Spectroscopic Classification of SN 2018bgc (=ATLAS18nvs) as a Type Ia Supernova
ATel #11627; Han Lin, Xiaofeng Wang, Danfeng Xiang, Liming Rui (Tsinghua University), Lei Hu, Maokai Hu (PMO), Xinhan Zhang, Xue Li (Tsinghua University), Tianmeng Zhang (NAOC), and Jujia Zhang (YNAO)
on 10 May 2018; 13:37 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)
Subjects: Optical, Supernovae, Transient
We obtained an optical spectrum (range 385-855 nm) of SN 2018bgc(=ATLAS18nvs), discovered by ATLAS, on UT May 08.60 2018 with the 2.16-m telescope (+BFOSC) at Xinglong Station of National Astronomical
Observatories of China (NAOC). The spectrum is consistent with that of a type Ia supernova a few days before the maximum light. Cross-correlation with a library of supernova spectra using the comparison tool SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) shows that it matches with SN 2003kf at t=-4 days from the maximum light. Given a redshift of 0.0313 for its host galaxy MCG +9-14-062, an expansion velocity of about 11300 km/s can be deduced from the Si II 635.5 absorption minimum. Our classification spectrum is also posted on the IAU Transient Name Sever: https://wis-tns.weizmann.ac.il/object/2018bgc
