Spectroscopic and photometric confirmation of TCP J09370380+1657350 as a WZ Sge-type dwarf nova
ATel #14309; Keisuke Isogai (Kyoto University), Hiroyuki Maehara (National Astronomical Observatory of Japan), Naoto Kojiguchi, Taichi Kato (Kyoto University), Seiichiro Kiyota, Hiroshi Itoh (VSOLJ), Tamas Tordai (VSNET)
on 9 Jan 2021; 12:14 UT
Credential Certification: Keisuke Isogai (isogai@kusastro.kyoto-u.ac.jp)
Subjects: Optical, Cataclysmic Variable, Transient
We report on spectral features seen in the transient TCP J09370380+1657350 on 2021-01-08.878 UT
obtained by using a fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi et al. 2019)
attached to one of the Nasmyth focuses of the 3.8-m telescope Seimei at Okayama Observatory of Kyoto University.
In short, we conclude that this object is a WZ Sge-type dwarf nova.
According to CBAT, the outburst of TCP J09370380+1657350 was discovered at 14.5 mag on 2021-01-07.7850 UT by Yuji Nakamura.
As already reported to vsnet-alert 25211,
the previous outburst was detected in 2006 by CRTS (Drake et al. 2009).
Judging from the outburst amplitude and profile, this object is likely to be a WZ Sge-type dwarf nova.
We secured an optical spectrum on 2021-01-08.878 UT by using KOOLS-IFU.
The spectrum shows
a blue continuum with Hα emission and possible Hβ absorption lines.
These features suggest that this object is a dwarf nova in outburst.
We also obtained time-series photometry via VSNET.
The object has clearly shown typical early superhumps.
The estimated period is 0.0619(1) d (vsnet-alert 25216, 25217).
From our spectrum and photometry, we conclude that this object is a new WZ Sge-type dwarf nova.
Since the estimated period implies that this object could show multiple rebrightenings, continuous time-series photometry is important.
Our Spectrum
