Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Carnegie Supernova Project II. The shock wave revealed through the
  fog: The strongly interacting Type IIn SN 2013L   We present ultra-violet to mid-infrared observations of the long-lasting Type
IIn supernova (SN) 2013L obtained by the Carnegie Supernova Project II
(CSP-II). The spectra of SN 2013L are dominated by H emission features
characterized by three components attributed to different regions. A unique
feature of this Type IIn SN is that the blue shifted line profile is dominated
by the macroscopic velocity of the expanding shock wave of the SN. We are
therefore able to trace the evolution of the shock velocity in the dense and
partially opaque circumstellar medium (CSM), from $\sim 4800~km~s^{-1}$ at +48
d, decreasing as $t^{-0.23}$ to $\sim 2700~km~s^{-1}$ after a year. We perform
spectral modeling of both the broad- and intermediate-velocity components of
the H$\alpha$ line profile. The high-velocity component is consistent with
emission from a radially thin, spherical shell located behind the expanding
shock with emission wings broadened by electron scattering. We propose that the
intermediate component originates from pre-ionized gas from the unshocked dense
CSM with the same velocity as the narrow component, $\sim 100~km~s^{-1}$, but
also broadened by electron scattering. The spectral energy distributions (SEDs)
of SN 2013L after +132 d are well reproduced by a two-component black-body (BB)
model. The circumstellar-interaction model of the bolometric light curve
reveals a mass-loss rate history with large values ($1.7\times 10^{-2} -
0.15~M_\odot~yr^{-1}$) over the $\sim $25 - 40 years before explosion. The drop
in the light curve at $\sim 350$ days and presence of electron scattering wings
at late epochs indicate an anisotropic CSM. The mass-loss rate values and the
unshocked CSM velocity are consistent with the characteristics of a massive
star, such as a luminous blue variable (LBV) undergoing strong eruptions,
similar to $\eta$ Carina.

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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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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: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th