Spectroscopic and photometric confirmation of TCP J00003597+1757408 as a WZ Sge-type dwarf nova
ATel #16694; Keisuke Isogai, Naoto Kojiguchi (Kyoto University), Yusuke Tampo (South African Astronomical Observatory, University of Cape Town), Franz-Josef Hambsch (GEOS, BAV, VVS)
on 6 Jul 2024; 23:14 UT
Credential Certification: Keisuke Isogai (isogai@kusastro.kyoto-u.ac.jp)
Subjects: Optical, Binary, Cataclysmic Variable, Transient, Variables
We report on spectral features seen in the transient TCP J00003597+1757408 on 2024-07-06.654 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 J00003597+1757408 was discovered at 11.9 mag on 2024-07-05.7062 UT by Yuji Nakamura. There is a likely counterpart in Pan-STARRS and GALEX, whose brightness is g=20.0, r=20.0, i=20.1, z=20.3, y=20.3, FUV=21.6, and NUV=20.6. Judging from the outburst amplitude and the brightness of the likely counterpart, this object is expected to be a WZ Sge-type dwarf nova.
We obtained an optical spectrum on 2024-07-06.654 UT by using KOOLS-IFU. The quick look spectrum shows a blue continuum with the Balmer emission superimposed in the broad Balmer absorption. We also performed time-series photometry. The object has shown double-peaked modulations. The estimated period is 0.0569(1) d. From these results, we conclude that this object is a new WZ Sge-type dwarf nova.
Our spectrum
