Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Statistics of Albedo and Heat Recirculation on Hot Exoplanets   [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, 0<A_B<1, as
well as its day-night heat redistribution efficiency, 0<epsilon<1. We attempt a
statistical analysis of the albedo and redistribution efficiency for 24
transiting exoplanets that have at least one published secondary eclipse. For
each planet, we show how to calculate a sub-stellar equilibrium temperature,
T_0, and associated uncertainty. We then use a simple model-independent
technique to estimate a planet's effective temperature from planet/star flux
ratios. We use thermal secondary eclipse measurements -those obtained at
lambda>0.8 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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The categories of this paper are: stat
2
The categories of this paper are: math
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom