Spectroscopic Classification of SN 2017enx as a Type Ia Supernova

ATel #10504; Syed Uddin (Purple Mountain Observatory), Jeremy Mould (Swinburne University of Technology), Ju-Jia Zhang (Yunnan Observatories), Lifan Wang (Purple Mountain Observatory and TAMU), Xiaofeng Wang (Tsinghua University)
on 19 Jun 2017; 00:00 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)

Subjects: Optical, Supernovae, Transient

On UT June 15.1 2017, we obtained a spectrum of the nuclear transient AT2017enx/ASASSN-17hk (ATel #10474) in the galaxy ESO 092-G014 with the Wide Field Spectrograph (WiFeS - Dopita et al., 2007, ApSS, 310, 255) on board 2.3m ANU telescope at Siding Spring Observatory. We classify the transient as a Type Ia Supernova near the maximum light. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (Blondin & Tonry, 2007, ApJ, 666, 1024) shows that this supernova matches with SN2007af at t=+3 days from the peak. After correcting for a redshift 0.006 for its host galaxy ESO 92-G14, an expansion velocity of about 10600 km/s can be measured from the absorption minimum of Si II 635.5 nm line.