Rapid heating of the atmosphere of an extrasolar planet

Gregory Laughlin (), Drake Deming, Jonathan Langton, Daniel Kasen, Steve Vogt, Paul Butler, Eugenio Rivera and Stefano Meschiari
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Gregory Laughlin: UCO/Lick Observatory, University of California, Santa Cruz, California 95064, USA
Drake Deming: NASA/Goddard Space Flight Center, Planetary Systems Branch, Code 693, Greenbelt, Maryland 20771, USA
Jonathan Langton: UCO/Lick Observatory, University of California, Santa Cruz, California 95064, USA
Daniel Kasen: UCO/Lick Observatory, University of California, Santa Cruz, California 95064, USA
Steve Vogt: UCO/Lick Observatory, University of California, Santa Cruz, California 95064, USA
Paul Butler: Carnegie Institute of Washington, 5241 Broad Branch Road, NW, Washington DC 20015, USA
Eugenio Rivera: UCO/Lick Observatory, University of California, Santa Cruz, California 95064, USA
Stefano Meschiari: UCO/Lick Observatory, University of California, Santa Cruz, California 95064, USA

Nature, 2009, vol. 457, issue 7229, 562-564

Abstract: How hot a Jupiter? The weather on HD 80606b Many 'hot Jupiter' extrasolar planets are known. Their properties vary, but virtually all are thought to be spin-synchronized, so that the same hemisphere faces the parent star at all times. HD 80606b breaks that mould. It is a hot Jupiter with an extremely eccentric orbit and is not spin-synchronized. This makes it a tempting target for observation: the planet experiences a near-1,000-fold increase in heating at periastron, its closest brush with the host star. Observations at periastron using the Spitzer Space Telescope provide a first glimpse of time-varying 'weather' on an extrasolar planet. Its 8-µm (near-infrared) brightness temperature rose from 800 to 1,500 K in six hours. The detection of a secondary eclipse helped fix the planetary mass at about four times that of Jupiter.

Date: 2009
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DOI: 10.1038/nature07649

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