A giant comet-like cloud of hydrogen escaping the warm Neptune-mass exoplanet GJ 436b

David Ehrenreich (), Vincent Bourrier, Peter J. Wheatley, Alain Lecavelier des Etangs, Guillaume Hébrard, Stéphane Udry, Xavier Bonfils, Xavier Delfosse, Jean-Michel Désert, David K. Sing and Alfred Vidal-Madjar
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David Ehrenreich: Observatoire de l’Université de Genève
Vincent Bourrier: Observatoire de l’Université de Genève
Peter J. Wheatley: University of Warwick
Alain Lecavelier des Etangs: CNRS, UMR 7095, Institut d’Astrophysique de Paris
Guillaume Hébrard: CNRS, UMR 7095, Institut d’Astrophysique de Paris
Stéphane Udry: Observatoire de l’Université de Genève
Xavier Bonfils: Univ. Grenoble Alpes, IPAG
Xavier Delfosse: Univ. Grenoble Alpes, IPAG
Jean-Michel Désert: CASA, University of Colorado, 389-UCB
David K. Sing: Astrophysics Group, School of Physics, University of Exeter
Alfred Vidal-Madjar: CNRS, UMR 7095, Institut d’Astrophysique de Paris

Nature, 2015, vol. 522, issue 7557, 459-461

Abstract: In the ultraviolet spectrum, the Neptune-mass exoplanet GJ 436b is shown to have transit depths far greater than those seen in the optical spectrum, indicating that it is surrounded and trailed by a large cloud composed mainly of hydrogen atoms.

Date: 2015
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DOI: 10.1038/nature14501

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