Xinglong 2.16-m Telescope Spectroscopic Classification of AT 2019ehp in NGC 4162 as a Young Type IIP Supernova
ATel #12708; Hanna Sai, Xinhan Zhang, Xiaofeng Wang, Han Lin (Tsinghua University), Huijuan Wang, Tianmeng Zhang (NAOC), Jujia Zhang (YNAO)
on 1 May 2019; 00:59 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 430-870 nm) of AT 2019ehp (in NGC 4162) discovered by the ATLAS, on UT Apr.30.7 2019 with the Xinglong 2.16-m telescope (+BFOSC) of National Astronomical Observatories of China (NAOC). The spectrum is consistent with a type II supernova at a few days after explosion, showing prominent, broad P-Cygni lines of hydrogen. Cross-correlation with a library of supernova spectrum using the comparison tool "GELATO" (Harutyunyan et al., 2008, A&A, 488,383) shows that it matches with SN 1999em at t = +5.0 days from the explosion. After correcting for a redshift of 0.0086 for its host galaxy NGC 4162, an expansion velocity of about 11500 km/s can be derived from the absorption minimum of Ha line.