Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comet-like tails of disintegrating exoplanets explained by escaping
  outflows emanated from the permanent nightside: day-side versus night-side
  escape   Ultra-hot disintegrating exoplanets have been detected with tails trailing
behind and/or shooting ahead of them. These tails are believed to be made of
dusts that are carried upward by the supersonic flow escaping the planet's
gravity field from the fiercely heated permanent day-side. Conserving angular
momentum, this day-side escape flux would lead the planet in orbit. In order to
explain the trailing tails in observation, radiation pressure, a repulsive
force pushing the escape flow away from the host star is considered to be
necessary.
  We here investigate whether escape could occur on the night-side as the
escape flow is deflected by the pressure gradient force. We demonstrate in an
idealized framework that escape flux from the night-side could dominate that
from the day-side; and the former may naturally explain the commonly-observed
trailing tails based on angular momentum conservation, without the need to
invoke radiation pressure, which has previously been thought to be the key. We
also find analytical approximations for both dayside and nightside escape
fluxes, which may be applied to study planetary evolution of disintegrating
planets and to infer planetary sizes from observations of the properties of
their dusty tails.

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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: adap-org
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
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The categories of this paper are: math
35
The categories of this paper are: mtrl-th