Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbital Decay of Short-Period Exoplanets via Tidal Resonance Locking   A large fraction of known exoplanets have short orbital periods where tidal
excitation of gravity waves within the host star causes the planets' orbits to
decay. We study the effects of tidal resonance locking, in which the planet
locks into resonance with a tidally excited stellar gravity mode. Because a
star's gravity mode frequencies typically increase as the star evolves, the
planet's orbital frequency increases in lockstep, potentially causing much
faster orbital decay than predicted by other tidal theories. Due to nonlinear
mode damping, resonance locking in Sun-like stars likely only operates for
low-mass planets ($M \lesssim 0.1 \, M_{\rm Jup}$), but in stars with
convective cores it can likely operate for all planetary masses. The orbital
decay timescale with resonance locking is typically comparable to the star's
main-sequence lifetime, corresponding to a wide range in effective stellar
quality factor ($10^3 \lesssim Q' \lesssim 10^9$), depending on the planet's
mass and orbital period. We make predictions for several individual systems and
examine the orbital evolution resulting from both resonance locking and
nonlinear wave dissipation. Our models demonstrate how short-period massive
planets can be quickly destroyed by nonlinear mode damping, while short-period
low-mass planets can survive, even though they undergo substantial inward tidal
migration via resonance locking.

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The categories of this paper are: physics
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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci