Spectroscopic Classification of SN 2017cbr as a Type Ia Supernova
ATel #10197; Jujia Zhang, Jianguo Wang (YNAO), Wenxiong Li, Xiaofeng Wang (Tsinghua University), Hanjie Tan (Chinese Culture University), Tianmeng Zhang, Xu Zhou (NAOC), Jun Mo, Liming Rui, Danfeng Xiang (Tsinghua University)
on 23 Mar 2017; 08:01 UT
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)
Subjects: Optical, Supernovae, Transient
We obtained an optical spectrum (range 340-900 nm) of SN 2017cbr, discovered by the Tsinghua-NAOC Transient Survey (TNTS), on UT Mar.22.7 2017 with the 2.4 m telescope (LJT + YFOSC) at LiJiang
Gaomeigu Observatory of Yunnan Observatories (YNAO). The spectrum is consistent with that of a type Ia supernova at around the maximum light. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, ApJ, 666, 1024) shows that it matches with SN 2003hv at t = +3 days from the maximum light. After correcting for a redshift of 0.0173 for its host galaxy MCG +03-31-007, an expansion velocity of about 10800 km/s can be derived from the absorption minimum of Si II 635.5 nm line. The classification spectrum is also posted on the IAU Transient Name Sever: https://wis-tns.weizmann.ac.il/object/2017cbr/
