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Spectroscopic Classification of SN 2017cff (=PTSS-17nem) as a Young Type IIP Supernova

ATel #10186; Jujia Zhang, Yuxin Xin (YNAO), Zhijian Xu, Wenxiong Li, Xiaofeng Wang (Tsinghua University), Bin Li, Haibin Zhao, Lifan Wang (PMO), Hanjie Tan (Chinese Culture University), Liming Rui, and Danfeng Xiang (Tsinghua University)
on 20 Mar 2017; 03:16 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 340-900 nm) of SN 2017cff (=PTSS-17nem), discovered by the PMO-Tsinghua Supernova Survey (PTSS, http://www.cneost.org/ptss/ ), on UT Mar.19.76 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 young type IIP 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 2004et at t = -3 days from the maximum light. After correcting for a redshift of 0.019 for its host galaxy GALEXASC J133917.08+350841.1 (from the SNID fit), an expansion velocity of about 11000 km/s can be derived from the absorption minimum of H_alpha line. The classification spectrum is also posted on the IAU Transient Name Sever: https://wis-tns.weizmann.ac.il/object/2017cff/