The evolution of the asymmetric disk structure of WZ Sge-type dwarf novae
R. Sazaki* and
M. Uemura*: corresponding author
Pre-published on:
March 19, 2026
Published on:
—
Abstract
We report simultaneous optical and near-infrared photometry of the WZ Sge-type dwarf nova TCP J23580961+5502508 during its 2022 superoutburst, obtained with the 1.5-m Kanata telescope. Early superhumps were detected on three consecutive nights. The light-curve profiles were dominated by a single primary maximum on the first two days of our observation, whereas a distinct secondary minimum developed on the third day. Using the early superhump mapping technique, we reconstructed the accretion disk structure from the multi-band light curves. The resulting disk showed a prominent flaring structure on the leading side during the first two days. On the third day, an additional flaring region appeared on the trailing side, forming a two-armed pattern consistent with the structure predicted by the 2:1 resonance model. The disk morphology during the first two days suggests the presence of an additional mechanism operating in the earliest stage of early superhump development, prior to the establishment of the full 2:1 resonance geometry.
DOI: https://doi.org/10.22323/1.493.0015
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