1. 3.6 AND 4.5 mu m SPITZER PHASE CURVES OF THE HIGHLY IRRADIATED HOT JUPITERS WASP-19b AND HAT-P-7b
- Author
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Wong, Ian, Knutson, Heather A, Kataria, Tiffany, Lewis, Nikole K, Burrows, Adam, Fortney, Jonathan J, Schwartz, Joel, Shporer, Avi, Agol, Eric, Cowan, Nicolas B, Deming, Drake, Desert, Jean-Michel, Fulton, Benjamin J, Howard, Andrew W, Langton, Jonathan, Laughlin, Gregory, Showman, Adam P, and Todorov, Kamen
- Subjects
planetary systems ,stars: individual ,techniques: photometric ,astro-ph.EP ,Astronomy & Astrophysics ,Astronomical and Space Sciences ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Physical Chemistry ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Physical Chemistry (incl. Structural) - Abstract
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 ($
- Published
- 2016