Xinglong 2.16-m Telescope Spectroscopic Classification of SN 2019arb as a Subluminous Type Ia Supernova
ATel #12489; Hanna Sai, Xinhan Zhang, Xiaofeng Wang, Han Lin, Danfeng Xiang, Liming Rui(Tsinghua University), Tianmeng Zhang (NAOC), Jujia Zhang (YNAO)
on 10 Feb 2019; 01:44 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 410-870 nm) of SN 2019arb (=ZTF19aahjhoy), discovered by ZTF, on UT Feb. 9.6 2019 with the Xinglong 2.16-m telescope (+BFOSC) of National Astronomical Observatories of China (NAOC). The spectrum is consistent with a subluminous type Ia supernova at a few days 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 mathces with SN 1999by at t = +4.7 days from the maximum light. After correcting for a redshift of 0.014 for its host galaxy SDSS J121932.10+494856.7, an expansion velocity of about 10900 km/s can be derived from the absorption minimum of Si~II 635.5 nm line.
