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Kepler-13Ab (= KOI-13.01) is a unique transiting hot Jupiter. It is one ofvery few known short-period planets orbiting a hot A-type star, making it oneof the hottest planets currently known. The availability of Kepler data allowsus to measure the planet's occultation (secondary eclipse) and phase curve inthe optical, which we combine with occultations observed by warm Spitzer at 4.5mic and 3.6 mic and a ground-based occultation observation in the Ks band (2.1mic). We derive a day-side hemisphere temperature of 2,750 +- 160 K as theeffective temperature of a black body showing the same occultation depths.Comparing the occultation depths with one-dimensional planetary atmospheremodels suggests the presence of an atmospheric temperature inversion. Ouranalysis shows evidence for a relatively high geometric albedo, Ag= 0.33 +0.04-0.06. While measured with a simplistic method, a high Ag is supported also bythe fact that the one-dimensional atmosphere models underestimate theoccultation depth in the optical. We use stellar spectra to determine thedilution, in the four wide bands where occultation was measured, due to thevisual stellar binary companion 1.15 +- 0.05" away. The revised stellarparameters measured using these spectra are combined with other measurementsleading to revised planetary mass and radius estimates of Mp = 4.94 - 8.09 Mjupand Rp = 1.406 +- 0.038 Rjup. Finally, we measure a Kepler mid-occultation timethat is 34.0 +- 6.9 s earlier than expected based on the mid-transit time andthe delay due to light travel time, and discuss possible scenarios.

Atmospheric Characterization of the Hot Jupiter Kepler-13Ab