A combined transmission spectrum of the Earth-sized exoplanets TRAPPIST-1 b and c

Julien de Wit (), Hannah R. Wakeford, Michaël Gillon, Nikole K. Lewis, Jeff A. Valenti, Brice-Olivier Demory, Adam J. Burgasser, Artem Burdanov, Laetitia Delrez, Emmanuël Jehin, Susan M. Lederer, Didier Queloz, Amaury H. M. J. Triaud and Valérie Van Grootel
Additional contact information
Julien de Wit: Atmospheric and Planetary Sciences, Massachusetts Institute of Technology
Hannah R. Wakeford: NASA Goddard Space Flight Center
Michaël Gillon: Institut d’Astrophysique et de Géophysique, Université de Liège
Nikole K. Lewis: Space Telescope Science Institute
Jeff A. Valenti: Space Telescope Science Institute
Brice-Olivier Demory: Astrophysics Group, Cavendish Laboratory
Adam J. Burgasser: Center for Astrophysics and Space Science, University of California San Diego
Artem Burdanov: Institut d’Astrophysique et de Géophysique, Université de Liège
Laetitia Delrez: Institut d’Astrophysique et de Géophysique, Université de Liège
Emmanuël Jehin: Institut d’Astrophysique et de Géophysique, Université de Liège
Susan M. Lederer: NASA Johnson Space Center
Didier Queloz: Astrophysics Group, Cavendish Laboratory
Amaury H. M. J. Triaud: Institute of Astronomy
Valérie Van Grootel: Institut d’Astrophysique et de Géophysique, Université de Liège

Nature, 2016, vol. 537, issue 7618, 69-72

Abstract: Two exoplanet atmospheres examined This paper reports Hubble Space Telescope observations of the inner two of three Earth-sized exoplanets that were recently discovered close to the habitable zone of the nearby ultracool dwarf star TRAPPIST-1. The combined transmission spectrum of TRAPPIST-1 b and c was obtained during their simultaneous transits on 4 May 2016. The lack of features in the combined spectrum effectively rules out cloud-free hydrogen-dominated atmospheres for each planet, but they could have a variety of other types of atmosphere, from one consisting mainly of cloud-free water vapour to a Venus-like atmosphere.

Date: 2016
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DOI: 10.1038/nature18641

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