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Spectroscopic Classification of MASTER OT J081506.13+381123.3 as a Type Ia Supernova

ATel #9984; Liming Rui, Wenxiong Li, Zhihao Chen, Danfeng Xiang, Xiaofeng Wang (Tsinghua University), Tianmeng Zhang (NAOC), Jichen Zhang (No. 101 High School of Beijing), Ziyan Zhang (Beijing National Day School), Zhe Luo (No. 80 High School of Beijing), Can Cui, Yaxin Li (Pingguoyuan High School Attaced to CNU), Xinhang Shen (No. 55 High School of Beijing))
on 22 Jan 2017; 03:00 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 360-860 nm) of MASTER OT J081506.13+381123.3 (see ATEL #9971), discovered by MASTER robotic Net, on UT Jan.20.6 2017 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 supernovae at a few days after the maximum light. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J., 666, 1024) shows that it matches with SN 2002er at t~ +4 days from the maximum light. After correcting for a redshift of 0.054 (from the SNID fit) for its host galaxy PGC 2120251, an expansion velocity of about 11200 km/s can be derived from the absorption minium of Si II 635.5 line.