Classification of PSN J12015272-1852183 as a young type Ic SN

ATel #5165; A. Harutyunyan (Telescopio Nazionale Galileo, TNG), S. Benetti, A. Pastorello, E. Cappellaro, L. Tomasella, P. Ochner, M. Turatto, (Osservatorio Astronomico di Padova, INAF)
on 26 Jun 2013; 07:22 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)

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We report the spectroscopic classification (range 335-785 nm; resolution 1.5 nm) of PSN J12015272-1852183 discovered by the CHASE project on June 22.12 UT. The spectrogram obtained on June 23.88 UT with the TNG Telescope (+Dolores), shows that this is a type-Ic supernova. A good match is found with the type-Ic supernova 1994I (Millard et al 1999, ApJ 527, 746) at about six days before maximum light. The spectrum is dominated by prominent lines of CaII H&K, FeII in the blue part, while in the redder wavelengths weaker lines are detected at about 566, 601.7 and 631 nm. If we identify them with He-I 587.6nm (possibly blended with Na-ID 589.2 nm), Si-II 635.5 nm and C-II 658 nm, respectively, expansion velocities of about 13000 km/s, 18000 km/s and 14000 km/s are deduced, assuming a redshift of 0.005477 for the parent galaxy (Lauberts & Valentijn, 1989, The Surface Photometry Catalogue of the ESO-Uppsala Galaxies, European Southern Observatory, via NED). The Asiago-TNG classification spectra are posted at URL http://sngroup.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).