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Spectroscopic classification of PSN J04561965-1548027 as SN 1991bg type Ia supernova

ATel #6717; Shubham Srivastav, D. K. Sahu, G. C. Anupama (Indian Institute of Astrophysics, Bangalore, India)
on 19 Nov 2014; 15:10 UT
Credential Certification: G.C. Anupama (gca@iiap.res.in)

Subjects: Optical, Supernovae

We report the spectroscopic classification of PSN J04561965-1548027 (CBAT TOCP) in IC 2104 as a type Ia supernova. A low resolution spectrum (330-920 nm) obtained on Oct 17.8 UT with the HFOSC instrument on the 2-m Himalayan Chandra Telescope exhibits prominent features due to Si II, O I, Fe II and Ca II, along with a blend of features between 400-450 nm.

The ratio of Si II 5972/6355 is quite high, suggesting that it is a subluminous event. SNID (Blondin and Tonry 2007, ApJ, 666, 1024) finds a best match with SN 1991bg at a few days past maximum. Correcting for the recession velocity of the host galaxy, ~5500 km/sec (Mathewson et al. 1992, ApJS, 81, 413), the Si II 6355 feature shows an expansion velocity of ~10,000 km/sec.