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Spectroscopic Classification of SN 2017yi as a Type Ia Supernova

ATel #10039; Liming Rui, Xiaofeng Wang, Danfeng Xiang, Wenxiong Li (Tsinghua University), Junjun Jia, Min He, Tianmeng Zhang, Zhenyu Wu (NAOC), and Jujia Zhang (YNAO)
on 2 Feb 2017; 08:43 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 370-850 nm) of SN 2017yi, discovered by J. Vales,on UT Feb.01.5 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 supernovae at about one week before the maximum light. 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 2003du at t~ -9 days from the maximum light. After correcting for a redshift of 0.034 (from the SNID fit) for its host galaxy 2MASX J02592769+1447417, an expansion velocity of about 12000 km/s can be derived from the absorption minium of Si II 635.5 line.