Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Directly Imaging Tidally Powered Migrating Jupiters   Upcoming direct-imaging experiments may detect a new class of long-period,
highly luminous, tidally powered extrasolar gas giants. Even though they are
hosted by ~ Gyr-"old" main-sequence stars, they can be as "hot" as young
Jupiters at ~100 Myr, the prime targets of direct-imaging surveys. They are on
years-long orbits and presently migrating to "feed" the "hot Jupiters." They
are expected from "high-e" migration mechanisms, in which Jupiters are excited
to highly eccentric orbits and then shrink semi-major axis by a factor of
~10-100 due to tidal dissipation at close periastron passages. The dissipated
orbital energy is converted to heat, and if it is deposited deep enough into
the atmosphere, the planet likely radiates steadily at luminosity L ~ 100-1000
L_Jup(2 x 10-7-2 x 10-6 L_Sun) during a typical ~ Gyr migration timescale.
Their large orbital separations and expected high planet-to-star flux ratios in
IR make them potentially accessible to high-contrast imaging instruments on 10
m class telescopes. ~10 such planets are expected to exist around FGK dwarfs
within ~50 pc. Long-period radial velocity planets are viable candidates, and
the highly eccentric planet HD 20782b at maximum angular separation ~0.''08 is
a promising candidate. Directly imaging these tidally powered Jupiters would
enable a direct test of high-e migration mechanisms. Once detected, the
luminosity would provide a direct measurement of the migration rate, and
together with mass (and possibly radius) estimate, they would serve as a
laboratory to study planetary spectral formation and tidal physics.

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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: physics
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: supr-con