脉动sdB +M双星系统NY Virginis及其环双星
The Pulsating sdB+M Eclipsing System NY Virginis and its Circumbinary Planets
摘要：
我们搜索了在历史日食时间内围绕纽约维尔运行的环双星行星，包括我们的长期CCD数据。68次最小光精度优于10秒用于星历计算。与这些时间的最佳拟合表明，由于周期分别为$P_3$ =8.2年和$P_4$ =27.0年以及半振幅分别为$K_3$ =6.9秒和$K_4$ =27.3秒的两个正弦曲线的组合，NY Vir的轨道周期发生了变化。这种周期性的变化很可能是由一对光-时间效应引起的，这是由于存在第三和第四个天体，它们被引力束缚在食对上。我们导出了这两个天体的轨道参数和最小质量，$M_3 \sin i_3$ = 2.8 M $\rm_{Jup}$和$M_4 \sin i_4$ = 4.5 M $\rm_{Jup}$。动力学分析表明，外层伴星不太可能在圆形轨道上围绕双星运行。相反，我们表明未来的定时数据可能会将其偏心率推至中等值，使系统表现出长期稳定性。结果表明，NY Vir可能是一个星-行星系统，它由一颗非常接近的双星和两颗巨行星组成。周期比$P_{3}/P_{4}$表明，它们之间的长期引力相互作用将导致捕获到近3：10的平均运动共振。当环联星行星的存在得到更全面的证实和认识时，对该行星系统的形成和演化将有很大的推动作用。
英文摘要：
We searched for circumbinary planets orbiting NY Vir in historical eclipse times including our long-term CCD data. Sixty-eight times of minimum light with accuracies better than 10 s were used for the ephemeris computations. The best fit to those timings indicated that the orbital period of NY Vir has varied due to a combination of two sinusoids with periods of $P_3$=8.2 yr and $P_4$=27.0 yr and semi-amplitudes of $K_3$=6.9 s and $K_4$=27.3 s, respectively. The periodic variations most likely arise from a pair of light-time effects due to the presence of third and fourth bodies that are gravitationally bound to the eclipsing pair. We have derived the orbital parameters and the minimum masses, $M_3 \sin i_3$ = 2.8 M$\rm_{Jup}$ and $M_4 \sin i_4$ = 4.5 M$\rm_{Jup}$, of both objects. A dynamical analysis suggests that the outer companion is less likely to orbit the binary on a circular orbit. Instead we show that future timing data might push its eccentricity to moderate values for which the system exhibits long-term stability. The results demonstrate that NY Vir is probably a star-planet system, which consists of a very close binary star and two giant planets. The period ratio $P_{3}/P_{4}$ suggests that a long-term gravitational interaction between them would result in capture into a nearly 3:10 mean motion resonance. When the presence of the circumbinary planets is verified and understood more comprehensively, the formation and evolution of this planetary system should be advanced greatly.
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