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

Author

Listed:
  • 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)

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.

Suggested Citation

  • 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. Ledere, 2016. "A combined transmission spectrum of the Earth-sized exoplanets TRAPPIST-1 b and c," Nature, Nature, vol. 537(7618), pages 69-72, September.
    • Handle: RePEc:nat:nature:v:537:y:2016:i:7618:d:10.1038_nature18641
    DOI: 10.1038/nature18641
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