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Spectroscopic classification of SN 2018iq as a Type Ia Supernova

ATel #11219; Jujia Zhang, Kaixing Lu (YNAO) and Xiaofeng Wang (Tsinghua University)
on 24 Jan 2018; 01:27 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 2018iq (=AT2017jzx), discovered by Koichi Itagaki, on UT 2018 Jan. 20.7 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 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 2005cf at t = -8 days from the maximum light. After correcting for a redshift of 0.0235 of the Host galaxy NGC 2746 an expansion velocity of about 14500 km/s can be derived from the absorption minimum of Si II 635.5 nm. Our classification spectrum is also posted on the IAU Transient Name Sever: https://wis-tns.weizmann.ac.il/object/2018iq