Hot Jovian Nights: Understanding the Nightsides of Hot Jupiters

Nightside temperatures on hot Jupiters are neither well constrained nor physically well understood yet, and usually colder than predicted by general circulation models. Additionally, there are several hot Jupiters, like WASP-43b, whose published full-orbit phase curves imply negative planetary flux on the nightside. The system looks fainter immediately before and after transit than it would look if there were no planet at all, which is likely due to poor decorrelation and not physical. Observations should be fit by demanding that phase curves and brightness maps are non-negative; in certain cases, unphysical brightness maps can be fixed by doctoring the maps or invoking odd sinusoidal modes. This has the tendency to increase nightside temperatures and decrease dayside temperatures, reducing the temperatures differences. In my talk, I will describe how I invert published phase curves into longitudinally resolved brightness maps and construct two-dimensional, bolometric flux maps for all hot Jupiters with full-orbit infrared phase curves. I will discuss the trends found in dayside and nightside effective temperatures, Bond albedos, and day-night heat recirculation fractions for these planets, and I will compare the nightside temperatures to what we expect from analytic models.

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