TCP J05384230+7051377: double superoutburst

Itoh-san,  Funada-san, Hiraga-san, Sano-san, Stephen, Josch, David reported the observations. The last night's data showed a rapid fading. Superhump until 2025/11/17 (UT) is not (stage A) superhump but likely early superhump.  This behavior must be a double superoutburst, the characteristic of a period bouncer. Thus, this object will show another superoutburst within a few days or one week. Since it is uncertain that when this object will re-bright, continuous observation is very important. If there is data of  during increase brightness, we can estimate its binary parameters.

Further continuous observations are strongly encouraged. Snapshots are also very welcome.

best regard, Hiromasa Hoke

On 2025/11/16 19:45, Keisuke Isogai wrote:

TCP J05384230+7051377: possible period bouncer

Itoh-san reported the observations. The possible period of the early superhump is ~0.065 d, and this value implies that this object is a period bouncer. The last night's data shows likely growing (stage A) superhumps. The dense observations in this period will reveal whether this object is indeed a period bouncer.

On 2025/11/10 8:58, 保家大将 wrote:

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TCP J05384230+7051377: new WZ Sge-type dwarf nova

We posted our spectroscopic follow-up result of TCP J05384230+7051377 to ATel. ATel #17485: Spectroscopic confirmation of TCP J05384230+7051377 as a WZ Sge-type dwarf nova https://www.astronomerstelegram.org/?read=17485

We concluded that this object is a new WZ Sge-type dwarf nova because Hα has a narrow emission core and its spectrum shows a blue continuum with the Balmer and HeI absorption lines.

Also, we estimated this object as p ~ 0.06d from Itoh-san's data. However p ~ 0.06d is a weak signal, so further observation will provide a more accurate estimate of the period.

best regard, Hiromasa Hoke