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Spectroscopic classification of CSS150213:100134+453359 in SDSS J100134.51+453339.9

ATel #7120; Nancy Elias-Rosa, Stefano Benetti (INAF-OAPd; Italy), Michel Dennefeld (IAP; Paris), and the NEON school students: Demetra De Cicco (Naples; Italy), Paulina Sowicka (Warsaw; Poland), Ignacio Ordovas-Pascual (Santander; Spain) and Marco Cheuk-Yin Lam (Edinburgh; UK)
on 21 Feb 2015; 15:25 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: N. Elias-Rosa (nancy.elias@oapd.inaf.it)

Subjects: Optical, Supernovae

Referred to by ATel #: 7156

We report the spectroscopic observation of CSS150213:100134+453359 in SDSS J100134.51+453339.9. The observation was performed with the Asiago 1.82m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.4 nm), equipped with the CCD Andor IKON L936.

Name                     | Date (UT)    |  z       |  Type  | Phase               | 
CSS150213:100134+453359  | 20150220.05  |  0.076   |  SN Ia | few days after max  | 

The spectrum is consistent with a type Ia supernova at a few days before the maximum light. Cross-correlation with a library of supernova spectra using the comparison tool GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024), show that it matches with SN 2006gz (Hicken et al. 2007, ApJ, 669, 17) at t = 6 days after B maximum. From the position of the minimum of the Si II 635.5 nm feature, we infer a velocity of about 11000 km/s for the ejected material (we have used z=0.076 for the host galaxy, via NED).