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Spectrocopic classification of SN 2017glx (PSP17B) as a young 91T-like type Ia supernova

ATel #10707; Jujia Zhang, Kaixin Lu (YNAO), Xiaofeng Wang, Danfeng Xiang, Liming Rui, Han Lin (Tsinghua University), and Zhijian Xu
on 5 Sep 2017; 10:58 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 350-890 nm) of SN 2017glx (PSP17B), discovered by XOSS, on UT 2017 Sep. 04.7 with the Li-Jiang 2.4 m telescope (LJT+YFOSC) at Li-Jiang Observatory of Yunnan Observatories. The spectrum characterized by a blue continuum and prominent Fe III and Fe II lines is well matched to the 91T-like events at the early phase. 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 1991T at t = -8 days. Given a redshift of 0.011 for the host galaxy NGC 6824, an expansion velocity of about 11000 km/s can be deduced from the Fe III 5129, 5158 absorption minimum.