LJT Spectroscopic Classification of AT2020enm as a Young 99aa-like Type Ia Supernova
ATel #13566; Jujia Zhang(YNAO) and Xiaofeng Wang(THU)
on 19 Mar 2020; 01:31 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ju-Jia Zhang (jujia@ynao.ac.cn)
Subjects: Optical, Supernovae
We obtained an optical spectrum (range 350-870 nm) of AT 2020enm(=XMPGS1), discovered by XOSS, on UT 2020 Mar. 18.8 with the Li-Jiang 2.4 m telescope (LJT+YFOSC) at the Li-Jiang Observatory of Yunnan Observatories. The spectrum is matched to the young 99aa-like type Ia supernova at a few days before the maximum brightness. Cross-correlation with the comparison tool GELATO (Harutyunyan et al. 2008, A&A, 488, 383, https://gelato.tng.iac.es) shows that it matches with SN 1998es at t = -9 days before the maximum. Given a redshift of 0.03076 for the host galaxy IC 1222 (from the measurement of SDSS), an expansion velocity
of about 11500 km/s can be deduced from the absorption minimum of Si II 6355.
