论文标题
令人兴奋
Exciting the TTV Phases of Resonant Sub-Neptunes
论文作者
论文摘要
诸如3：2和2：1之类的时期的宽度范围较大，并且相应的缺陷范围狭窄。任何解释此期比结构的理论也必须解释在共振附近观察到的强透出时间变化（TTV）。除了振幅和一个周期外，正弦TTV具有相位。通常被忽略的TTV阶段是有效的集成常数，编码有关初始条件或环境的信息。共振附近的许多TTV表现出非零阶段。该观察结果令人惊讶，因为捕获行星共振的耗散过程也将TTV阶段降至零。我们展示了如果成对的亚纽群对在气盘中捕获共鸣，同时伴随着第三个偏心的非谐振体，则如何再现了周期比结构和非零TTV阶段。圆盘的收敛迁移和偏心率驱动驱动的轨道周期比的可相当性宽。然后，光盘清除后，第三体相强迫的世俗强迫将TTVS强迫。该方案预测，共振的行星在Apside上排列，并且具有比以前想象的要大的偏心率。
There are excesses of sub-Neptunes just wide of period commensurabilities like the 3:2 and 2:1, and corresponding deficits narrow of them. Any theory that explains this period ratio structure must also explain the strong transit timing variations (TTVs) observed near resonance. Besides an amplitude and a period, a sinusoidal TTV has a phase. Often overlooked, TTV phases are effectively integration constants, encoding information about initial conditions or the environment. Many TTVs near resonance exhibit non-zero phases. This observation is surprising because dissipative processes that capture planets into resonance also damp TTV phases to zero. We show how both the period ratio structure and the non-zero TTV phases can be reproduced if pairs of sub-Neptunes capture into resonance in a gas disc while accompanied by a third eccentric non-resonant body. Convergent migration and eccentricity damping by the disc drives pairs to orbital period ratios wide of commensurability; then, after the disc clears, secular forcing by the third body phase-shifts the TTVs. The scenario predicts that resonant planets are apsidally aligned and possess eccentricities up to an order of magnitude larger than previously thought.
