Detection of Thermal Emission of XO-2b: Evidence for a Weak Temperature Inversion

Details Detection of Thermal Emission of XO-2b: Evidence for a Weak Temperature Inversion Detection of Thermal Emission of XO-2b: Evidence for a Weak Temperature Inversion

2009-06-06

arxiv.org/abs/0906.1293v1

Astrophys.J.701:514-520,2009

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

17 pages. Accepted for publication in The Astrophysical Journal

Scientific paper

10.1088/0004-637X/701/1/514

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 micron with IRAC 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 ergs cm^-2 s^-1 lies in the predicted transition region between atmospheres with and without upper atmospheric temperature inversion.

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