Activity of five WZ Sge-type systems in a few years after their outbursts

TL;DR

This study investigates the activity and characteristics of five WZ Sge-type dwarf novae over several years post-outburst, revealing changes in pulsations, orbital periods, and light curve behaviors.

Contribution

It provides new observational data on long-term post-outburst activity of WZ Sge-type systems, including pulsation regularity, orbital parameters, and light curve features.

Findings

Emergence of nonradial pulsations in SDSS J080434.20+510349.2 ceased to be regular after 3 years.

Orbital period of V1108 Her determined as 0.05672 days with a mass ratio of 0.09.

High-amplitude quasiperiodic light variations observed in ASAS J0025.

Abstract

We present results of observations and analysis of five WZ-type dwarf novae: SDSS J080434.20+510349.2, SDSS J102146.44+234926.3, V1108 Her, ASAS J0025 and WZ Sge in 3 - 7 years after their outbursts. We found: 1) the observational evidences that emerging of the white dwarf nonradial pulsation in SDSS J080434.20+510349.2 [1] is no longer a regular since 3-rd year after 2006 outburst; 2) the true value of orbital period for V1108 Her (0.05672 d) and mass ratio (0.09); 3) The main feature of quiescent light curves of ASAS J0025 is the high-amplitude quasiperiodical light variations probably originated in accretion disk; 4) in SDSS J102146.44+234926.3 in some occasions the brightness is modulated by period of 0.01367 day or with the multiple of it. The main brightness modulation of J080434.20+510349.2, V1108 Her and WZ Sge is the orbital one and has two-humped shape.