Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A possible tidal disruption event candidate in the black hole binary
  system of OJ 287   The BL Lacertae OJ 287 is a supermassive black holes binary (SMBHB) system
with complex physics of its irregular flares. During 2016 October -- 2017 April
period, a surprising outburst in the X-ray, UV and optical bands was detected,
while no variability was seen in the $\gamma$-ray light curve. During the
outburst, the X-ray light curves were dominated by the soft X-rays, whose peak
in the luminosity was $\sim$ $10^{46}\text{erg}~\text{s}^{-1}$ -- more than 10
times higher than the mean level before the outburst -- and a
"softer-when-brighter" phenomenon was exhibited. These above phenomena have
been reported by some previous works. The hardness ratio showed negligible
evolution with flare time and soft X-ray luminosity. Critically, the luminosity
of the soft X-rays decayed following a power law of $t^{-5/3}$ which occurs in
most tidal disruption events (TDEs), and similar trend can be seen in UV and
optical bands during the soft X-ray declining period. Helium and oxygen narrow
emission lines are strengthened prominently in the optical spectra of
postoutburst epochs, that could be attributed to the surrounding gas appeared
due to TDE. We discuss three possible origins of the event, including the jet's
precession, the aftereffect of the black hole-disk impaction and the TDE. Our
results show that the TDE is the more likely scenario to explain the outburst.

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The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
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The categories of this paper are: nlin
23
The categories of this paper are: solv-int