Atmosphere and Spectral Models of the Kepler-Field Planets HAT-P-7b and TrES-2

Details Atmosphere and Spectral Models of the Kepler-Field Planets HAT-P-7b and TrES-2 Atmosphere and Spectral Models of the Kepler-Field Planets HAT-P-7b and TrES-2

2010-06-08

arxiv.org/abs/1006.1660v2

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

Figures, references, and text slightly updated. Accepted by ApJ

Scientific paper

We develop atmosphere models of two of the three Kepler-field planets that were known prior to the start of the Kepler mission (HAT-P-7b and TrES-2). We find that published Kepler and Spitzer data for HAT-P-7b appear to require an extremely hot upper atmosphere on the dayside, with a strong thermal inversion and little day-night redistribution. The Spitzer data for TrES-2 suggest a mild thermal inversion with moderate day-night redistribution. We examine the effect of nonequilibrium chemistry on TrES-2 model atmospheres and find that methane levels must be adjusted by extreme amounts in order to cause even mild changes in atmospheric structure and emergent spectra. Our best-fit models to the Spitzer data for TrES-2 lead us to predict a low secondary eclipse planet-star flux ratio (~2 x 10^-5) in the Kepler bandpass, which is consistent with what very recent observations have found. Finally, we consider how the Kepler-band optical flux from a hot exoplanet depends on the strength of a possible extra optical absorber in the upper atmosphere. We find that the optical flux is not monotonic in optical opacity, and the non-monotonicity is greater for brighter, hotter stars.

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