Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photometric and spectroscopic evolution of the type IIP supernova SN
  2004et   We present optical photometry and spectroscopy of the type IIP supernova SN
2004et that occurred in the nearby galaxy NGC 6946. The observations span a
time range of 8 days to 541 days after explosion. The late time bolometric
luminosity and the H$\alpha$ luminosity in the nebular phase indicate that
$0.06\pm0.02{M_\odot}$ of $^{56}$Ni was synthesised during the explosion. The
plateau luminosity, its duration and the expansion velocity of the supernova at
the middle of the plateau indicate an explosion energy of $E_{\rm{exp}}=
1.20^{+0.38}_{-0.30} \times 10^{51}$ ergs. The late time light curve and the
evolution of the [OI] and H$\alpha$ emission line profiles indicate the
possibility of an early dust formation in the supernova ejecta.
  The luminosity of [OI] 6300, 6364 \AA doublet, before the dust formation
phase, is found to be comparable to that of SN 1987A at similar epochs, impling
an oxygen mass in the range $1.5 - 2{M_\odot}$, and a main sequence mass of
$20{M_\odot}$ for the progenitor.

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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: eess