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Asiago spectroscopic classification of two transients

ATel #9833; M. Turatto, S. Benetti, L. Tomasella, E. Cappellaro, N. Elias-Rosa, P. Ochner, A. Pastorello (INAF Osservatorio Astronomico di Padova), G. Terreran (INAF-OAPd, QUB)
on 7 Dec 2016; 10:53 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

Subjects: Optical, Supernovae

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic observation of Gaia16bzi, AT2016isl. The targets were supplied by the ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts), the Tsinghua-NAOC Transient Survey (TNTS) and by Kunihiro Shima..

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

Survey name | IAU name  |       Host galaxy       | Disc. Date (UT) | Obs. Date (UT)   | redshift |    type     |   phase    | notes  
 Gaia16bzi  | SN2016ise | 2MASX J01235332+1139499 |   2016-11-30    |  2016-12-06.74   |  0.056   |      ?      |     --     |   1    
 AT2016isl  | SN2016isl |         NGC1488         |   2016-12-06    |  2016-12-07.06   |  0.023   | Ia-91T like | before max |   2    

(1) The AFOSC low S/N spectrum shows a blue (T~9300K) featureless continuum, compatible with that of a Core Collapse SN soon after explosion. The redshift z=0.0560 is derived from the position of the host galaxy narrow Halpha emission line.

(2) The AFOSC spectrum is similar to those of several SN1991T-like supernovae about a week before maximum. The expansion velocity deduced from the Si-II 635.5nm absorption is about 10600 km/s assuming a redshift z=0.023359 as reported by Giovanelli and Haynes, 1993 (AJ 105, 1271).

The classification was 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.

Padova-Asiago SN Group