Vega碎片盘的结构特性研究

发布时间：2019-02-19 21:59

【摘要】：Vega的碎片盘在早期的观测中出现特殊结构,这可能是其内部存在潜在的高偏心率行星导致的.但是,近期对Vega的多波段高分辨率观测显示,Vega的碎片盘是一个平滑的盘结构,这虽然不能否定其内部存在行星的假说,但是对其中潜在行星的某些轨道参数提供了限制条件.使用数值模拟的方法对Vega系统的碎片盘和可能存在的行星进行模拟.模拟中碎片盘位于80～120 AU.盘中尘埃尺寸为10～100μm,轨道偏心率与倾角都非常小.通过多组计算的结果发现,如果Vega系统中不存在行星,那么其碎片盘演化结果与最新的观测结果吻合得较好;如果存在行星,且行星偏心率较大(比如e=0.6)时,那么行星的轨道半长径不能大于60 AU,否则碎片盘会在行星的影响下产生明显的聚集现象.行星与碎片盘的2:1平运动共振是导致碎片盘产生结构的主要原因.
[Abstract]:The debris disk of Vega has a special structure in the early observation, which may be caused by the existence of potentially high eccentricity planets inside it. However, recent multiband high-resolution observations of Vega show that the Vega debris disk is a smooth disk structure, which does not deny the hypothesis of the existence of planets in Vega, but it provides a limiting condition for some orbital parameters of potential planets. Numerical simulation is used to simulate the fragments and possible planets of the Vega system. The fragment disk in the simulation is located at 80U 120 AU. The size of dust in disk is 10 ~ 100 渭 m, and the eccentricity and inclination of track are very small. It is found that if there are no planets in the Vega system, the results of debris disk evolution are in good agreement with the latest observations. If there is a planet and the eccentricity of the planet is high (E. g., e0. 6), then the half length diameter of the orbit of the planet cannot be greater than 60 AU, otherwise the debris disk will produce obvious aggregation phenomenon under the influence of the planet. The 2:1 flat motion resonance between the planet and the debris disk is the main reason for the formation of the structure of the fragment disk.
【作者单位】：中国科学院紫金山天文台;中国科学院大学;
【基金】：国家自然科学基金项目(10973044,10833001,11273068) 江苏省自然科学基金项目(BK2009341) 中国科学院新兴与交叉学科布局试点项目(KJZD-EW-Z001) 紫金山天文台小行星基金会资助
【分类号】：P136.1

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