Karen Horning

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Of the over 200 known extrasolar planets, 14 exhibit transits in front of their parent stars as seen from Earth. Spectroscopic observations of the transiting planets can probe the physical conditions of their atmospheres. One such technique can be used to derive the planetary spectrum by subtracting the stellar spectrum measured during eclipse (planet(More)
We report the results of infrared (8 µm) transit and secondary eclipse pho-tometry of the hot Neptune exoplanet, GJ 436b using Spitzer. The nearly photon-limited precision of these data allow us to measure an improved radius for the planet, and to detect the secondary eclipse. The transit (centered at HJD = 2454280.78149 ± 0.00016) shows the flat-bottomed(More)
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