Reference : Atmospheric reconnaissance of the habitable-zone Earth-sized planets orbiting TRAPPIST-1
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/229258
Atmospheric reconnaissance of the habitable-zone Earth-sized planets orbiting TRAPPIST-1
English
De Wit, J. mailto [Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States]
Wakeford, H. R. [Astrophysics Group, University of Exeter, Devon, United Kingdom, Space Telescope Science Institute, Baltimore, MD, United States]
Lewis, N. K. [Space Telescope Science Institute, Baltimore, MD, United States]
Delrez, L. [Astrophysics Group, Cavendish Laboratory, Cambridge, United Kingdom]
Gillon, Michaël mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Selsis, F. [Laboratoire d'Astrophysique de Bordeaux, Univ. Bordeaux, CNRS, Pessac, France]
Leconte, J. [Laboratoire d'Astrophysique de Bordeaux, Univ. Bordeaux, CNRS, Pessac, France]
Demory, B.-O. [University of Bern, Center for Space and Habitability, Bern, Switzerland]
Bolmont, E. [Astrophysics Division of CEA de Saclay, Gif-sur-Yvette, France]
Bourrier, V. [Observatoire de l'Université de Genève, Sauverny, Switzerland]
Burgasser, A. J. [Center for Astrophysics and Space Science, University of California, San Diego, San Diego, CA, United States]
Grimm, S. [University of Bern, Center for Space and Habitability, Bern, Switzerland]
Jehin, Emmanuel mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Lederer, S. M. [NASA Johnson Space Center, Houston, TX, United States]
Owen, J. E. [Astrophysics Group, Imperial College London, Blackett Laboratory, London, United Kingdom]
Stamenković, V. [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States]
Triaud, A. H. M. J. [School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom]
2018
Nature Astronomy
Nature Publishing Group
2
3
214-219
Yes (verified by ORBi)
International
23973366
[en] Seven temperate Earth-sized exoplanets readily amenable for atmospheric studies transit the nearby ultracool dwarf star TRAPPIST-1 (refs 1,2 ). Their atmospheric regime is unknown and could range from extended primordial hydrogen-dominated to depleted atmospheres 3-6 . Hydrogen in particular is a powerful greenhouse gas that may prevent the habitability of inner planets while enabling the habitability of outer ones 6-8 . An atmosphere largely dominated by hydrogen, if cloud-free, should yield prominent spectroscopic signatures in the near-infrared detectable during transits. Observations of the innermost planets have ruled out such signatures 9 . However, the outermost planets are more likely to have sustained such a Neptune-like atmosphere 10, 11 . Here, we report observations for the four planets within or near the system's habitable zone, the circumstellar region where liquid water could exist on a planetary surface 12-14 . These planets do not exhibit prominent spectroscopic signatures at near-infrared wavelengths either, which rules out cloud-free hydrogen-dominated atmospheres for TRAPPIST-1 d, e and f, with significance of 8σ, 6σ and 4σ, respectively. Such an atmosphere is instead not excluded for planet g. As high-altitude clouds and hazes are not expected in hydrogen-dominated atmospheres around planets with such insolation 15, 16, these observations further support their terrestrial and potentially habitable nature. © 2018 The Author(s).
http://hdl.handle.net/2268/229258
10.1038/s41550-017-0374-z

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
1802.02250.pdfAuthor preprint17.68 MBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.