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Spectroscopic Classification of SN 2017nh as a Type Ia Supernova

ATel #9997; Liming Rui, Xiaofeng Wang, Danfeng Xiang (Tsinghua University), Hong Wu, Junjun Jia, Meng Zhai, Tianmeng Zhang (NAOC), and Jujia Zhang (YNAO)
on 25 Jan 2017; 04:15 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 2017nh (=ASASSN-17bc), discovered by the All Sky Automated Survey for SuperNovae,on UT Jan.24.6 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 around 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 2004eo at t~ +2 days from the maximum light. After correcting for a redshift of 0.061 (from the SNID fit) for its host galaxy 2MASX J07101346+2712041, an expansion velocity of about 10300 km/s can be derived from the absorption minium of Si II 635.5 line.