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Spectroscopic Classification of SN 2017bke as a Type Ia Supernova

ATel #10128; Jujia Zhang, Xiliang Zhang (YNAO), Xiaofeng Wang, Wenxiong Li (Tsinghua University), Bin Li, Zhijian Xu (PMO), Hanjie Tan (CCU), Haibin Zhao, Lifan Wang (PMO), Liming Rui, Zesheng Yang (Tsinghua University))
on 26 Feb 2017; 01:35 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 10129

We obtained an optical spectrum (range 340-880 nm) of SN 2017bke (=PTSS-17hcz),discovered by the PMO-Tsinghua Supernova Survey (PTSS, http://www.cneost.org/ptss/ ), on UT Feb.25.7 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. 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 1999em at t = -7 days from the maximum light. After correcting for a redshift of 0.047 for its host galaxy APMUKS(BJ) B102145.77-032803.1 (from the SNID fit), an expansion velocity of about 14900 km/s can be derived from the absorption minimum of Si II 635.5 nm line. The classification spectrum is also posted on IAU Transient Name Sever: http://wis-tns.weizmann.ac.il/object/2017bke