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Spectroscopic Classification of SN 2018zd as a very young Type IIn Supernova

ATel #11379; Jujia Zhang, Liang Xu (YNAO) and Xiaofeng Wang (THU)
on 6 Mar 2018; 03:44 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ju-Jia Zhang (jujia@ynao.ac.cn)

Subjects: Optical, Supernovae

Referred to by ATel #: 11405, 11411

We report an optical spectrum (range 350-900nm) of SN 2018zd, discovered by Koichi Itagaki, that was obtained on UT Mar. 5.7 2018 with the 2.4-m telescope (+YFOSC) at LiJiang Observatory of Yunnan Observatories. This spectrum is consistent with a type IIn supernova at relatively early phase. The strong Na ID absorption (~4.2 angstrom) feature in the spectra indicates that it suffered significant reddening due to MW or host galaxy. Cross-correlation with a library of supernova spectra using the comparison tool SNID ((Blondin and Tonry 2007, ApJ, 666, 1024) shows that it matches with SN 1998s at t = -13 days.