A seven-planet resonant chain in TRAPPIST-1

22 May 2017 · 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., Delrez Laetitia, de Wit Julien, Foreman-Mackey Daniel, Holdsworth Daniel L., Leconte Jérémy, Lederer Susan, Turbet Martin, Almleaky Yaseen, Benkhaldoun Zouhair, Magain Pierre, Morris Brett, Heng Kevin, Queloz Didier ·

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.

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A seven-planet resonant chain in TRAPPIST-1

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