Classification of SN 2018jag as a Subluminous Type Ia Supernova
ATel #12242; Jujia Zhang, Jianguo Wang (YNAO), Hanjie Tan (NCU), Xiaofeng Wang, Wenxiong Li (THU), Tianmeng Zhang, Xu Zhou (NAOC), Rongxin Wang, Jun Mo (THU), Zhijian Xu
on 27 Nov 2018; 02:48 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)
Subjects: Optical, Supernovae, Transient
We obtained a optical spectrum (range 340-840 nm) of SN 2018jag, discovered by Tsinghua-NAOC Transient Survey, on UT November 26.6 2018 with the Lijiang 2.4-m telescope at Gaomeigu Station of Yunnan
Astronomical Observatories (YNAO). The spectrum is consistent with that of a subluminous type Ia supernova at a few days before the maximum light. Cross correlation with a library of supernova spectra using the GELATO (Harutyunyan et al. 2008, A&A, 488,383) shows that it matched SN 1986G at about t=-3 days before the maximum light. After correcting for a redshift of 0.04 for its host galaxy MCG +02-03-030 (Hopp et al. 1995,A&AS, 109, 537), an expansion velocity of about 12700 km/s can be derived from the absorption minimum of Si II 635.5 nm line.
