Asiago spectroscopic classification of supernovae CSS140603:160725+364736, CSS140605:153631+465414 and PSN J21151330+0211224

ATel #6214; L. Tomasella, S. Benetti, A. Pastorello, E. Cappellaro, N. Elias-Rosa, P. Ochner and M. Turatto (INAF, Osservatorio Astronomico di Padova)
on 9 Jun 2014; 08:21 UT
Credential Certification: Enrico Cappellaro (enrico.cappellaro@oapd.inaf.it)

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We report the spectroscopic confirmation of three supernovae obtained with the 1.82-m Copernico Telescope in Asiago (+ AFOSC; range 340-820 nm; resolution 1.3 nm) under the Asiago Transient Classification Program (Tomasella et al. 2014, posted at http://arxiv.org/abs/1403.7233 )

A spectrogram of CSS140603:160725+364736 obtained on June 08.90 UT shows that this is a type Ia supernova. A good match is found with several type Ia SNe at redshift about 0.07 and near maximum light. An expansion velocity of 9800 km/s is derived from the minimum of the Si II 635-nm line

A spectrogram of CSS140605:153631+465414 obtained on June 08.95 UT shows that this is a normal type Ia supernova. A good match is found with several SNe Ia about 1 week after B-band maximum light. An expansion velocity of 9600 km/s is derived from the minimum of the Si II 635-nm line.

A spectrogram of PSN J21151330+0211224 obtained on June 09.01 UT shows that this is a type-Ia SN. Adopting for the host galaxy (IC 1370) a redshift z = 0.050 (Huchra et al. 1999, ApJS 121, 28, via NED), a good match is found with several normal type-Ia SNe few days before B-band maximum light. An expansion velocity of about 11900 km/s is derived from the minimum of the Si II 635-nm line.

The Asiago classification spectra are posted at the URL http://sngroup.oapd.inaf.it. Classification were made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).