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• W2013127072 abstract "We have analyzed Warm Spitzer/IRAC observations of the secondary eclipses of three planets, XO-4b, HAT-P-6b and HAT-P-8b. We measure secondary eclipse amplitudes at 3.6{mu}m and 4.5{mu}m for each target. XO-4b exhibits a stronger eclipse depth at 4.5{mu}m than at 3.6{mu}m, which is consistent with the presence of a temperature inversion. HAT-P-8b shows a stronger eclipse amplitude at 3.6{mu}m, and is best-described by models without a temperature inversion. The eclipse depths of HAT-P-6b can be fitted with models with a small or no temperature inversion. We consider our results in the context of a postulated relationship between stellar activity and temperature inversions and a relationship between irradiation level and planet dayside temperature, as discussed by Knutson et al. (2010) and Cowan & Agol (2011), respectively. Our results are consistent with these hypotheses, but do not significantly strengthen them. To measure accurate secondary eclipse central phases, we require accurate ephemerides. We obtain primary transit observations and supplement them with publicly available observations to update the orbital ephemerides of the three planets. Based on the secondary eclipse timing, we set upper boundaries for e cos(omega) for HAT-P-6b, HAT-P-8b and XO-4b and find that the values are consistent with circular orbits." @default.
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• W2013127072 date "2012-01-27" @default.
• W2013127072 modified "2023-10-14" @default.
• W2013127072 title "WARM<i>SPITZER</i>OBSERVATIONS OF THREE HOT EXOPLANETS: XO-4b, HAT-P-6b, AND HAT-P-8b" @default.
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• W2013127072 doi "https://doi.org/10.1088/0004-637x/746/1/111" @default.
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