Work

On the Evoloutionary Pathway of WZ Sge-type Dwarf Nova GOTO065054.49+593624.51

Year: 2026

Type: conference-paper

Abstract: We observed the dwarf nova system GOTO065054.49+593624.51 (hereafter GOTO0650), and classified its rebrightening behavior as type E and type B (type E means double superoutburst and type B means multiple rebrightenings). Based on the $O-C$ analysis of superhump maxima, we estimated its mass ratio and orbital period as $q$ = 0.073(9) and $P_{\text{orb}}$ = 0.0625(2) d, respectively. These values support the idea that GOTO0650 may follow the standard evolutionary path of cataclysmic variables. However, this object showed an unusually large number of rebrightenings (11 events) and a prolonged active phase of approximately 100 days. To investigate the rebrightening models of systems with multiple rebrightening outbursts including GOTO0650, we conducted a statistical survey from the perspective of the average outburst cycle of rebrightening, defined as the time per rebrightening $T_\text{reb}$ (d). Many of type B objects are in the range of $5 \leq T_\text{reb}\leq9$, suggesting that physical rebrightening mechanism may be common to type B objects. The $T_\text{reb}$ of GOTO0650 is 8.89 d. GOTO0650 is within the normal range in terms of $T_\text{reb}$, so physical mechanisms may be common to at least type B objects and GOTO0650. There are two proposed models of the mechanism of rebrightening, the mass reservoir model and the enhanced mass transfer model. From prior research, $T_{\text{reb}}$ might be linked to binary parameters such as a mass ratio. We examined whether there was any correlation between $T_\text{reb}$ and parameters based on the two models. Both parameters based on the two models exhibited a correlation with $T_\text{reb}$. However, no significant differences were found between the correlations derived from the two models.

DOI: 10.22323/1.493.0045

Authors: Hiromasa Hoke, Keisuke Isogai, Yusuke Tampo, Katsuki Muraoka, Naoto Kojiguchi, Tamás Tordai, Tonny Vanmunster, Stephen M.Brincat, Franz-Josef Hambsch, Daisaku Nogami

Language: English

Topic: Astrophysical Phenomena and Observations

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Funders: National Science Foundation, California Institute of Technology, Trinity College Dublin, Stockholms Universitet, Deutsches Elektronen-Synchrotron, Institut National de Physique Nucléaire et de Physique des Particules

Award: Exploring & Exploiting the Dynamic Optical Sky

OpenAlex ID: W7141637085

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