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Spectroscopic classification of three supernovae at Asiago

ATel #4897; L. Tomasella, A. Pastorello, S. Benetti, E. Cappellaro, P. Ochner, M. Turatto (Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica)
on 19 Mar 2013; 07:39 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)

Subjects: Optical, Supernovae

We report the spectroscopic classification of three supernovae obtained with the Asiago 1.82-m Copernico Telescope (+ AFOSC, range 340-820 nm; resolution 1.3 nm) A spectrogram taken on Mar. 15.88 UT shows that PSN J10305847+2004529 (= SNhunt171) in PGC 91020 is a type-II. The low S/N spectrum shows a narrow Halpha, at z=0.026 as given for the host galaxy (SDSS Data Release 6, 2007, via NED) overposed on a broader component, suggesting that it is a type II SN few days after explosion. The poor spectral resolution does not allow us to determine if the narrow Halpha is from the CSM or from an underlying H II region. A spectrogram obtained on Mar. 15.93 UT shows that PSN J08374502+4928322 is a type-Ia at z ~ 0.06. The best match was found with various type-Ia supernovae and in particular with supernova 1992A (Kirshner R.P. et al. 1993, ApJ 415, 589) about one week before the maximum light. The expansion velocity of the SN ejecta, as measured from the position of the minimum of the Si II 635.5 nm line, is about 13600 km/s. A spectrogram taken on Mar. 16.16 UT shows that CSS130301:121933+380226SN is a type-Ia at z ~ 0.05. The best match was found with various type-Ia supernovae and in particular with supernova 1994D (Patat et al. 1996, MNRAS 278, 111) about fifty days after maximum light. The Asiago classification spectra are posted at this website: URL http://graspa.oapd.inaf.it ; classification was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).