LJT spectroscopic classification of AT 2022erq as a young SN 2005gj-like supernova
ATel #15275; Liping Li (Yunnan University); Qian Zhai, Jujia Zhang(YNAO); Xiaofeng Wang(THU)
on 13 Mar 2022; 07:58 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 2022erq (350-870nm) obtained on 2022 Mar. 12.9 UT with the Lijiang 2.4-m telescope (LJT +YFOSC) at LiJiang observatory of Yunnan Observatories. The spectrum is similar to the Ia-csm/IIn event at the early phase, e.g., SN 2005gj = 12d after the explosion via Gelato (Harutyunyan et al. 2008) or SN 2005gj = -12d before the peak via SNID (Blondin & Tonry 2007).
The photometric analysis matches the spectroscopic result. AT 2022erq was discovered at about 18.1 mag with ATLAS-cyan band on Mar. 11.6. The photometry obtained by LJT on Mar. 12.9 (g = 17.43 \pm 0.02, r = 17.51\pm 0.01, i = 17.62 \pm 0.02) shows a fast-rising of this transient. Given the redshift z = 0.066 (from the H-Balmer emissions), the absolute magnitude of 2022erq is close to -20mag during LJT observation without reddening correction. The fast-rising and high luminosity consistent the light curve of SN 2005gj a few days before the peak.
