摘要：We report 18 new primary minima timing observations of the short-period eclipsing binary system NY Virginis.We combined these minima with previously published primary minima to update circumbinary exoplanet models in this system based on O−C timing variations. We performed a nonlinear least-squares minimization search using a quadratic ephemeris and either one or two exoplanets. The only model with an acceptable fit includes a period derivative P 2.83 1012= ´-˙ and two planets in eccentric orbits e=0.15, 0.15 with minimum masses of 2.7 and 5.5 Jovian masses. Analysis of the orbit stability shows that this solution is stable for at least 10 8 years, but a small increase in eccentricity (e 0.20) for either planet renders the orbits unstable in less than 10 6 years. A number of model parameters are significantly degenerate, so additional observations are required to determine planetary parameters with high statistical confidence.
