Spectral classification of ATLAS19ggw (AT2019dhc) as a young type II supernova
ATel #12653; Jujia Zhang, Xiaoguang Yu (YNAO) and Xiaofeng Wang (THU)
on 11 Apr 2019; 21:57 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ju-Jia Zhang (jujia@ynao.ac.cn)
Subjects: Optical, Supernovae
We obtained an optical spectrum (range 350-880 nm) of ATLAS19ggw (AT2019dhc, ATEL #12650) on UT Apr. 11.7 2019 with the 2.4 m telescope (LJT + YFOSC) at Lijiang Observatory of Yunnan Observatories (YNAO). The spectrum is blue and relatively featureless, with broad, low-contrast hydrogen Balmer emission lines suggesting a type II SN at its early phase. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that matches with the type-II SN 1999gi at t=-5 days.
