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Asiago spectroscopic classification of ASASSN-17ff

ATel #10304; L. Tomasella, S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, A. Pastorello, G. Terreran, M. Turatto (INAF OAPd)
on 21 Apr 2017; 20:57 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 classification of ASASSN-17ff in NGC 3506(AT 2017dfq), discovered during the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN), cf. Atel#10301.

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

Survey Name   | IAI Name      | Discovery date (UT) | Discovery mag | Observation (UT)    |  Type  | z        | Notes| 
ASASSN-17ff   | SN 2017dfq    |2017-04-20.25        |      16. 4    |2017-04-21.81        |  SN Ia | 0.021358 | (1)  | 

(1) A good match is obtained with several Type Ia SNe around B-band maximum light. From the position of the minimum of the Si II 635nm feature, we infer an expansion velocity of 11300 km/s for the ejected material, using the redshift z=0.021358 of the host galaxy NGC 3506 (De Vaucouleurs et al., 1991 RC3.9, via NED).

Classification was 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.

Padova-Asiago SN group