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Spectroscopic classification of 2 PSN

ATel #4386; M. Turatto, M. L. Pumo, S. Vanni, S. Benetti, A. Pastorello, L. Tomasella, P. Ochner, E. Cappellaro, and S. Valenti (Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica)
on 18 Sep 2012; 03:42 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)

Subjects: Optical, Supernovae

We report the spectroscopic confirmation of 2 PSNe with observations obtained with the 1.82-m Copernico Telescope in Asiago (+ AFOSC; range 340-820 nm, resolution 1.4 nm). The spectrogram of PSN J01184597+1459402, obtained on Sept 18.00 UT, shows very strong He lines typical of type-Ib supernovae. Adopting for the host galaxy UGC 838 the redshift z = 0.0229 (SDSS1 via NED), the best fit with the GELATO tool (Harutyuyan et al. 2008, A.Ap. 488, 383) on a vast library of supernovae spectra is with SN 1999dn (Benetti et al. 2011, MNRAS 411, 2726) one day before maximum. The spectrogram of PSN J02245064+1610543, obtained on Sept 18.05 UT, shows the typical features of a normal type-Ia supernova. Adopting for the host galaxy PGC 9159 the redshift z = 0.0272 (LEDA), the best fit with the GELATO tool (Harutyuyan et al. 2008, A.Ap. 488, 383) on a library of supernovae spectra is with SN 2002dj (Pignata et al. 2008, MNRAS 388, 971) three days before maximum. The expansion velocity derived from the position of the SiII doublet is 14350 km s-1.