Taddia, F.2; Stritzinger, M. D.13; Phillips, M. M.3; Burns, C. R.4; Heinrich-Josties, E.4; Morrell, N.3; Sollerman, Jesper Olof5; Valenti, S.6; Anderson, J. P.7; Boldt, L.8; Campillay, A.3; Castellon, S.3; Contreras, C.3; Folatelli, G.9; Freedman, W. L.4; Hamuy, M.7; Krzeminski, W.10; Leloudas, Georgios11; Maeda, K.9; Persson, S. E.4; Roth, M.3; Suntzeff, N. B.12
1 Department of Physics and Astronomy, Science and Technology, Aarhus University2 The Oskar Klein Centre, Department of AstronomyStockholm University, AlbaNova, 10691, Stockholm, Sweden email@example.com Carnegie Observatories, Las Campanas Observatory, Casilla 601, La Serena, Chile4 Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA, USA5 The Oskar Klein Centre, Department of AstronomyStockholm University6 INAF - Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122, Padova, Italy7 Departamento de Astronomia, Universidad de Chile, Casilla 36D, Santiago, Chile8 Argelander Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53111, Bonn, Germany9 Kavli Institute for the Physics and Mathematics of the Universe (IPMU), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8583, Japan10 N. Copernicus Astronomical Center, ul. Bartycka 18, 00-716, Warszawa, Poland11 Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen12 Department of Physics and Astronomy, Texas A&M University, College Station, TX, 77845, USA13 Department of Physics and Astronomy, Science and Technology, Aarhus University
early time observations of a heavily reddened SN 2002ic-like transient
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.