Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Supernova 2008J: early time observations of a heavily reddened SN
  2002ic-like transient   We provide additional observational evidence that some Type Ia supernovae
(SNe Ia) show signatures of circumstellar interaction (CSI) with hydrogen-rich
material. Early phase optical and near-infrared (NIR) light curves and
spectroscopy of SN 2008J obtained by the Carnegie Supernova Project are studied
and compared to those of SNe 2002ic and 2005gj. Our NIR spectrum is the first
obtained for a 2002ic-like object extending up to 2.2 $\mu$m. A published
high-resolution spectrum is used to provide insight on the circumstellar
material (CSM). SN 2008J is found to be affected by $A_V\sim$ 1.9 mag of
extinction and to closely resemble SN 2002ic. Spectral and color comparison to
SNe 2002ic and 2005gj suggests $R_V$ $<$ 3.1. Spectral decomposition reveals
the underlying SN emission matches a 1991T-like event and, since SN 2008J is as
luminous as SN 2005gj ($V_{\rm max}$ $=$ $-$20.3 mag), we conclude that their
CSI emissions are similarly robust. The high-resolution spectrum reveals narrow
emission lines produced from un-shocked gas characterized by a wind velocity of
$\sim$ 50 km s$^{-1}$. We conclude that SN 2008J best matches an explosion of a
SN Ia that interacts with its CSM.

21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph