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Spectroscopic Classification of SN 2017mu as a Type Ia Supernova

ATel #10018; Jujia Zhang, Yuxin Xin (YNAO), Xiaofeng Wang, Wenxiong Li, Liming Rui (Tsinghua University), Zhijian Xu, Bin Li, Haibin Zhao, Lifan Wang (PMO), Hanjie Tan (Chinese Culture University) Zesheng Yang, Hao Song (Tsinghua University)
on 28 Jan 2017; 10:55 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 340-800 nm) of SN 2017mu (=PTSS-17dgm), discovered by the PMO-Tsinghua Supernova Survey (PTSS), on UT Jan.26.7 2017 with the 2.4 m telescope (LJT + YFOSC) at LiJiang Observatory of Yunnan Observatories (YNAO). The spectrum is consistent with that of a type Ia supernova 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, ApJ, 666, 1024) shows that it matches with SN 1989B at t = +5 days from the maximum light. After correcting for a redshift of 0.0815 for its host galaxy GALEXASC J093036.72+212437.4 (from the narrow emission lines of Ha and S II 672.2 nm), an expansion velocity of about 9500 km/s can be derived from the absorption minimum of Si II 635.5nm.