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Abstract: We present the results of recent observations of phase-dependent variationsin brightness designed to characterize the atmospheres of hot Jupiters. Inparticular, we focus on recent observations of the transiting planet HD 189733bat 8 micron using the Spitzer Space Telescope, which allow us to determine theefficiency of the day-night circulation on this planet and estimate thelongitudinal positions of hot and cold regions in the atmosphere. We discussthe implications of these observations in the context of two other successfuldetections of more sparsely-sampled phase variations for the non-transitingsystems upsilon And b and HD 179949b, which imply a potential diversity in theproperties of the atmospheres of hot Jupiters. Lastly, we highlight severalupcoming Spitzer observations that will extend this sample to additionalwavelengths and more transiting systems in the near future.

Author: H. A. Knutson


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