Ks-band Detection of Thermal Emission and Color Constraints to the Hot Jupiter CoRoT-1b

Details Ks-band Detection of Thermal Emission and Color Constraints to the Hot Jupiter CoRoT-1b Ks-band Detection of Thermal Emission and Color Constraints to the Hot Jupiter CoRoT-1b

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21532808r&link_type=abstract

American Astronomical Society, AAS Meeting #215, #328.08; Bulletin of the American Astronomical Society, Vol. 42, p.426

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We report the detection in Ks-band of the secondary eclipse of the hot Jupiter CoRoT-1b, from time series photometry with the ARC 3.5-m telescope at Apache Point Observatory. The eclipse shows a depth of 0.336 +/- 0.042 percent, and is centered at a phase consistent with a circular orbit. We then perform the first optical to near-infrared multi-band photometric analysis of an exoplanet's atmosphere by combining our result with the recent 0.6, 0.71, and 2.09 micron eclipse detections by Snellen et al. (2009), Gillon et al. (2009), and Alonso et al. (2009). Comparing the multi-wavelength detections to state-of-the-art radiative-convective chemical equilibrium atmosphere models, we find the near-infrared fluxes difficult to reproduce. The best physical model suggests a thermal inversion layer with an extra optical absorber of opacity kappae = 0.05 cm2 g-1 placed near the 0.1-bar atmospheric pressure level, ten times deeper in the atmosphere than the absorbers used in models to fit mid-infrared Spitzer detections of other irradiated hot Jupiters. We also present and discuss preliminary results from secondary eclipse observations of other planets.
We are grateful for the critical support provided by the Space Telescope Science Institute Director's Discretionary Research Fund D0101.90131, Hubble Fellowship grant HF-01210.01-A, CNES, NASA grant NNX07AG80G, and National Science Foundation grant AST-0908278.

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