Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Outside the Wall: Hydrodynamics of Type I Supernovae Interacting with a
  Partially Swept-Up Circumstellar Medium   Explaining the observed diversity of supernovae (SNe) and the physics of
explosion requires knowledge of their progenitor stars, which can be obtained
by constraining the circumstellar medium (CSM). Models of the SN ejecta
colliding with CSM are necessary to infer the structure of the CSM and tie it
back to a progenitor model. Recent SNe I revealed CSM concentrated at a
distance $r\sim10^16$ cm, for which models of SN interaction are extremely
limited. In this paper, we assume the concentrated region is a "wall"
representing swept-up material, and unswept material lies outside the wall. We
simulate one-dimensional hydrodynamics of SNe Ia & Ib impacting 300 unique CSM
configurations using RT1D, which captures the Rayleigh-Taylor instability. We
find that the density ratio between the wall and ejecta -- denoted $A_0$ or
"wall height" -- is key, and higher walls deviate more from self-similar
evolution. Functional fits accounting for $A_0$ are presented for the forward
shock radius evolution. We show that higher walls have more degeneracy between
CSM properties in the deceleration parameter, slower shocks, deeper-probing
reverse shocks, slower shocked ejecta, less ejecta mass than CSM in the shock,
and more mixing of ejecta into the CSM at early times. We analyze observations
of SN 2014C (Type Ib) and suggest that it had a moderately high wall ($10 < A_0
< 200$) and wind-like outer CSM. We also postulate an alternate interpretation
for the radio data of SN 2014C, that the radio rise occurs in the wind rather
than the wall. Finally, we find that hydrodynamic measurements at very late
times cannot distinguish the presence of a wall, except perhaps as an
anomalously wide shock region.

27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: eess
24
The categories of this paper are: dg-ga