Asiago spectroscopic classification of two transients
ATel #14160; L. Tomasella, S. Benetti, E. Cappellaro, N. Elias-Rosa, A. Pastorello (INAF Padova)
on 9 Nov 2020; 10:49 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 ZTF20acowddo (SN2020yyg) and ATLAS20bevx (SN 2020yvv).
The targets were supplied by the Zwicky Transient Facility (https://www.ztf.caltech.edu/; Kulkarni et al. 2018, ATel #11266, via ALeRCE broker) and by the ATLAS survey (Tonry et al. (2011, PASP, 123, 58). and reported in the Transient Name Server (TNS).
The observations were obtained 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
ZTF20acowddo | SN 2020yyg | SDSS J015405.95+070859.8 | 2020-11-05 21:32:37 | 2020-11-08 19:24 | 0.067 | Iax | few days before max | 1
ATLAS20bevx | SN 2020yvv | WISEA J235913.43+383746.6 | 2020-11-03 09:17:17 | 2020-11-08 21:26 | 0.032 | Ib | few days before max | 2
(1) The spectrum is consistent with those of SNe Ia-91T-like few days before maximum. The expansion velocity deduced from the Si II 635.5 nm absorption is about 10000 km/s. The redshift is from narrow lines of the host galaxy, which is different from the photometric redshift (0.051) reported by SDSS.
(2) The spectrum resembles those of type Ib SNe few days before maximum. The redshift has been deduced from the SN spectral fitting.
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
