Xinglong 2.16-m Telescope Spectroscopic Classification of SN 2018hfg (=ASASSN-18xk) as a Type IIn Supernova
ATel #12102; Hanna Sai, Xiaofeng Wang, Han Lin, Xinhan Zhang, Danfeng Xiang, Liming Rui(Tsinghua University), Huijuan Wang, Tianmeng Zhang (NAOC), Jujia Zhang (YNAO)
on 11 Oct 2018; 08:59 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)
Subjects: Optical, Supernovae, Transient
We obtained an optical spectrum (range 380-840 nm) of SN 2018hfg (=ASASSN-18xk) in UGC 4642(z=0.023863), discovered by All Sky Automated Survey for Supernova, on UT October 10.8 2018 with the Xinglong 2.16-m telescope (+BFOSC) of National Astronomical Observatories of China (NAOC). The spectrum is consistent with a type IIn supernova at a few days after explosion, with prominent narrow emission line of hydrogen and helium. Cross-correlation with a library of supernova spectra using the comparison tool "GELATO" (Harutyunyan et al., 2008, A&A, 488, 383) shows that it matches with SN 2009ip at t~+7.0 days from the explosion. The full width half maximum (FWHM) of the Ha emission line in velocity is about 1200 km/s. Our classification spectrum is also posted on the IAU Transient Name Sever: https://wis-tns.weizmann.ac.il/object/2018hfg
