A seven-planet resonant chain in TRAPPIST-1

被引：279
作者：
Luger, Rodrigo [1 ]
Sestovic, Marko
Kruse, Ethan
Grimm, Simon L.
Demory, Brice-Olivier
Agol, Eric
Bolmont, Emeline
Fabrycky, Daniel
Fernandes, Catarina S.
Van Grootel, Valerie
Burgasser, Adam
Gillon, Michael
Ingalls, James G.
Jehin, Emmanuel
Raymond, Sean N.
Selsis, Franck
Triaud, Amaury H. M. J.
Barclay-, Thomas
Barentsen, Geert
Howell, Steve B.
Delrez, Laetitia
de Wit, Julien
Foreman-Mackey, Daniel
Holdsworth, Daniel L.
Leconte, Jeremy
Lederer, Susan
Turbet, Martin
Almleaky, Yaseen
Benkhaldoun, Zouhair
Magain, Pierre
Morris, Brett M.
Heng, Kevin
Queloz, Didier
机构：
[1] Univ Washington, Dept Astron, Seattle, WA 98195 USA
来源：
NATURE ASTRONOMY | 2017年 / 1卷 / 06期
基金：
美国国家科学基金会; 欧洲研究理事会; 瑞士国家科学基金会; 英国科学技术设施理事会;
关键词：
HOT SUPER-EARTHS; TRANSITING PLANETS; HABITABLE ZONES; KINEMATICS; SYSTEMS; II; EXOPLANETS; MIGRATION; ALGORITHM; EVOLUTION;
D O I：
10.1038/s41550-017-0129
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The TRAPPIST-1 system is the first transiting planet system found orbiting an ultracool dwarf star(1). At least seven planets similar in radius to Earth were previously found to transit this host star(2). Subsequently, TRAPPIST-1 was observed as part of the K2 mission and, with these new data, we report the measurement of an 18.77 day orbital period for the outermost transiting planet, TRAPPIST-1 h, which was previously unconstrained. This value matches our theoretical expectations based on Laplace relations(3) and places TRAPPIST-1 h as the seventh member of a complex chain, with three-body resonances linking every member. We find that TRAPPIST-1 h has a radius of 0.752 R-circle plus and an equilibrium temperature of 173 K. We have also measured the rotational period of the star to be 3.3 days and detected a number of flares consistent with a low-activity, middle-aged, late M dwarf.
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页数：8
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