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Spectroscopic classification of four supernovae at Asiago

ATel #4655; M. Turatto, S. Benetti, L. Tomasella, A. Pastorello, E. Cappellaro, P. Ochner, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica
on 19 Dec 2012; 12:22 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Lina Tomasella (lina.tomasella@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 PSN J23012936+0653381 obtained on Dec. 17.72 UT suggests that this is a type-Ia at redshift z~0.039. The best match was found with several type-Ia supernovae about 1 week after maximum light. The expansion velocity as deduced from the position of the Si-II 635.5nm absorption is about 10800 km/s. A spectrogram of PSN J06434189+5212337 obtained on Dec. 19.01 UT shows that this is a type-Ia at redshift z~0.043. The best match was found with type-Ia supernova 1994D (Patat et al. 1996, MNRAS 278, 111) about two weeks after maximum light. The expansion velocity as deduced from the position of the Si-II 635.5nm absorption is about 8600 km/s. A spectrogram of PSN J09413802+4840255 (= SNhunt162) obtained on Dec. 19.12 UT shows that this is a type II supernova. Together with Balmer lines showing P-Cygni profiles, Fe II lines and the Na I doublet feature are detected. Adopting for the host galaxy MCG+8-18-23 the redshift z = 0.038054 (SDSS 2004 Data Release 3, via NED), the best fit is obtained with type IIP SN 1999gi (Leonard et al. 2002, AJ 124, 2490; Smartt et al. 2001, ApJ 556L, 29) at maximum light. A spectrogram of PSN J10354824+3900279 obtained on Dec. 19.33 UT suggests that this is a type-Ia at redshift z~0.044. The best match was found with several type-Ia supernovae around maximum light. The expansion velocity as deduced from the position of the Si-II 635.5nm absorption is about 11200 km/s. 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).