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Spectroscopic classification of PTSS-17xqa (SN 2017him) as a type Ia supernova

ATel #10912; J.-J. Zhang, L. Xu (YNAO); X. F., Wang, W.-X., Li (THU); H.-J. Tan (CCU), B. Li, Z.-J. Xu, H.-B. Zhao, L.-F. Wang (PMO); D.-F. Xiang, L.-M. Rui, H. Lin (THU)
on 31 Oct 2017; 08:13 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ju-Jia Zhang (jujia@ynao.ac.cn)

Subjects: Optical, Supernovae, Transient

We obtained an optical spectrum (range 360-870 nm) of PTSS-17xqa (SN 2017him), discovered by the PMO-Tsinghua Supernova Survey (PTSS, http://www.cneost.org/ptss/ ), on UT 2017 Oct. 29.7 with the Li-Jiang 2.4 m telescope (LJT+YFOSC) at Li-Jiang Observatory of Yunnan Observatories. The spectrum is consistent with that of? a type Ia supernova at a few days after 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 2007ca at t = +13 days from the maximum light. After correcting for a redshift of 0.051 (via Narrow H alpha emission in the spectrum) an expansion velocity of about 9100 km/s can be derived from the absorption minimum of Si II 635.5 nm.