Two Secondary Eclipses of HAT-P-7b in Four Wavelengths

Astronomy and Astrophysics – Astronomy

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We observed two secondary eclipses of the transiting exoplanet HAT-P-7b, which resides in the Kepler field of view. These observations were made using the Infrared Array Camera on the Spitzer Space Telescope. HAT-P-7b is a hot Jupiter that lies approximately 0.04 AU from its parent star. It has an approximately circular orbit and an equilibrium temperature of 2730K assuming immediate re-radiation of incident flux and 0 Bond albedo. We observed an eclipse of this planet at 3.6 and 5.8 µm on 28 October 2008 and at 4.5 and 8 µm on 30 October 2008. We will present estimates of infrared brightness temperatures and the use of a preflash to stabilize detector levels prior to observing the event. A companion talk by Hardy et al. will provide constraints on the eccentricity and argument of periapsis due to the precise phase of secondary eclipse.
These observations are part of the Spitzer Exoplanet Target of Opportunity program, which observes eclipses and transits of new exoplanets. Spitzer is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA, which provided support for this work.

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