论文标题
恐惧巨人的阴影：关于双星星的居住区域中的世俗扰动
Fear the Shadows of the Giants: On Secular Perturbations in Circumstellar Habitable Zones of Double Stars
论文作者
论文摘要
在发现二进制和多个星系中的极性行星之后，就其动态和可居住性引起了问题。在这项研究中，我们研究了宽二元恒星的五维参数空间，其巨大的行星超出了宜居区（Hz）。我们的目的是揭示那些将主要恒星Hz中的物体暴露于世俗扰动的轨道和物理参数组合。在建立的半分析模型的基础上，我们将两个单独的分析模型组合为一个新的分析模型，以治疗受限制的四体问题。我们将这种新的组合分析模型（CAM）应用于不同的合成系统，并系统地绘制了世俗共振（SR）的发生。然后将这些图视为参数空间的二维部分。相对于数值参考模拟，CAM模型的中值误差低于3％。我们还得出了一个简化的凸轮，该凸轮对于在身体之间具有中等至大分离的分层系统表现良好。我们的结果表明，如果（i）（i）行星的距离大于木星的距离，或者（ii）它的质量是土星或更低的。恒星蝇或银河系潮汐的偏心率的变化会将以前动态安静的HZ推向高含量状态。基于这些结果，我们提供了易于使用的在线工具“ Shados”，该工具可评估给定用户输入的CAM，并以二维参数空间图的sr在HZ中的位置进行追踪。
After the detection of extrasolar planets in binary and multiple star systems questions arose about their dynamics and habitability. In this study we investigate a five-dimensional parameter space for wide binary stars with a massive planet beyond the habitable zone (HZ). Our aim is to reveal those orbital and physical parameter combinations that expose bodies in the primary star's HZ to secular perturbations. Building upon an established semi-analytical model, we combine two separate analytical models into a new one to treat the restricted four-body problem. We apply this new Combined Analytical Model (CAM) to different synthetic systems and systematically map the occurrence of secular resonances (SR). These maps are then visualized as two-dimensional sections of the parameter space. The CAM model has a median error below 3% relative to numerical reference simulations. We also derive a simplified CAM that performs well for hierarchical systems with moderate to large separations between the bodies. Our results show that SR appear in the HZ even for large secondary star distances (up to >1000 au) if either (i) the planet's distance is larger than Jupiter's, or (ii) its mass is about Saturn's or lower. Changes in the secondary star's eccentricity by stellar flybys or galactic tides can push a formerly dynamically quiet HZ to a high-eccentricity state. Based on these results we provide the easy-to-use online tool "SHaDoS" that evaluates the CAM for a given user input and traces the locations of SR in the HZ in two-dimensional parameter space plots.
