Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The WISE Detection of an Infrared Echo in Tidal Disruption Event
  ASASSN-14li   We report the detection of a significant infrared variability of the nearest
tidal disruption event (TDE) ASASSN-14li using Wide-field Infrared Survey
Explorer} and newly released Near-Earth Object WISE Reactivation} data. In
comparison with the quiescent state, the infrared flux is brightened by 0.12
and 0.16 magnitude in the W1 ($3.4\mu$m) and W2 ($4.6\mu$m) bands at 36 days
after the optical discovery (or $\sim110$ days after the peak disruption date).
The flux excess is still detectable $\sim170$ more days later. Assuming that
the flare-like infrared emission is from the dust around the black hole, its
blackbody temperature is estimated to be $\sim2.1\times10^3$~K, slightly higher
than the dust sublimation temperature, indicating that the dust is likely
located close to the dust sublimation radius. The equilibrium between the
heating and radiation of the dust claims a bolometric luminosity of
$\sim10^{43}-10^{45}$~\lum, comparable with the observed peak luminosity. This
result has for the first time confirmed the detection of infrared emission from
the dust echoes of TDEs.

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The categories of this paper are: dg-ga
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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: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: cs