LJT spectroscopic classification of AT 2021aghl as a relatively young Type Ia supernova
ATel #15120; Liping Li (Yunnan University); Jujia Zhang, Qian Zhai (YNAO); Xiaofeng Wang(THU)
on 17 Dec 2021; 01:59 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 2021aghl (350-870nm) that was obtained on 2021 Dec. 16.75 UT with the Lijiang 2.4-m telescope (LJT +YFOSC) at LiJiang observatory of Yunnan Observatories. The spectrum is similar to that of a type Ia supernovae at a few days before the maximum light. Cross-correlation with the library of supernova spectra using the comparison tool SNID (Blondin and Tonry 2007, ApJ, 666, 1024) shows that it matches with SN 2003du at t = -9 days. Given a redshift of 0.045 derived by narrow H-alpha emission of the host galaxy, an expansion velocity of about 13000 km/s can be deduced from the Si II 635.5 absorption minimum.
