Issue |
A&A
Volume 545, September 2012
|
|
---|---|---|
Article Number | L7 | |
Number of page(s) | 8 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361/201220105 | |
Published online | 13 September 2012 |
Supernova 2008J: early time observations of a heavily reddened SN 2002ic-like transient⋆,⋆⋆
1
The Oskar Klein Centre, Department of AstronomyStockholm
University,
AlbaNova,
10691
Stockholm,
Sweden
e-mail: ftadd@astro.su.se
2
Department of Physics and Astronomy, Aarhus
University, Ny Munkegade
120, 8000
Aarhus C,
Denmark
3
Carnegie Observatories, Las Campanas Observatory,
Casilla 601, La Serena, Chile
4
Observatories of the Carnegie Institution for
Science, 813 Santa Barbara
Street, Pasadena,
CA,
USA
5
INAF – Osservatorio Astronomico di Padova, vicolo
dell’Osservatorio 5, 35122
Padova,
Italy
6
Departamento de Astronomia, Universidad de Chile,
Casilla 36D, Santiago, Chile
7
Argelander Institut für Astronomie, Universität
Bonn, Auf dem Hügel
71, 53111
Bonn,
Germany
8
Kavli Institute for the Physics and Mathematics of the Universe
(IPMU), University of Tokyo, 5-1-5
Kashiwanoha, Kashiwa, Chiba
277-8583,
Japan
9
N. Copernicus Astronomical Center, ul. Bartycka 18,
00-716
Warszawa,
Poland
10
The Oskar Klein Centre, Department of Physics, Stockholm
University, AlbaNova, 10691
Stockholm,
Sweden
11
Dark Cosmology Centre, Niels Bohr Institute, University of
Copenhagen, 2100
Copenhagen,
Denmark
12
Department of Physics and Astronomy, Texas A&M
University, College
Station, TX
77845,
USA
13
The Mitchell Institute for Fundamental Physics and Astronomy,
Texas A&M University, College
Station, TX
77845,
USA
Received: 25 July 2012
Accepted: 21 August 2012
Aims. We provide additional observational evidence that some Type Ia supernovae (SNe Ia) show signatures of circumstellar interaction (CSI) with hydrogen-rich material.
Methods. 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 μm. A published high-resolution spectrum is used to provide insight on the circumstellar material (CSM).
Results. SN 2008J is found to be affected by AV ~ 1.9 mag of extinction and to closely resemble SN 2002ic. Spectral and color comparison to SNe 2002ic and 2005gj suggests RV < 3.1. Spectral decomposition reveals the underlying SN emission matches a 1991T-like event and, since SN 2008J is as luminous as SN 2005gj (Vmax = −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 ~50 km s-1. We conclude that SN 2008J best matches an explosion of a SN Ia that interacts with its CSM.
Key words: supernovae: general / supernovae: individual: SN 2008J
Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile (ESO Programme 080.A–0516).
Figure 4 and Tables 1–6 are available in electronic form at http://www.aanda.org
© ESO, 2012
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