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A seven-planet resonant chain in TRAPPIST-1

Rodrigo Luger 1, 2 Marko Sestovic 3 Ethan Kruse 1 Simon L. Grimm 3 Brice-Olivier Demory 3 Eric Agol 1, 2 Emeline Bolmont 4 Daniel Fabrycky 5 Catarina S. Fernandes 6 Valérie van Grootel 6 Adam Burgasser 7 Michaël Gillon 6 James G. Ingalls 8 Emmanuël Jehin 6 Sean N. Raymond 9, 10 Franck Selsis 10, 9 Amaury H. M. J. Triaud 11 Thomas Barclay 12, 13 Geert Barentsen 12, 13 Steve B. Howell 12 Laetitia Delrez 6, 14 Julien de Wit 15 Daniel Foreman-Mackey 1 Daniel L. Holdsworth 16 J. Leconte 10, 9 Susan Lederer 17 Martin Turbet 18 Yaseen Almleaky 19 Zouhair Benkhaldoun 20 Pierre Magain 6 Brett M. Morris 1 Kevin Heng 3 Didier Queloz 21, 14
Abstract : The TRAPPIST-1 system is the first transiting planet system found orbiting an ultra-cool dwarf star. At least seven planets similar to Earth in radius and in mass were previously found to transit this host star. Subsequently, TRAPPIST-1 was observed as part of the K2 mission and, with these new data, we report the measurement of an 18.764 d orbital period for the outermost planet, TRAPPIST-1h, which was unconstrained until now. This value matches our theoretical expectations based on Laplace relations and places TRAPPIST-1h as the seventh member of a complex chain, with three-body resonances linking every member. We find that TRAPPIST-1h has a radius of 0.715 Earth radii and an equilibrium temperature of 169 K, placing it at the snow line. We have also measured the rotational period of the star at 3.3 d and detected a number of flares consistent with an active, middle-aged, late M dwarf.
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Rodrigo Luger, Marko Sestovic, Ethan Kruse, Simon L. Grimm, Brice-Olivier Demory, et al.. A seven-planet resonant chain in TRAPPIST-1. Nature Astronomy, Nature Publishing Group, 2017, 1, pp.0129. ⟨10.1038/s41550-017-0129⟩. ⟨hal-01489220⟩

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