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Article Dans Une Revue Nature Astronomy Année : 2017

A seven-planet resonant chain in TRAPPIST-1

Marko Sestovic
Daniel Fabrycky
Michaël Gillon
Emmanuël Jehin
Susan Lederer
Zouhair Benkhaldoun
Kevin Heng

Résumé

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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Dates et versions

hal-01489220 , version 1 (21-03-2019)

Identifiants

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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, 2017, 1, pp.0129. ⟨10.1038/s41550-017-0129⟩. ⟨hal-01489220⟩
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