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Spectroscopic classification of three supernovae at Asiago

ATel #4776; L. Tomasella, S. Benetti, E. Cappellaro, A. Pastorello, M. Turatto, P. Ochner (Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica)
on 1 Feb 2013; 08:01 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)

Subjects: Optical, Supernovae, Transient

We report the spectroscopic confirmation of three supernovae with observations obtained with the 1.82-m Copernico Telescope in Asiago (+ AFOSC; range 340-820 nm, resolution 1.3 nm).

A spectrogram of PSN J23470787+2929115 obtained on Jan. 30.77 UT indicates that it is a type-Ia supernova about ten days before maximum light at redshift z = 0.017239 (Rhee & van Albada 1996, A&A Supple. 115, 407; via NED). The expansion velocity, deduced from the Si II 635.5-nm absorption, is about 14000 km/s.

A spectrogram of MASTER OT J093135.12+352342.4 obtained on Jan. 31.09 UT indicates that it is a type-Ia supernova about twenty days after maximum light at redshift z of about 0.052, as derived from the spectral features. The expansion velocity, deduced from the Si II 635.5-nm absorption, is about 11000 km/s.

A spectrogram of PSNJ13101968+3228257 obtained on Jan. 31.17 shows that it is a type-Ia supernova about forty days after maximum light at redshift z = 0.017646 (Rines et al. 2001, ApJL 561, 41, via NED).

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&A 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).