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We report the detection of thermal emission at 4.5 and 8 μm from the planet WASP‐17b. We used Spitzer to measure the system brightness at each wavelength during two occultations of the planet by its host star. By combining the resulting light curves with existing transit light curves and radial‐velocity measurements in a simultaneous analysis, we find the radius of WASP‐17b to be 2.0RJup, which is...
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