Water vapour in the atmosphere of a transiting extrasolar planet

Giovanna Tinetti (), Alfred Vidal-Madjar, Mao-Chang Liang, Jean-Philippe Beaulieu, Yuk Yung, Sean Carey, Robert J. Barber, Jonathan Tennyson, Ignasi Ribas, Nicole Allard, Gilda E. Ballester, David K. Sing and Franck Selsis
Additional contact information
Giovanna Tinetti: European Space Agency, Frascati 00044, Italy
Alfred Vidal-Madjar: Institut d’Astrophysique de Paris, CNRS, Université Pierre et Marie Curie, 75014 Paris, France
Mao-Chang Liang: Division of Geological and Planetary Sciences,
Jean-Philippe Beaulieu: Institut d’Astrophysique de Paris, CNRS, Université Pierre et Marie Curie, 75014 Paris, France
Yuk Yung: Division of Geological and Planetary Sciences,
Sean Carey: IPAC-Spitzer Science Center, California Institute of Technology, Pasadena, California 91125, USA
Robert J. Barber: University College London, Gower Street, London WC1E 6BT, UK
Jonathan Tennyson: University College London, Gower Street, London WC1E 6BT, UK
Ignasi Ribas: Institut de Ciències de l’Espai (CSIC-IEEC), Campus UAB, 08193 Bellaterra, Spain
Nicole Allard: Institut d’Astrophysique de Paris, CNRS, Université Pierre et Marie Curie, 75014 Paris, France
Gilda E. Ballester: Lunar and Planetary Laboratory, University of Arizona, Tucson, 85721-0063, Arizona, USA
David K. Sing: Institut d’Astrophysique de Paris, CNRS, Université Pierre et Marie Curie, 75014 Paris, France
Franck Selsis: Ecole Normale Supérieure, CNRS, 69364 Lyon, France

Nature, 2007, vol. 448, issue 7150, 169-171

Abstract: A hint of water Over 200 planets have been detected orbiting stars other than the Sun. Many are 'hot Jupiters', giant extrasolar planets that orbit close in to their star, yet despite theorists predicting abundant water in the atmosphere of such planets, evidence for it has so far been equivocal. Now Tinetti et al. have obtained convincing evidence that one hot Jupiter at least does contain water vapour in its atmosphere. Planet HD 189733b was observed in the infrared as it passed in front of its parent star. The observed variations in apparent radius at different wavelengths are best explained as a result of absorption by water vapour.

Date: 2007
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DOI: 10.1038/nature06002

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