[ Previous | Next | ADS ]

PSN J06213846-5942506 is a young type-Ia supernova

ATel #4663; N. Morrell, M. M. Phillips, C. Contreras, M. Roth, and E. Y. Hsiao (Las Campanas Observatory); G. H. Marion (Harvard-Smithsonian Center for Astrophysics); and M. Stritzinger (Aarhus University), on behalf of the Carnegie Supernova Project
on 20 Dec 2012; 17:17 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Eric Hsiao (hsiao@lco.cl)

Subjects: Infra-Red, Optical, Supernovae

We report that a near-infrared spectrum (range 800-2400 nm) of PSN J06213846-5942506 was obtained on Dec. 20.20 UT with the Folded-port Infrared Echellette (FIRE) spectrograph on the 6.5-m Magellan Baade Telescope. The spectrum shows that it is a type-Ia supernova approximately a week before maximum light. The near-infrared spectrum is similar to that of SN 2003W at eight days before maximum (Marion et al. 2009, A.J. 138, 727). Adopting a redshift of z=0.008 for the presumed host galaxy PGC 18880, the velocity of the Mg II 1092.7-nm absorption feature is measured to be approximately 12,200 km/s. The latest optical photometry from the 1-m Swope Telescope is r = 14.3 mag on Dec. 20.29 UT, on the rise from the previous two nights.