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LJT Spectroscopic Classification of ASASSN-17fx (=SN 2017dwp) as a young Type Ia Supernova

ATel #10352; Jujia Zhang (YNAO) and Xiaofeng Wang (Tsinghua University)
on 5 May 2017; 19:35 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ju-Jia Zhang (jujia@ynao.ac.cn)

Subjects: Optical, Supernovae

We obtained an optical spectrum (range 350-900 nm) of ASASSN-17fx/SN 2017dwp (ATel#10351) on UT May 5.77 2017 with the Lijiang 2.4 m telescope (LJT+YFOSC) at Lijiang Observatory of Yunnan Observatories (YNAO). The spectrum is consistent with 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 1997dt at t = -11 days from the maximum light. After correcting for a redshift of 0.0333 for its host galaxy 2MASX J12314373+3612331, an expansion velocity of about 13000 km/s can be derived from the absorption minimum of Si II 635.5 nm.