论文标题
二进制系统中流出碰撞的动态效应
Dynamical Effects of Colliding Outflows in Binary Systems
论文作者
论文摘要
在流体中传播的物体的流出可以通过形成向前的弓形冲击来塑造流体形态，从而通过重力反馈加速物体。这种动态效应，即“动态抗摩擦”，已经在理想化的无限均匀介质中进行了研究，由于引力的远距离性质，它遭受了收敛问题的困扰。在这项工作中，我们进行了全局3D流体动力模拟，以在二元系统的情况下研究这种效果，在二元系统的情况下，这两颗恒星的流出碰撞都会产生合适的配置。我们通过模拟证明，稠密和缓慢的流出会导致二元上的正扭矩，并导致轨道的扩展。作为应用程序，我们表明，除了质量损失的贡献外，还可以在AGB阶段体验由AGB恒星和流出的Pulsar组成的二进制物。我们还证明，在二进制场景中，重力从群众中心降低为$ O（r^{ - 3}）$，这可以确保快速收敛整体效果。
The outflow of an object traveling in a fluid can shape the fluid morphology by forming a forward bow shock which accelerates the object via gravitational feedback. This dynamical effect, namely "dynamical anti-friction", has been studied in idealized infinite uniform media, which suffers from the convergence problem due to the long-range nature of gravitation. In this work, we conduct global 3D hydrodynamic simulations to study this effect in the scenario of a binary system, where the collision of outflows from both stars creates a suitable configuration. We demonstrate with simulations that a dense and slow outflow can give rise to a positive torque on the binary and lead to the expansion of the orbit. As an application, we show that binaries consisting of an AGB star and an outflowing pulsar can experience $\sim 10~\%$ orbit expansion during the AGB stage, in addition to the contribution from mass-loss. We also prove that the gravitational force drops as $O(r^{-3})$ from the center of mass in the binary scenarios, which guarantees a quick converge of the overall effect.
