论文标题
磁盘驱动的共振作为近距离行星高倾斜的起源
A disk-driven resonance as the origin of high inclinations of close-in planets
论文作者
论文摘要
最新的传播关闭行星的表征揭示了相对于其宿主恒星的赤道，具有高度倾斜甚至极性轨道的亚河内人群。对这些近距离行星起源的任何可行理论都必须解释（1）观察到的恒星斜率，（2）实质性的偏心率，以及（3）存在具有较大相互倾向的Jovian同伴。在这项工作中，我们提出了一个理论模型，该模型可以满足这些要求，而不会引起潮汐耗散或大型原始倾向。取而代之的是，在行星形成的晚期阶段，原动性磁盘扩散促进了倾斜，从而启动了共鸣的震撼和参数不稳定性的过程。该机制包括两个步骤。首先，淋巴结的世俗共振激发了对大值的倾向。然后，一旦倾斜度达到临界值，就会触发线性偏心稳定性，从而使共振并结束倾斜度的生长。一般相对论的进动将批判性倾向推向了高价值，使极地轨道固有地成为牛顿后的结果。我们的模型预测，极性的近距离近距离与低恒星倾斜轨道上的冷木星共存。
The recent characterization of transiting close-in planets has revealed an intriguing population of sub-Neptunes with highly tilted and even polar orbits relative to their host star's equator. Any viable theory for the origin of these close-in, polar planets must explain (1) the observed stellar obliquities, (2) the substantial eccentricities, and (3) the existence of Jovian companions with large mutual inclinations. In this work, we propose a theoretical model that satisfies these requirements without invoking tidal dissipation or large primordial inclinations. Instead, tilting is facilitated by the protoplanetary disk dispersal during the late stage of planet formation, initiating a process of resonance sweeping and parametric instability. This mechanism consists of two steps. First, a nodal secular resonance excites the inclination to large values; then, once the inclination reaches a critical value, a linear eccentric instability is triggered, which detunes the resonance and ends inclination growth. The critical inclination is pushed to high values by general relativistic precession, making polar orbits an inherently post-Newtonian outcome. Our model predicts that polar, close-in sub-Neptunes coexist with cold Jupiters in low stellar obliquity orbits.
