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Spectroscopic Classification of SN 2017lf as a Highly Reddened Type Ia Supernova

ATel #9994; Liming Rui, Yuanhao Wang, Wenxiong Li, Xiaofeng Wang (Tsinghua University), Zhibin Dai (YNAO), Tianmeng Zhang, Xu Zhou, Feng Xiao (NAOC), Hanjie Tan(Chinese Culture Unviersity), Zhijian Xu, Danfeng Xiang, Jun Mo, Hao Song (Tsinghua University)
on 24 Jan 2017; 13:27 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 380-870 nm) of SN 2017lf, discovered by the Tsinghua-NAOC Transient Survey (TNTS) and iPTF independently,on UT Jan.23.6 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 after 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 1996X at t~ +8 days from the maximum light. The red continuum and strong Na I D absorption feature indicate that this supernova sufferred significant reddening along the line of sight. After correcting for a redshift of 0.0146 for its host galaxy NGC 1233, an expansion velocity of about 10700 km/s can be derived from the absorption minium of Si II 635.5 line.