Classification certificate for object 2020zyy
TNS Classification Report No. 8037 [ 2020TNSCR3514....1B ]

Date Received (UTC): 2020-11-20 00:08:13
Sender: Jamison Burke
Group: Global SN Project

Jamison Burke, Daichi Hiramatsu, D. Andrew Howell, Curtis McCully, Estefania Padilla Gonzalez, Craig Pellegrino report/s a classification of object: SN 2020zyy

Type: SN Ia-91T-like
Redshift: 0.059

Remarks: Using Superfit (Howell et al. 2005, ApJ, 634, 1190) and SNID (Blondin & Tonry 2007, ApJ, 666, 1024), we find best fits to 91T-like SNe Ia a few days to a week before maximum light, including SN 1998es 2 days before peak. The supernova is closest to WISEA J061639.41-212948.9, and we infer a redshift of approximately 0.059 based on the SNID fits. Adopting this redshift we measure a Si II 6355 velocity of approximately 11,000 km/s. Adopting the distance modulus computed from this redshift (37.1), the g-band absolute magnitude of the object roughly coeval with the spectrum is -18.9 (apparent magnitude 18.5 and rising, from ZTF). The absolute magnitude and Si II velocity are consistent with a 91T-like SN Ia before maximum light.

The following Classification spectrum was provided:

Obsdate: 2020-11-19 10:50:13
Instrument: FLOYDS-N
Telescope: Faulkes Telescope North

Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2020zyy