Asiago spectroscopic classification of three transients
ATel #12621; P. Ochner, S. Benetti, E. Cappellaro, L. Tomasella, M. Turatto (INAF - Osservatorio Astronomico di Padova)
on 2 Apr 2019; 08:35 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)
Subjects: Optical, Supernovae, Tidal Disruption Event
Referred to by ATel #: 12664
The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic observation of ASASSN-19hp, ZTF19aamkywr and ZTF19aamljom.
The targets were supplied by the All Sky Automated Survey for SuperNovae (ASASSN, Shappee et al. 2014) and ZTF Survey (ATel #11266).
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
ASASSN-19hp | SN2019clp | UGC 07230 | 2019-03-27 | 2019-03-30 22:50:52 | 0.024184 | CC | early | 1
ZTF19aamkywr| AT2019byw |2MASX J17050868+0759262| 2019-03-15 | 2019-03-30 23:49:09 | 0.0307 | TDE? | | 2
ZTF19aamljom| SN2019cbc |2MASS J18060769+6520498| 2019-03-20 | 2019-03-31 00:55:11 | 0.020 | IIn | ~2weeks | 3
(1) The AFOSC noisy spectrum shows a blue (T about 17000 K) almost featureless continuum, typically seen in young core collapse SNe a few days after explosion.
(2) The spectrum of this nuclear transient shows broad hydrogen and HeII lines superimposed to the host galaxy features. Considering both the extinction in the Galaxy (A_V ~ 0.236 mag from Schlafly & Finkbeiner 2011) and in the host galaxy (A_V ~ 2.7 mag estimated from the interstellar NaID absorption) the corrected spectrum exhibits a blue continuum and the absolute magnitude is about ~ -20.6 mag (assuming a distance modulus of 35.64 mag, via NED). All this makes of AT2019byw a possible TDE event.
(3) The Spectrum is consistent with those of SN 1998S, about two/three weeks after explosion.
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.