LJT spectroscopic classification of AT 2021agnf as a 91bg-like Type Ia supernova
ATel #15140; Qian Zhai, Jujia Zhang (YNAO); Xiaofeng Wang(THU)
on 25 Dec 2021; 02:42 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ju-Jia Zhang (jujia@ynao.ac.cn)
Subjects: Optical, Supernovae
We report an optical spectrum of AT 2021agnf (350-870nm) obtained on 2021 Dec. 24.79 UT with the Lijiang 2.4-m telescope (LJT +YFOSC) at Lijiang observatory of Yunnan Observatories. The spectrum is similar to a 91bg-like type Ia supernovae around the peak. Cross-correlation with the library of supernova spectra using the comparison tool SNID (Blondin and Tonry 2007, ApJ, 666, 1024) shows that it matches SN 1991bg at t = +3 days at the given redshift = 0.023 of the host galaxy CGCG 175-003. The expansion velocity derived from the Si II 6355 is about 9000 km/s.
