Superhump evolution of WZ Sge-type dwarf nova ASASSN-14cv at rebrightening stage

Abstract

We report the results of observations of a WZ Sge-type dwarf nova ASASSN-14cv, acquired in 2014 and covering the end of a superoutburst and a rebrightening stage. We detected 8 rebrightenings of this star. Based on the light curve profiles of the rebrightenings, we conclude on the existence of both the “inside-out” and “outside-in” outbursts. During the entire course of the rebrightening stage, a brightness variability with the mean period of P = 0.^d06042(8) was detected, which was identified as a superhump period during the stage B of the superoutburst. The character of the registered superhump evolution can be either described by a parabolic approximation with the negative P_dot = −1.1 × 10⁻⁵, or by an approximation with 2 linear areas with the corresponding periods of 0.^d06074(3) and 0.^d06046(9).