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Spectroscopic Classification of SN 2017mf as a Type Ia Supernova

ATel #9986; Jujia Zhang, Xiangming Zheng (YNAO), and Xiaofeng Wang (Tsinghua University)
on 23 Jan 2017; 02:47 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 9987

We obtained an optical spectrum (range 340-900 nm) of SN 2017mf, discovered by Fabio Briganti and Paolo Campaner (ISSP), on UT Jan.22.95 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 at a few days before the maximum light. 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 2003cg at t = -3 days from the peak light. After correcting for a redshift of 0.0257 for its host galaxy NGC 5541, an expansion velocity of about 10700 km/s can be derived from the absorption minimum of Si II 635.5nm.