Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extensive Spectroscopy and Photometry of the Type IIP Supernova 2013ej   We present extensive optical ($UBVRI$, $g'r'i'z'$, and open CCD) and
near-infrared ($ZYJH$) photometry for the very nearby Type IIP SN ~2013ej
extending from +1 to +461 days after shock breakout, estimated to be MJD
$56496.9\pm0.3$. Substantial time series ultraviolet and optical spectroscopy
obtained from +8 to +135 days are also presented. Considering well-observed SNe
IIP from the literature, we derive $UBVRIJHK$ bolometric calibrations from
$UBVRI$ and unfiltered measurements that potentially reach 2\% precision with a
$B-V$ color-dependent correction. We observe moderately strong Si II
$\lambda6355$ as early as +8 days. The photospheric velocity ($v_{\rm ph}$) is
determined by modeling the spectra in the vicinity of Fe II $\lambda5169$
whenever observed, and interpolating at photometric epochs based on a
semianalytic method. This gives $v_{\rm ph} = 4500\pm500$ km s$^{-1}$ at +50
days. We also observe spectral homogeneity of ultraviolet spectra at +10--12
days for SNe IIP, while variations are evident a week after explosion. Using
the expanding photosphere method, from combined analysis of SN 2013ej and SN
2002ap, we estimate the distance to the host galaxy to be $9.0_{-0.6}^{+0.4}$
Mpc, consistent with distance estimates from other methods. Photometric and
spectroscopic analysis during the plateau phase, which we estimated to be
$94\pm7$ days long, yields an explosion energy of $0.9\pm0.3\times10^{51}$
ergs, a final pre-explosion progenitor mass of $15.2\pm4.2$~M$_\odot$ and a
radius of $250\pm70$~R$_\odot$. We observe a broken exponential profile beyond
+120 days, with a break point at +$183\pm16$ days. Measurements beyond this
break time yield a $^{56}$Ni mass of $0.013\pm0.001$~M$_\odot$.

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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
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The categories of this paper are: math
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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: adap-org
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The categories of this paper are: physics
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The categories of this paper are: q-fin