Journal
ASTROPHYSICAL JOURNAL
Volume 701, Issue 1, Pages 514-520Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/701/1/514
Keywords
binaries: eclipsing; infrared: stars; planetary systems; stars: individual (XO-2)
Categories
Funding
- Spitzer Science Center [C4030]
- NASA [NNX07AG80G]
- JPL/Spitzer [1328092, 1348668, 1312647]
- National Aeronautics and Space Administration
- National Science Foundation
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We estimate flux ratios of the extrasolar planet XO-2b to its host star XO-2 at 3.6, 4.5, 5.8, and 8.0 mu m with Infrared Array Camera on the Spitzer Space Telescope to be 0.00081 +/- 0.00017, 0.00098 +/- 0.00020, 0.00167 +/- 0.00036, and 0.00133 +/- 0.00049, respectively. The fluxes provide tentative evidence for a weak temperature inversion in the upper atmosphere, the precise nature of which would need to be confirmed by longer wavelength observations. XO-2b substellar flux of 0.76 x 10(9) erg cm(-2) s(-1) lies in the predicted transition region between atmospheres with and without upper atmospheric temperature inversion.
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