Spectroscopic classification of two supernovae at Asiago
ATel #4263; L. Tomasella, S. Benetti, E. Cappellaro, P. Ochner, A. Pastorello, M. Turatto, and S. Valenti (Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica)
on 18 Jul 2012; 07:03 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 confirmations of two transients on observations taken with the 1.82-m Copernico Telescope (+ AFOSC; range 340-820 nm, resolution 2.4 nm).
A spectrogram of CSS120618:133350+260807 obtained on Jul. 17.87 UT suggests that this is a normal type-Ia supernova.
Cross-correlation with a library of supernova spectra via the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that the transient has a redshift of about 0.071 and is similar to several normal SNe Ia at about one month after the light curve maximum.
A spectrogram of PSN J16234592+0947123 obtained on Jul. 17.92 UT suggests that this is a normal type-Ia supernova.
Adopting for the host galaxy CGCG 080-021 a redshift z = 0.03403 (Emilio E. et al 1999, PASP 111, via NED) the comparison with a library of supernovae spectra via GELATO (Harutyuyan et al. 2008, A.Ap. 488, 383) shows that it is a type Ia event soon after maximum.
Corrigendum: The dates reported in Atel #4260 are July and not June.
