OHP classification of Atlas21aao (=AT2021fv) as a Ia SN a few days before maximum
ATel #14304; M. Dennefeld (IAP-Paris and Sorbonne University), C. Adami (LAM-Marseille), J. Schmitt and J. P. Troncin (OHP and OSU Pytheas)
on 6 Jan 2021; 21:08 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Michel Dennefeld (dennefel@iap.fr)
Subjects: Optical, Supernovae
During a further test run of the new spectro-imager Mistral attached to the 1.93m telescope at Haute-Provence Observatory (OHP-CNRS), we observed the transient ATLAS21aao (=AT2021fv) on Jan. 06.021 UT. The useful range was 408-812 nm and the slit was opened at 2" (4 pixels of 0.20 nm each). From GELATO (Harutyunyan et al. 2008, A&A, 488, 383), the best match is obtained with the Ia SN 1992A 4-5 days before the B maximum. Using the redshift of the host galaxy CGCG 033-001 of 0.0260 (from NED-IPAC), we derive an expansion velocity of 13070 km/s from the SiII 635.5 nm line, consistent with the classification.
