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Our result shows that the orbital period of WZ Sge is decreasing at a rate of $\\dot{P}=-2.72(\\pm0.23)\\times{10^{-13}}\\,s s^{-1}$. This secular decrease, coupled with previous detection of its donor, suggest that WZ Sge is a pre-bounce system. Further analysis indicates that the observed period decrease rate is about $1.53$ times higher than pure gravitational radiation (GR) driving. 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Zhu, S.-B. Qian, Z.-T. Han","submitted_at":"2017-05-09T03:04:31Z","abstract_excerpt":"We present the photometric results of the eclipsing cataclysmic variable (CV) WZ Sge near the period minimum ($P_{min}$). Eight new mid-eclipse times were determined and the orbital ephemeris was updated. Our result shows that the orbital period of WZ Sge is decreasing at a rate of $\\dot{P}=-2.72(\\pm0.23)\\times{10^{-13}}\\,s s^{-1}$. This secular decrease, coupled with previous detection of its donor, suggest that WZ Sge is a pre-bounce system. Further analysis indicates that the observed period decrease rate is about $1.53$ times higher than pure gravitational radiation (GR) driving. 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