LJT Spectroscopic classification of ATLAS20bcgx (AT 2020uoo) as a 91T-like type Ia supernova before the peak brightness
ATel #14058; Jujia Zhang (YNAO), Xiaofeng Wang (THU)
on 1 Oct 2020; 14:46 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 ATLAS20bcgx (AT 2020uoo), discovered by ATLAS, on UT 2020 Oct. 1.5 with the Li-Jiang 2.4 m telescope (LJT+YFOSC) at Li-Jiang Observatory of Yunnan Observatories. The spectrum is consistent with that of a 91T-like SN Ia 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 2005hj at t = -4 days from the maximum light. After correcting for a redshift of 0.0319 (via the measurement of the host galaxy from SDSS), an expansion velocity of about 11000 km/s can be derived from the absorption minimum of Si II 635.5 nm. The suspected observation at about 608.5 nm (in observed-frame) might due to the host Na I D that could indicate a significant host extinction.
