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Spectroscopic Classification of SN 2017ixg as a young Type Ia Supernova with detached HVF of Si II 6355

ATel #11065; Jujia Zhang, Xiaoguang Yu (YNAO); Xiaofeng Wang (THU)
on 16 Dec 2017; 01:13 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 340-900 nm) of SN 2017ixg (ATLAS17nrq), discovered by ATLAS and TNTS, on UT Dec. 15.6 2017 with the Li-Jiang 2.4 m telescope (LJT + YFOSC) at Li-Jiang Observatory of Yunnan Observatories (YNAO). The spectrum is consistent with that of a young 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 2006gr at t = -10 days from the peak light. After correcting for a redshift of 0.0277 (via the narrow H-alpha, S II and N II emissions in the spectrum), the expansion velocities of about 15000km/s and 22000km/s can be derived from the photospheric component and high velocity component of Si II 6355, respectively. Besides, the velocity of Ca II NIR triplet reaches a velocity at about 28000km/s.