论文标题
在存在恒星飞行的弱扰动的情况下，太阳系的长期稳定性
On the long-term stability of the Solar System in the presence of weak perturbations from stellar flybys
论文作者
论文摘要
行星系统的结构和演变部分由恒星Flybys塑造。在这种情况下，我们研究了恒星的相遇，这些相遇太弱，无法立即破坏行星系统，但仍然足够强大，可以衡量系统的动态状态。我们使用简单的分析模型估算了这种扰动在世俗发展系统上的强度，并通过直接N体模拟确认了这些估计值。然后，我们运行长期整合，并表明即使是恒星飞圈的小扰动也会影响行星系统一生的稳定性。我们发现，对外行星轨道的小扰动是在行星之间传递的，从而增加了内部行星系统不稳定的可能性。具体而言，我们对太阳系的结果表明，对Neptune的半束轴的相对扰动为0.1％，足以使5 Gyrs在5 Gyrs中不稳定太阳系的概率通过一个数量级。
The architecture and evolution of planetary systems are shaped in part by stellar flybys. Within this context, we look at stellar encounters which are too weak to immediately destabilize a planetary system but are nevertheless strong enough to measurably perturb the system's dynamical state. We estimate the strength of such perturbations on secularly evolving systems using a simple analytic model and confirm those estimates with direct N-body simulations. We then run long-term integrations and show that even small perturbations from stellar flybys can influence the stability of planetary systems over their lifetime. We find that small perturbations to the outer planets' orbits are transferred between planets, increasing the likelihood that the inner planetary system will destabilize. Specifically, our results for the Solar System show that relative perturbations to Neptune's semi-major axis of order 0.1% are strong enough to increase the probability of destabilizing the Solar System within 5 Gyrs by one order of magnitude.
