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Spectroscopic Classification of SN 2017ckp as a Type Ia Supernova

ATel #10246; Jujia Zhang (YNAO), Xiaofeng Wang, Zhijian Xu, Wenxiong Li (THU), Bin Li (PMO), Zesheng Yang (Tsinghua University), Hanjie Tan(Chinese Culture University), Haibin Zhao, Lifan Wang (PMO)
on 6 Apr 2017; 08:54 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 2017ckp (=PTSS-17npa), discovered by the PMO-Tsinghua Supernova Survey (PTSS, http://www.cneost.org/ptss/ ), on UT Apr.05.82 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 2007co at t = +5 days from the maximum light. After correcting for a redshift of 0.106 (from the SNID fit) for its host galaxy SDSS J142407.50+350317.0, an expansion velocity of about 12200 km/s can be derived from the absorption minimum of Si II 635.5 line. The classification spectrum is also posted on the IAU Transient Name Sever: http://wis-tns.weizmann.ac.il/object/2017ckp/