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Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1

Michaël Gillon 1 Amaury H. M. J. Triaud 2 Brice-Olivier Demory 3, 4 Emmanuël Jehin 1 Eric Agol 5, 6 Katherine M. Deck 7 Susan M. Lederer 8 Julien de Wit 9 Artem Burdanov 1 James G. Ingalls 10 Emeline Bolmont 11, 12 J. Leconte 13 Sean N. Raymond 14 Franck Selsis 13 Martin Turbet 15 Khalid Barkaoui 16 Adam Burgasser 17 Matthew R. Burleigh 18 Sean J. Carey 10 Aleksander Chaushev 18 Chris M. Copperwheat 19 Laetitia Delrez 1, 4 Catarina S. Fernandes 20, 1 Daniel L. Holdsworth 21 Enrico J. Kotze 22 Valérie van Grootel 1 Yaseen Almleaky 23 Zouhair Benkhaldoun 16 Pierre Magain 1 Didier Queloz 24, 4
Abstract : One aim of modern astronomy is to detect temperate, Earth-like exoplanets that are well suited for atmospheric characterization. Recently, three Earth-sized planets were detected that transit (that is, pass in front of) a star with a mass just eight per cent that of the Sun, located 12 parsecs away. The transiting configuration of these planets, combined with the Jupiter-like size of their host star—named TRAPPIST-1—makes possible in-depth studies of their atmospheric properties with present-day and future astronomical facilities. Here we report the results of a photometric monitoring campaign of that star from the ground and space. Our observations reveal that at least seven planets with sizes and masses similar to those of Earth revolve around TRAPPIST-1. The six inner planets form a near-resonant chain, such that their orbital periods (1.51, 2.42, 4.04, 6.06, 9.1 and 12.35 days) are near-ratios of small integers. This architecture suggests that the planets formed farther from the star and migrated inwards. Moreover, the seven planets have equilibrium temperatures low enough to make possible the presence of liquid water on their surfaces.
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Michaël Gillon, Amaury H. M. J. Triaud, Brice-Olivier Demory, Emmanuël Jehin, Eric Agol, et al.. Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1. Nature, Nature Publishing Group, 2017, 542 (7642), pp.456 - 460. ⟨10.1038/nature21360⟩. ⟨hal-01481244⟩

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