The presence of methane in the atmosphere of an extrasolar planet

Mark R. Swain (), Gautam Vasisht and Giovanna Tinetti
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Mark R. Swain: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA
Gautam Vasisht: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA
Giovanna Tinetti: University College London, Gower Street, London WC1E 6BT, UK

Nature, 2008, vol. 452, issue 7185, 329-331

Abstract: Methane in a 'hot Jupiter' Theorists predict the presence of water, methane and carbon monoxide in the atmospheres of 'hot Jupiter' extrasolar planets, and last year, analysis of infrared observations obtained as planet HD 189733b passed in front of its parent star provided indirect evidence for the presence of water. Now near-infrared transmission spectroscopy confirms the presence of water and large amounts of methane on HD 189733b. But not the expected carbon monoxide, perhaps due to photochemical enhancement of methane production or chemical gradients in the atmosphere.

Date: 2008
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DOI: 10.1038/nature06823

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