A seven-planet resonant chain in TRAPPIST-1

Luger, Rodrigo; Sestovic, Marko; Kruse, Ethan; Grimm, Simon L.; Demory, Brice-Olivier; Agol, Eric; Bolmont, Emeline; Fabrycky, Daniel; Fernandes, Catarina S.; Van Grootel, Valérie; Burgasser, Adam; Gillon, Michaël; Ingalls, James G.; Jehin, Emmanuël; Raymond, Sean N.; Selsis, Franck; Triaud, Amaury H. M. J.; Barclay, Thomas; Barentsen, Geert; Howell, Steve B.; ... (2017). A seven-planet resonant chain in TRAPPIST-1. Nature astronomy, 1(6), 0129. Nature Publishing Group 10.1038/s41550-017-0129

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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 18.77 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 0.727 Earth radii and an equilibrium temperature of 173 K. We have also measured the rotational period of the star at 3.3 d and detected a number of flares consistent with a low-activity, middle-aged, late M dwarf.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Center for Space and Habitability (CSH)
08 Faculty of Science > Physics Institute

UniBE Contributor:

Sestovic, Marko and Demory, Brice-Olivier

Subjects:

500 Science > 530 Physics
500 Science > 520 Astronomy

ISSN:

2397-3366

Publisher:

Nature Publishing Group

Language:

English

Submitter:

Simon Grimm

Date Deposited:

20 Apr 2018 13:25

Last Modified:

22 Apr 2018 02:23

Publisher DOI:

10.1038/s41550-017-0129

BORIS DOI:

10.7892/boris.113578

URI:

https://boris.unibe.ch/id/eprint/113578

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