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Spectroscopic Classification of SN 2017ejd (=PTSS-17tal) as a Type Ia Supernova

ATel #10445; Danfeng Xiang, Kaicheng Zhang, Liming Rui, Xiaofeng Wang, Wenxiong Li (Tsinghua University), Hanjie Tan (Chinese Culture University), Bin Li (PMO), Zhijian Xu, Haibin Zhao (PMO), Lifan Wang (PMO/TAMU), Junjun Jia, Tianmeng Zhang(NAOC), Jujia Zhang (YNAO) Feng Xiao, Tianmeng Zhang (NAOC), and Jujia Zhang (YNAO)
on 31 May 2017; 10:57 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 360-850 nm) of SN 2017ejd(=PTSS-17tal), discovered by the PMO-Tsinghua Supernova Survey (PTSS,http://www.cneost.org/ptss/ ), on UT May 30.7 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 supernova a few days before peak brightness. 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 2003hv at about 2 days before the maximum light. After correcting for a redshift of 0.03383 for its host galaxy 2MASX J14430777+0105599, an expansion velocity of about 10900 km/s can be derived from the absorption minium of Si II 635.5 nm line. Our classification spectrum is also posted on the IAU Transient Name Sever: http://wis-tns.weizmann.ac.il/object/2017ejd/