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Spectroscopic Classifications of SN 2018pr and SN 2018pt

ATel #11286; Jujia Zhang, Jianguo Wang (YNAO); Wenxiong Li, Xiaofeng Wang (THU); Zhijian Xu; Hanjie Tan (CCU); Tianmeng Zhang, Xu Zhou (NAOC); Jun Mo, Liming Rui, Danfeng Xiang, and Han Lin (THU)
on 10 Feb 2018; 14:00 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ju-Jia Zhang (jujia@ynao.ac.cn)

Subjects: Optical, Supernovae

We report the following spectroscopic classifications for the transients detected by the Tsinghua-NAOC Transient Survey (SN 2018pr and SN 2018pt). All spectra were obtained on UT 2018 Feb. 9.7 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 2018pr contaminated by the host galaxy matches with the normal type Ia supernova SN 2007ca at t = +9 days relative to the maximum light. Given a redshift of 0.092 for its host galaxy (From narrow Ha emission in spectrum), an expansion velocity of about 10000 km/s can be deduced from the Si II 635.5 absorption minimum. The classification spectrum is posted on the IAU Transient Name Sever: https://wis-tns.weizmann.ac.il/object/2018pr. (2) The spectrum of SN 2018pt matches with the 91T-like type Ia supernova SN 2005eq at t = -4 days relative to the maximum light. Given a redshift of 0.127 (from SNID fit) for its host galaxy, an expansion velocity of about 9300 km/s can be deduced from the Si II 635.5 absorption minimum, and the absolute brightness of this SN is about -20.2 mag. The classification spectrum is posted on the IAU Transient Name Sever: https://wis-tns.weizmann.ac.il/object/2018pt.