - 10.3847/1538-3881/ab775a
DO - 10.3847/1538-3881/ab775a
M3 - Article
AN - SCOPUS:85087184376
SN - 0004-6256
VL - 159
JO - Astronomical Journal
JF - Astronomical Journal
IS - 4
M1 - 160
ER -