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Spectroscopic classification of SN 2018K as a type Ia supernova

ATel #11138; Jujia Zhang, Liang Xu (YNAO) and Xiaofeng Wang (Tsinghua University)
on 7 Jan 2018; 13:47 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 SN 2018K on UT Jan. 7.48 2018 with the Lijiang 2.4 m telescope (LJT+YFOSC) at Lijiang Observatory of Yunnan Observatories (YNAO). The spectrum is consistent with an SN Ia 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 2007F at t = -8 days from the maximum light. After correcting for a redshift of 0.023 for its host galaxy UGC 01303, an expansion velocity of about 12000 km/s can be derived from the absorption minimum of Si II 635.5 nm. The spectrum is available on Transient Name Server (TNS, https://wis-tns.weizmann.ac.il/object/2018k).