错位三星系统中的环双星轨道稳定性
Stability of circumbinary orbits in misaligned triple star systems
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中文总结 AI 辅助
该研究探究错位三星系统中环双星轨道的稳定性，通过长期理论结合n体模拟得出相关判据，为多星系统中环双星行星的形成与探测提供依据。
中文摘要 AI 辅助
我们研究等级三星系统中环双星轨道的稳定性，重点关注错位的外部伴星的影响。测试粒子受到来自内部双星和外部双星伴星的相互竞争的引力力矩作用。我们用长期理论估计粒子稳定的外部半径，此时力矩达到平衡。我们发现，在广泛的三星系统构型中，该结果与n体模拟吻合良好。即使在严重错位的三星系统中，也存在稳定的环双星轨道。相对于内部双星的极轨道和高度倾斜轨道可在相当大的径向范围内保持稳定，且该范围对三星系统的错位不敏感。当双星之间的相互倾角很大时，与内部双星接近共面或逆行共面的轨道更易出现不稳定。这些发现表明，在广泛的条件下，错位的和极性的环双星盘与行星可在三星系统中存续。该分析判据确定了稳定物质可能存在的区域，对多星系统中环双星行星的形成与探测具有重要意义。
英文摘要
We investigate the stability of circumbinary orbits in hierarchical triple star systems, focusing on the effects of a misaligned outer companion star. Test particles are subject to competing gravitational torques from the inner binary and the outer binary companion. With secular theory we estimate the outer radius of particle stability, where the torques balance. We find good agreement with $n$-body simulations across a wide range of triple star configurations. Stable circumbinary orbits can exist even in strongly misaligned triples. Polar and highly inclined orbits with respect to the inner binary can remain stable over a substantial radial range, which is insensitive to the triple star misalignment. Orbits that are close to coplanar or retrograde coplanar to the inner binary are more susceptible to instability when the mutual inclination between the binaries is large. These findings indicate that misaligned and polar circumbinary disks and planets can survive in triple star systems under a broad set of conditions. The analytic criterion identifies where stable material may exist, with implications for the formation and detection of circumbinary planets in multiple-star systems.
