
TL;DR
This paper reviews the properties, classification, and evolution of WZ Sge-type dwarf novae, highlighting the significance of early superhumps, rebrightenings, and superhump period analysis in understanding their characteristics and evolutionary stages.
Contribution
It provides an updated list of WZ Sge-type dwarf novae, analyzes their superhump behavior, and proposes an evolutionary sequence based on mass ratios and superhump stages.
Findings
Early superhumps detected in 63% of studied objects.
Linear relation between superhump period variation and mass ratio.
Identified evolutionary sequence of outburst types.
Abstract
We have summarized the current understanding and recently obtained findings about WZ Sge-type dwarf novae. We also reviewed the historical development of the understanding of these objects, provided the modern criteria, and reviewed the past research in relation to superhumps, early superhumps and the outburst mechanism. We regard that the presence of early superhumps (reflecting the 2:1 resonance) and long or multiple rebrightenings are the best distinguishing properties of WZ Sge-type dwarf novae. We provided the updated list of nearly 100 WZ Sge-type dwarf novae mainly based on the data obtained by the VSNET Collaboration up to Kato et al. (2015, arXiv/1507.05610) and discussed the statistics. We could detect early superhumps with amplitude larger than 0.02 mag in 63% of the studied WZ Sge-type dwarf novae, which makes early superhumps a useful distinguishing feature for WZ Sge-type…
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