The Statistics of Albedo and Heat Recirculation on Hot Exoplanets

Details The Statistics of Albedo and Heat Recirculation on Hot Exoplanets The Statistics of Albedo and Heat Recirculation on Hot Exoplanets

2009-12-30

arxiv.org/abs/1001.0012v2

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

12 pages, 7 figures, ApJ accepted. Substantial Changes: more planets and data, refined analysis, different conclusions

Scientific paper

10.1088/0004-637X/729/1/54

[Abridged] If both the day-side and night-side effective temperatures of a planet can be measured, it is possible to estimate its Bond albedo, 00.8 micron- to estimate day-side effective temperatures, T_d, and thermal phase variations -when available- to estimate night-side effective temperature. We strongly rule out the "null hypothesis" of a single A_B and epsilon for all 24 planets. If we allow each planet to have different parameters, we find that low Bond albedos are favored (A_B<0.35 at 1 sigma confidence), which is an independent confirmation of the low albedos inferred from non-detection of reflected light. Our sample exhibits a wide variety of redistribution efficiencies. When normalized by T_0, the day-side effective temperatures of the 24 planets describe a uni-modal distribution. The dimensionless quantity T_d/T_0 exhibits no trend with the presence or absence of stratospheric inversions. There is also no clear trend between T_d/T_0 and T_0. That said, the 6 planets with the greatest sub-stellar equilibrium temperatures (T>2400 K) have low epsilon, as opposed to the 18 cooler planets, which show a variety of recirculation efficiencies. This hints that the very hottest transiting giant planets are qualitatively different from the merely hot Jupiters.

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