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Spectroscopic classification of 2 supernovae

ATel #4326; M. Turatto, S. Benetti, A. Pastorello, L. Tomasella, M. Fiaschi, P. Ochner, E. Cappellaro, and S. Valenti (Osservatorio Astronomico di Padova - INAF, Italia)
on 22 Aug 2012; 02:10 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)

Subjects: Optical, Supernovae

We report the spectroscopic confirmations of 2 PSNe with observations obtained with the 1.82-m Copernico Telescope in Asiago (+ AFOSC; range 340-820 nm, resolution 1.4 nm). A spectrogram of PSN J18402884+3607174, obtained on Aug 21.79 UT suggests that this is a type Ib supernova. Adopting for the host galaxy PGC 62237 the redshift z = 0.028563 (Freudling et al. 1995, A&AS 112, 429 via NED) the comparison with a library of supernovae spectra via GELATO (Harutyuyan et al. 2008, A&A 488, 383) shows close similarities to several type Ib one week after maximum. A spectrogram of PSN J17315266+7150120, obtained on Aug 21.86 UT shows the typical features of a normal type Ia supernova. Adopting the redshift z = 0.039694 (Falco et al. 1999, PASP 111, 438 via NED) for the host galaxy PGC 60437, the GELATO (Harutyuyan et al. 2008, A&A 488, 383) best fit with the spectra of our library of supernovae spectra is obtained with that of SN 1989B obtained 6 days after B maximum. The photospheric velocity derived from the SiII doublet is 11000 km/s.