Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Analytical Density Profile of Dense Circumstellar Medium in Type II
  Supernovae   Observations of Type II supernovae imply that a large fraction of its
progenitors experience enhanced mass loss years to decades before core
collapse, creating a dense circumstellar medium (CSM). Assuming that the CSM is
produced by a single mass eruption event, we analytically model the density
profile of the resulting CSM. We find that a double power-law profile, where
the inner (outer) power-law index has a characteristic value of -1.5 (-10 to
-12), gives a good fit to the CSM profile obtained using radiation
hydrodynamical simulations. With our profile the CSM is well described by just
two parameters, the transition radius $r_*$ and density at $r=r_*$
(alternatively $r_*$ and the total CSM mass). We encourage future studies to
include this profile, if possible, when modelling emission from
interaction-powered transients.

33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci