Spectroscopic classification of the transient ZTF20acufmah = AT 2020abfk as a dwarf nova
ATel #14258; Kenta Taguchi, Keisuke Isogai, Miho Kawabata, Masayuki Yamanaka (Kyoto University)
on 10 Dec 2020; 08:22 UT
Credential Certification: Keisuke Isogai (isogai@kusastro.kyoto-u.ac.jp)
Subjects: Optical, Cataclysmic Variable, Transient, Variables
We report on a spectrum of the transient ZTF20acufmah = AT 2020abfk. We obtained the spectrum on 2020-12-01.72 UT by using a fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi et al. 2019) mounted on the 3.8-m telescope Seimei at Okayama Observatory of Kyoto University.
As reported to TNS, this object was discovered by ZTF at g=19.48 mag on 2020-11-29.22. It was not detected on 2020-11-27.38 by orange-ATLAS (limiting mag = 18.88). After that, this object brightened to g = 15.32 on 2020-12-01.19 and r = 15.22 on 2020-12-01.29. According ASAS-SN sky patrol (Shappee et al. 2014 and Kochanek et al. 2017), past outburst was found on 2016 (peak V = 15.221 on 2016-01-29.27). There is a PanSTARRS counterpart at g = 21.9.
Our spectrum shows blue continuum and an emission line of Hα (FWHM ∼ 15 Å). Other lines are not there, or cannot be distinguished from the noise.
These features favor this object as a dwarf nova.
Our Spectrum
