在盘中被抓住：通过AGN拖动伴星
In the grip of the disk: dragging the companion through an AGN
AI总结：
研究探讨了AGN盘中捕获的双星系统在接近合并前的演化，发现重复相互作用会减小轨道倾角和半长轴，而偏心率呈现复杂变化，最终系统趋于圆化，且某些高偏心率轨道可快速转为同步旋转。
摘要：
活动星系核（AGN）被提出作为可能促成极端质量比双星捕获并加速其并合的环境，其并合速率超过引力波辐射预期。本文研究了双星刚被捕获后的演化，聚焦于系统远离并合时的双星参数变化。发现重复与AGN盘的相互作用通常会降低轨道倾角和半长轴。偏心率的演化更为复杂，表现出增长和衰减的阶段。然而，随着双星逐渐与盘平面对齐，系统趋于圆化。有趣的是，我们还发现初始高偏心率、近反向旋转的轨道可快速转为同步旋转，同时保持偏心率恒定。这些动力学效应可能对LISA源的建模和解释有重大影响。
英文摘要：
Active galactic nuclei (AGN) have been proposed as environments that can facilitate the capture of extreme-mass-ratio binaries and accelerate their inspiral beyond the rate expected from gravitational wave emission alone. In this work, we explore binaries shortly after capture, focusing on the evolution of the binary parameters when the system is still far from merger. We find that repeated interactions with the AGN disk typically reduce both the inclination and semi-major axis of the orbit. The evolution of the eccentricity is more intricate, exhibiting phases of growth and decay. Nevertheless, as the binary gradually aligns with the disk plane, the system tends to circularize. Interestingly, we also identify scenarios where initially highly eccentric, nearly counter-rotating orbits can undergo a rapid transition to co-rotation while maintaining a constant eccentricity. These dynamical effects could have significant implications for the modeling and interpretation of LISA sources.
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