Xinglong 2.16-m Telescope Spectroscopic Classification of MASTER OT J082017.38+205232.2 as a Type IIb Supernova
ATel #12133; Hanna Sai, Xiaofeng Wang, Han Lin, Xinhan Zhang, Danfeng Xiang, Liming Rui(Tsinghua University), Juanjuan Ren, Tianmeng Zhang (NAOC), Jujia Zhang (YNAO)
on 20 Oct 2018; 12:14 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 #: 12191
We obtained an optical spectrum (range 390-860 nm) of MASTER OT J082017.38+205232.2 in UGC 04344 discovered by MASTER-Kislovodsk auto-detection system(Atel#12038), on UT Oct 19.8 2018 with the 2.16-m telescope (+BFOSC) at Xinglong Station of National Astronomical Observatories of China (NAOC). The spectrum is consistent with that of a type IIb supernova at a few weeks after the maximum light. 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 2011fu at t=+41 days from the explosion. After correcting for a redshift of 0.0168 for its host galaxy UGC 04344, an expansion velocity of about 9600 km/s can be derived from the absorption minimum of Ha line.
