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Three supernovae classified with the Asiago telescope

ATel #5636; L. Tomasella, L. Tartaglia, P. Ochner, A. Pastorello, S. Benetti, E. Cappellaro, M. Turatto, N. Elias-Rosa (INAF Osservatorio Astronomico di Padova)
on 7 Dec 2013; 00:17 UT
Credential Certification: Lina Tomasella (lina.tomasella@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): The spectrogram of PSN J01463827+0413244 obtained on Dec. 6.84 UT shows that the object is a very young type II supernova. Broad and shallow P-Cyg H-alpha, H-beta and He I 587.6-nm lines are clearly detected. Adopting for the host galaxy PGG 1265294 a redshift z = 0.017742 (Ann at al. 1998, ApJ 496, 39Z, via NED), a good fit is found with the type IIP supernova 1999gi (Leonard et al. 2002, A.J. 124, 2490) a few days after the explosion. The spectrogram of MASTER OT J010223.27+203321.2 obtained on Dec 6.88 UT shows that this is a type II supernova at redshift z=0.024. A good match is found with several normal type II-P supernovae at about one month after the core-collapse. The expansion velocity deduced from the wavelength of the H-alpha absorption, is about 6600 km/s. The spectrogram of PSN J03095731+1912492 obtained on Dec. 06.92 UT shows it to be a type-Ia supernova. Adopting for the host galaxy (IC 1890) a recessional velocity of 10229 km/s (Giovanelli et al. 1993, AJ 105, 1271; via NED), a good match is found with several type-Ia supernovae at a few days before B-band maximum light. An expansion velocity of about 12000 km/s is derived from the minimum of the Si II 635-nm line. The Asiago classification spectra are posted at 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).