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Spectroscopic Classification of SN 2017ms as a Type Ia Supernova

ATel #9991; Jujia Zhang, Xiangming Zheng (YNAO), Xiaofeng Wang, Wenxiong Li, Liming Rui (Tsinghua University), Zhijian Xu, Bin Li, Haibin Zhao, Lifan Wang (PMO), Hanjie Tan (Chinese Culture University), Feng Xiao, Tianmeng Zhang (NAOC)
on 24 Jan 2017; 01:20 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 330-870 nm) of SN 2017ms(= PTSS-17dfc), discovered by the PMO-Tsinghua Supernova Survey (PTSS), on UT Jan.23.88 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 a few days before 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 2003du at t = -3 days from the maximum light. After correcting for a redshift of 0.0246 for its host galaxy SDSS J102641.99+364053.2, an expansion velocity of about 11700 km/s can be derived from the absorption minimum of Si II 635.5nm.