Late Superhumps in WZ Sge-Type Dwarf Novae

Taichi Kato; Hiroyuki Maehara; Berto Monard

doi:10.1093/pasj/60.4.L23

Late Superhumps in WZ Sge-Type Dwarf Novae

Astrophysics 2015-05-13 v1

Authors: Taichi Kato , Hiroyuki Maehara , Berto Monard

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Abstract

We report on the detection of very stable modulations with periods unexpectedly (~0.5%) longer than superhump periods during the slowly fading stage of WZ Sge-type superoutbursts in three systems, GW Lib, V455 And and WZ Sge. These periods are naturally explained by assuming that these modulations are superhumps arising from matter near the tidal truncation radius. This finding provides an additional support to the hypothetical idea of expansion of the accretion disk well beyond the 3:1 orbital resonance in some low mass-ratio systems. Combined with the effect of 2:1 resonance, we present an explanation of the origin of positive period derivatives in certain short-period SU UMa-type dwarf novae.

Keywords

dwarf nova superoutbursts nova outbursts cataclysmic variable orbital periods

Cite

@article{arxiv.0806.4248,
  title  = {Late Superhumps in WZ Sge-Type Dwarf Novae},
  author = {Taichi Kato and Hiroyuki Maehara and Berto Monard},
  journal= {arXiv preprint arXiv:0806.4248},
  year   = {2015}
}

Comments

Accepted by PASJ (Letters), 4 pages, 3 figures

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