Classification certificate for object 2019byw
TNS Classification Report No. 3758 [ 2019TNSCR.487....1O ]

Date Received (UTC): 2019-04-02 10:00:30
Sender: Dr. Lina Tomasella
Group: Padova-Asiago

Ochner, Benetti, Cappellaro, Tomasella, Turatto (INAF OAPd) report/s a classification of object: SN 2019byw

Type: TDE
Redshift: 0.0307

Remarks: 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.

The following Classification spectrum was provided:

Obsdate: 2019-03-30 23:49:09
Instrument: AFOSC
Telescope: Asiago Ekar Telescope

Remarks: 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.

Details of the object and its spectra can be viewed here: https://wis-tns.weizmann.ac.il/object/2019byw