Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Supernova 2017eaw: molecule and dust formation from infrared
  observations   We present infrared (IR) photometry and spectroscopy of the Type II-P SN
2017eaw and its progenitor in the nearby galaxy NGC 6946. Progenitor
observations in the Ks band in 4 epochs from 1 year to 1 day before the
explosion reveal no significant variability in the progenitor star greater than
6% that last longer than 200 days. SN 2017eaw is a typical SN II-P with near-IR
and mid-IR photometric evolution similar to those of SNe 2002hh and 2004et,
other normal SNe II-P in the same galaxy. Spectroscopic monitoring between 389
and 480 days post explosion reveals strong CO first overtone emission at 389 d,
with a line profile matching that of SN 1987A from the same epoch, indicating
$\sim 10^{-3} \, M_{\odot}$ of CO at 1,800 K. From the 389 d epoch until the
most recent observation at 566 d, the first overtone feature fades while the
4.5 $\mu$m excess, likely from the CO fundamental band, remains. This behavior
indicates that the CO has not been destroyed, but that the gas has cooled
enough that the levels responsible for first overtone emissions are no longer
populated. Finally, the evolution of Spitzer 3.6 $\mu$m photometry shows
evidence for dust formation in SN 2017eaw, with a dust mass of $10^{-6}$ or
$10^{-4}\,M_{\odot}$ assuming carbonaceous or silicate grains respectively.

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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: plasm-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio