LJT Spectroscopic Classification of ATLAS19ltg (= AT2019gbx) as a Young Type Ia Supernova
ATel #12823; Jujia Zhang, Kaixing Lu (YNAO); Xiaofeng Wang (THU)
on 30 May 2019; 22:28 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ju-Jia Zhang (jujia@ynao.ac.cn)
Subjects: Optical, Supernovae
We report an optical spectrogram (range 350-880 nm) of ATLAS19ltg (= AT2019gbx) that was obtained on 2019 May 30.7 UT with the 2.4 m telescope (LJT + YFOSC) at Lijiang Observatory of Yunnan Observatories (YNAO). The spectrum is similar to that of a type Ia supernovae in very early phase. Cross-correlation with a library of supernova spectra using the comparison tool SNID (Blondin and Tonry 2007, ApJ, 666, 1024) shows that it matches with SN 1994D at t = -11 days. Given a redshift of 0.013 for the host galaxy, MCG -2-33-17, an expansion velocity of above 17000 km/s can be deduced from the Si II 635.5 absorption minimum. And the velocity of Ca II IR triplet can reach to about 23000km/s in this spectrum. Given the discovery photometry reported in the astronote 2019-19 the real phase of this SN might be younger than 11 days before the peak. Follow up observations are encouraged.
