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Asiago spectroscopic classification of two SNe

ATel #9476; S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, A. Pastorello, G. Terreran (INAF OAPd, QUB), L. Tomasella, M. Turatto (INAF OAPd
on 9 Sep 2016; 08:29 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Enrico Cappellaro (enrico.cappellaro@oapd.inaf.it)

Subjects: Optical, Supernovae

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of two transients. The targets are supplied by the All Sky Automated Survey for SuperNOvae (ASAS-SN) and the TNS (https://wis-tns.weizmann.ac.il).

The observations were performed with the Asiago 1.82 m Copernico Telescope equipped with AFOSC (range 340-820 nm; resolution 1.4 nm).

 
Survey Name |  IAU Name  |  Host galaxy |  Redshift | Discovery (UT) | Discovery mag |  Type    |  Phase | Notes  
            | SN 2016gcm | PGC166705    | 0.0224227 |   2016-09-08   |      18.4     |   Ic ?   |  early | (1) 
ASASSN-16ke | SN 2016gcl | AGC 331536   | 0.027999  |   2016-09-08   |      17.0     |Ia-91Tlike|  -10d  | (2) 

(1) The modest S/N spectrum gives an uncertain classification, which is broadly consistent with that of a Type Ic supernova around the maximum light. The redshift derived from matching the SN spectral features, z=0.035, is somewhat higher than that of PGC166705 reported by NED (from Nakanishi et al. 1997, ApJS 112, 245). (2) The spectrum is consistent with that of a SN 1991T-like Type Ia event about 10 days before the B-band maximum light. The expansion velocity deduced from the shallow SiII 635.5nm absorption is about 11000 km/s.

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