부산대학교 도서관

We analyze full-orbit phase curve observations of the transiting hot JupitersWASP-19b and HAT-P-7b at 3.6 and 4.5 $\mu$m obtained using the Spitzer SpaceTelescope. For WASP-19b, we measure secondary eclipse depths of $0.485\%\pm0.024\%$ and $0.584\%\pm 0.029\%$ at 3.6 and 4.5 $\mu$m, which are consistentwith a single blackbody with effective temperature $2372 \pm 60$ K. Themeasured 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 asingle blackbody with effective temperature $2667\pm 57$ K. Comparing the phasecurves to the predictions of one-dimensional and three-dimensional atmosphericmodels, we find that WASP-19b's dayside emission is consistent with a modelatmosphere with no dayside thermal inversion and moderately efficient day-nightcirculation. We also detect an eastward-shifted hotspot, suggesting thepresence of a superrotating equatorial jet. In contrast, HAT-P-7b's daysideemission suggests a dayside thermal inversion and relatively inefficientday-night circulation; no hotspot shift is detected. For both planets, thesesame models do not agree with the measured nightside emission. Thediscrepancies in the model-data comparisons for WASP-19b might be explained byhigh-altitude silicate clouds on the nightside and/or high atmosphericmetallicity, while the very low 3.6 $\mu$m nightside planetary brightness forHAT-P-7b may be indicative of an enhanced global C/O ratio. We compute Bondalbedos of 0 ($