A map of the day–night contrast of the extrasolar planet HD 189733b

Heather A. Knutson (), David Charbonneau, Lori E. Allen, Jonathan J. Fortney, Eric Agol, Nicolas B. Cowan, Adam P. Showman, Curtis S. Cooper and S. Thomas Megeath
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Heather A. Knutson: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
David Charbonneau: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
Lori E. Allen: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
Jonathan J. Fortney: NASA Ames Research Center, MS 245-3, Moffett Field, California 94035, USA
Eric Agol: Box 351580, University of Washington, Seattle, Washington 98195, USA
Nicolas B. Cowan: Box 351580, University of Washington, Seattle, Washington 98195, USA
Adam P. Showman: University of Arizona, Tucson, Arizona 85721, USA
Curtis S. Cooper: University of Arizona, Tucson, Arizona 85721, USA
S. Thomas Megeath: University of Toledo, 2801 West Bancroft Street, Toledo, Ohio 43606, USA

Nature, 2007, vol. 447, issue 7141, 183-186

Abstract: 'Hot Jupiters' just got hotter 'Hot Jupiter' extrasolar planets are close to their parent stars, so are likely to be tidally locked (like the Earth and Moon), with permanent day and night sides. That raises the question of whether the atmosphere is able to transport energy from the day side to the night side. Infrared data from the Spitzer Space Telescope have now answered that question for the extrasolar planet HD 189733b. Night and day temperatures are similar, around 950–1,200 K, indicating that energy from the irradiated side is efficiently redistributed throughout the atmosphere. A paper going live online this week reports observations of the atmosphere of the extra-solar plant HD 149026b. It’s a very hot Jupiter, the hottest planet known, at about 2,300 K. This matches predictions for a planet where each patch of surface area instantaneously re-emits all absorbed light as a blackbody.

Date: 2007
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DOI: 10.1038/nature05782

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