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Spectroscopic classification of threeI SNe at Asiago

ATel #7787; L. Tomasella, S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, A. Pastorello, L. Tartaglia, G. Terreran, M. Turatto (INAF OAPd)
on 11 Jul 2015; 14:17 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Enrico Cappellaro (enrico.cappellaro@oapd.inaf.it)

Subjects: Optical, Supernovae

Referred to by ATel #: 7821, 7845

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of ASASSN-15mg (ATel #7780) in 2MASX J15322270+4150586, discovered during the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN), PSN J17292918+7542390 in NGC 6412, discovered by Ron Arbour, and PSN J22460504-1059484 in NGC7371, discovered by Koichi Itagaki. Informations on these transients are also available from the "Bright Supernova" website (http://www.rochesterastronomy.org/snimages/) and the CBAT "Transient Objects Confirmation Page" (http://www.cbat.eps.harvard.edu/unconf/tocp.html). The observations were performed with the Asiago 1.82 m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.4 nm).

Name                         | Date (UT)    |     z     |   Type   | Phase   | Notes       
ASASSN-15mg                  | 20150710.88  |    0.0428 |    Ia    |  -7d    | (1) 
PSN J17292918+7542390        | 20150710.97  |    0.0044 |    II    | early   |  
PSN J22460504-1059484        | 20150711.07  |    0.0089 |    IIb?  |  max    | (2) 

(1) The expansion velocity of the ejected material, as inferred from the position of the absorption of the SiII 6355 \AA, is about 15000 km/s.

(2) the red continuum and spectral features are best fitted by the type IIb SN2000H after maximum. However the spectral classification codes find also good matches both with differentl type I SNe before maximum.

Classifications were done with GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024). The Asiago classification spectra are posted at the website http://sngroup.oapd.inaf.it.