Spectroscopic identification of ASASSN-20kw = AT 2020scy as a dwarf nova
ATel #13975; Kenta Taguchi, Kosuke Namekata, Soshi Okamoto, Naoto Kojiguchi, Keisuke Isogai (Kyoto University), Hiroyuki Maehara (National Astronomical Observatory of Japan)
on 28 Aug 2020; 02:50 UT
Credential Certification: Keisuke Isogai (isogai@kusastro.kyoto-u.ac.jp)
Subjects: Optical, Cataclysmic Variable, Transient, Variables
We report on a spectrum of the bright optical transient ASASSN-20kw = AT 2020scy. We obtained the spectrum on 2020-08-27.83 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 at 14.9 mag on 2020-8-27.57 UT by ASAS-SN (Shappee et al. 2014). There is a possible counterpart in the PS1 image but is no photometry data (the limiting magnitude is ~23).
Our spectrum shows weak Balmer absorption lines. Through our performed plain flux calibration, we found that the continuum of this object is blue. These features suggest that this object is a dwarf nova in outburst, not a classical nova. The large amplitude suggests that the object is WZ Sge-type dwarf nova.
Spectrum
