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Spectroscopic Classification of SN 2018if as a Broadlined Type Ic Supernova

ATel #11213; Jujia Zhang, Kaixin Lu (YNAO), Xiaofeng Wang, Zhijian Xu, Wenxiong Li (Tsinghua University), Tianmeng Zhang (NAOC), and Hanjie Tan (Chinese Culture University), Zhitong Li, Hao Song, and Jun Mo (Tsinghua University)
on 22 Jan 2018; 09:26 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 11295

We obtained an optical spectrum (range 350-916 nm) of SN 2018if,discovered by the Tsinghua-NAOC Transient Survey, on UT Jan. 20.7 2018 with the Lijiang Gaomeigu 2.4-m telescope (+YFOSC) at Lijiang Station of Yunnan Observatories of China. The spectrum is consistent with that of a broadlined (BL) type Ic supernova at around the maximum light. Cross-correlation with a library of supernova spectra using the GELATO (Harutyunyan et al. 2008, A&A, 488, 383) tool shows that it matches with SN 2003jd at t=-2.5 days from the maximum light. The absorption feature near 627 nm appears to be more prominent when compared to other BL SNe Ic, and it could be due to Ha, Ne I, C II, or their blending. Our classification spectrum is also posted on the IAU Transient Name Sever: https://wis-tns.weizmann.ac.il/object/2018if