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

Gillon, M and Triaud, AHMJ and Demory, B-O and Jehin, E and Agol, E and Deck, KM and Lederer, SM and de Wit, J and Burdanov, A and Ingalls, JG and Bolmont, E and Leconte, J and Raymond, SN and Selsis, F and Turbet, M and Barkaoui, K and Burgasser, A and Burleigh, MR and Carey, SJ and Chaushev, A and Copperwheat, CM and Delrez, L and Fernandes, CS and Holdsworth, DL and Kotze, EJ and Van Grootel, V and Almleaky, Y and Benkhaldoun, Z and Magain, P and Queloz, D (2017) Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1. Nature, 542 (7642). pp. 456-460. ISSN 0028-0836

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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 away1. 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.

Item Type: Article
Uncontrolled Keywords: MD Multidisciplinary
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Nature Publishing Group
Related URLs:
Date Deposited: 11 May 2017 11:36
Last Modified: 06 Sep 2017 15:45
DOI or Identification number: 10.1038/nature21360
URI: http://researchonline.ljmu.ac.uk/id/eprint/6410

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