Spectroscopic Classification of AT 2019aik (PSP19A) as a young Type Ia Supernova
Jujia Zhang, Kaixing Lu (YNAO); Xiaofeng Wang (THU)
We obtained an optical spectrum (range 350-870 nm) of AT2019aik(= PSP19A), discovered by the Xingming Observatory Sky Survey (XOSS), on UT Feb. 02.71 2019 with the 2.4 m telescope (LJT + YFOSC) at LiJiang Observatory of Yunnan Observatories (YNAO). The spectrum is consistent with that of a type Ia supernova at a few days before the maximum light. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, ApJ, 666, 1024) shows that it matches with SN 1990O at t = -7 days from the maximum light. After correcting for a redshift of 0.023 for its host galaxy NGC 3304, an expansion velocity of about 13000 km/s can be derived from the absorption minimum of Si II 635.5nm.
optical,supernovae