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Spectroscopic classification of two supernovae at Asiago

ATel #4312; L. Tomasella, A. Pastorello, S. Benetti, M. Fiaschi, P. Ochner, E. Cappellaro, M. Turatto, S. Valenti (Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica)
on 18 Aug 2012; 01:54 UT
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)

Subjects: Optical, Supernovae, Transient

We report the spectroscopic confirmations of two transients on observations taken with the 1.82-m Copernico Telescope (+ AFOSC; range 340-820 nm, resolution 2.1 nm). A spectrogram of CSS120813:153936-024101 obtained on Aug 17.81 UT suggests that this is a type II supernova. Together with prominent Balmer lines with P-Cygni profiles, Fe II features are clearly detected. Measuring the redshift z = 0.015 from the peak of the broad H-alpha emission (FWHM about 8300 km/s), the comparison with a library of supernova spectra via GELATO (Harutyuyan et al. 2008, A&A 488, 383) shows that it is a type II event similar to SN 2009bw (Inserra et al. 2012, MNRAS 422, 1122) about 50 days after the explosion. A spectrogram of PSN J20451528-0537221 (SNhunt145) obtained on Aug 17.96 UT indicates that this is a type Ia supernova. Adopting a redshift z=0.027 (Huchra et al. 2003, AJ, 105, 1637), the comparison with a library of supernova spectra via GELATO (Harutyuyan et al. 2008, A&A 488, 383) shows it to be similar to SN 2003du (Stanishev et al. 2007, A&A, 469, 645) around maximum light.