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Spectroscopic classification of four supernovae at Asiago

ATel #4548; L. Tomasella, S. Benetti, E. Cappellaro, A. Pastorello, M. Turatto, M. Fiaschi (Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica)
on 6 Nov 2012; 11:14 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 four 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 CSS121026:164652+565105 obtained on Nov. 05.78 UT suggests that this is a type-Ic at redshift z~0.07. The best match was found with type-Ic SN 2007gr (Tanaka et al. 2008, ApJ 689, 1191; Valenti et al. 2008, ApJ 673, L155) some days after maximum. A spectrogram of PSN J22305042-1411163 obtained on Nov. 05.84 UT suggests that this is a reddened type II supernova few days after explosion at redshift z = 0.01679 (de Vaucouleurs et al. 1991, RC3; via NED database). Broad Balmer lines of hydrogen are clearly detected (H-alpha has a FWHM of about 11000 km/s). A spectrogram of PSN J01514770+2116206 obtained on Nov. 06.02 UT suggests that this is a type Ia supernova about ten days after maximum light at redshift z~0.055. The expansion velocity as deduced from the position of the Si-II 635.5nm absorption is about 10000 km/s. A spectrogram of CSS121027:043611-050453 obtained on NOV. 06.07 UT suggests that this is a type II supernova about one month after explosion at redshift z~0.03. For the estimated epoch, a high ejecta expansion velocity of about 9500 km/s is derived from the minimum of the broad, P-Cyg profile, H-alpha line. 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).