Volume 493 - 87th Fujihara Seminar：The 50th Anniversary Workshop of the Disk Instability Model in Compact Binary Stars (DIM50th2025) - session 6: Poster presentation
Evolution of the WZ Sge accretion disk throughout quiescence
P. Kvist*, V. Neustroev and V. Suleimanov
*: corresponding author
Full text: pdf
Pre-published on: March 19, 2026
Published on: —
Abstract
Properties of accretion disks remain poorly understood in low mass-transfer rate systems such
as WZ Sge-type dwarf novae. In particular, the long recurrence intervals from years to decades
are challenging to explain. WZ Sge, the prototype of WZ Sge-type dwarf novae, is expected to
undergo a superoutburst in the near future. To investigate its state before the outburst, we observed
it in 2024 with the Nordic Optical Telescope and in 2025 with X-Shooter of ESO/VLT. We
compare these new data with archival data from the current quiescent period to trace the spectral
evolution during quiescence. We found a stable continuum with remarkably evolving emission
lines throughout the first decade after the previous superoutburst. Furthermore, we estimate the
physical parameters of the accretion disk using a two-component hydrogen slab model.
DOI: https://doi.org/10.22323/1.493.0042
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