Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bright "merger-nova" from the remnant of a neutron star binary merger: A
  signature of a newly born, massive, millisecond magnetar   A massive millisecond magnetar may survive a merger of a neutron star (NS)
binary, which would continuously power the merger ejecta. We develop a generic
dynamic model for the merger ejecta with energy injection from the central
magnetar. The ejecta emission (the "merger-nova") powered by the magnetar peaks
in the UV band and the peak of lightcurve progressively shifts to an earlier
epoch with increasing frequency. A magnetar-powered mergernova could have an
optical peak brightness comparable to a supernova, which is a few tens or
hundreds times brighter than the radioactive-powered merger-novae (the
so-called macro-nova or kilo-nova). On the other hand, such a merger-nova would
peak earlier and have a significantly shorter duration than that of a
supernova. An early collapse of the magnetar could suppress the brightness of
the optical emission and shorten its duration. Such
millisecond-magnetar-powered merger-novae may be detected from NS-NS merger
events without an observed short gamma-ray burst, and could be a bright
electromagnetic counterpart for gravitational wave bursts due to NS-NS mergers.
If detected, it suggests that the merger leaves behind a massive NS, which has
important implications for the equation-of-state of nuclear matter.

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The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
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The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom