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• W2214954459 abstract "We analyze full-orbit phase curve observations of the transiting hot Jupiters WASP-19b and HAT-P-7b at 3.6 and 4.5 $mu$m obtained using the Spitzer Space Telescope. For WASP-19b, we measure secondary eclipse depths of $0.485%pm 0.024%$ and $0.584%pm 0.029%$ at 3.6 and 4.5 $mu$m, which are consistent with a single blackbody with effective temperature $2372 pm 60$ K. The measured 3.6 and 4.5 $mu$m secondary eclipse depths for HAT-P-7b are $0.156%pm 0.009%$ and $0.190%pm 0.006%$, which are well-described by a single blackbody with effective temperature $2667pm 57$ K. Comparing the phase curves to the predictions of one-dimensional and three-dimensional atmospheric models, we find that WASP-19b's dayside emission is consistent with a model atmosphere with no dayside thermal inversion and moderately efficient day-night circulation. We also detect an eastward-shifted hotspot, suggesting the presence of a superrotating equatorial jet. In contrast, HAT-P-7b's dayside emission suggests a dayside thermal inversion and relatively inefficient day-night circulation; no hotspot shift is detected. For both planets, these same models do not agree with the measured nightside emission. The discrepancies in the model-data comparisons for WASP-19b might be explained by high-altitude silicate clouds on the nightside and/or high atmospheric metallicity, while the very low 3.6 $mu$m nightside planetary brightness for HAT-P-7b may be indicative of an enhanced global C/O ratio. We compute Bond albedos of 0 ($<0.08$ at $1sigma$) and $0.38pm 0.06$ for WASP-19b and HAT-P-7b, respectively. In the context of other planets with thermal phase curve measurements, we show that WASP-19b and HAT-P-7b fit the general trend of decreasing day-night heat recirculation with increasing irradiation." @default.
• W2214954459 created "2016-06-24" @default.
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• W2214954459 date "2016-05-27" @default.
• W2214954459 modified "2023-10-14" @default.
• W2214954459 title "3.6 AND 4.5<i>μ</i>m<i>SPITZER</i>PHASE CURVES OF THE HIGHLY IRRADIATED HOT JUPITERS WASP-19b AND HAT-P-7b" @default.
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