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Spectroscopic Classifications of SN 2018pc, SN 2018pn and SN 2018oh

ATel #11267; Jujia Zhang, Yuxin Xin (YNAO), Wenxiong Li, Xiaofeng Wang (Tsinghua University), Hanjie Tan (Chinese Culture University), Tianmeng Zhang, Xu Zhou (NAOC), Jun Mo, Liming Rui, Danfeng Xiang (Tsinghua University)
on 7 Feb 2018; 09:30 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ju-Jia Zhang (jujia@ynao.ac.cn)

Subjects: Optical, Supernovae

Referred to by ATel #: 11268

We report the following spectroscopic classifications for the transients detected by the Tsinghua-NAOC Transient Survey (SN 2018pc and SN 2018pn) and All Sky Automated Survey for SuperNovae (ASASSN-18bt = SN 2018oh). All spectra were obtained on UT 2018 Feb. 7.7 with the 2.4 m telescope (LJT+YFOSC) at Lijiang Observatory of Yunnan Observatories. Based on the spectral comparison tools SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) the classifications were given as: (1) The spectrum of SN 2018pc matches with the normal type Ia supernova SN 2004fz at t = -7 days relative to the maximum light. Given a redshift of 0.009 for its host galaxy, an expansion velocity of about 11500 km/s can be deduced from the Si II 635.5 absorption minimum; (2) The spectrum of SN 2018pn matches with the type IIP supernova SN 2004dj at t = +0 days relative to the maximum light. Given a redshift of 0.048 (from SNID fit) for its host galaxy, an expansion velocity of about 5500 km/s can be deduced from the Ha absorption minimum; (3) The spectrum of ASASSN-18bt (= SN 2018oh) matches with the normal type Ia supernova SN 2003du at t = -8 days relative to the maximum light. Given a redshift of 0.012 for its host galaxy, an expansion velocity of about 11000 km/s can be deduced from the Si II 635.5 absorption minimum.