Abstract
We present high-speed K-band photometry of WZ Sge obtained 2 yr before the recent 2001 superoutburst. Our data show the first ever detection of a disc eclipse in WZ Sge during quiescence. Analysis of the ingress and egress times of the disc and bright spot gives constraints on the system parameters of M1 = 0.740 ± 0.071 M � , M2 = 0.0445 ± 0.0027 M � and i = 75. ◦ 89 ± 0. 32. Oscillations at 27.88 s ± 0.01 s and 28.61 s ± 0.01 s are present in the infrared light curve. We determine the infrared oscillation parameters and discuss the source of the oscillations. We analyse the long-term brightness variation in the K-band light curves and find no evidence for a precessing, elliptical accretion disc in quiescence.
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