Resonant Structure in the Kuiper Disk: An Asymmetric Plutino Disk
Resonant Structure in the Kuiper Disk: An Asymmetric Plutino Disk
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柯伊伯盘中的共振结构：不对称的冥王星盘
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
K. Grogan
中科院分区：
文献类型：
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作者：
E. K. Holmes;S. Dermott;B. Gustafson;K. Grogan
为了开发一个动力学模型的柯伊伯盘，我们运行数值积分的粒子源体被困在3：2外部平均运动共振与海王星，以确定有多少百分比的粒子留在共振的各种粒子和源体的大小。粒子的动力学演化遵循从源到汇的Poynting-Robertson光阻力，太阳风阻力，辐射压力，洛伦兹力，中性星际气体阻力，包括行星引力摄动的影响。我们发现3：2共振中的粒子数随着β的减小而增加（即，对于初始源体较小（直径≤10 km）的情况，以及只要粒子的电势较小（≤ 1.5 V），或者中性星际气体阻力的影响，洛伦兹力的增加不会显著改变共振粒子的百分比，则粒子尺寸增加）。整个柯伊伯盘的亮度是使用由500 μm直径的粒子组成的模型计算的，并且与柯伊伯盘亮度的上限和先前的估计非常吻合。一个圆盘的大小-频率分布偏向大粒子，大粒子更可能保持共振，它可能比一个由小粒子组成的圆盘具有更强、更容易识别的共振特征。
In order to develop a dynamical model of the Kuiper disk, we run numerical integrations of particles originating from source bodies trapped in the 3 : 2 external mean motion resonance with Neptune to determine what percentage of particles remain in the resonance for a variety of particle and source body sizes. The dynamical evolution of the particles is followed from source to sink with Poynting-Robertson light drag, solar wind drag, radiation pressure, the Lorentz force, neutral interstellar gas drag, and the effects of planetary gravitational perturbations included. We find that the number of particles in the 3 : 2 resonance increases with decreasing β (i.e., increasing particle size) for the cases in which the initial source bodies are small (≤10 km in diameter) and that the percentage of particles in resonance is not significantly changed by either the addition of the Lorentz force, as long as the potential of the particles is small (≈5 V), or the effect of neutral interstellar gas drag. The brightness of the entire Kuiper disk is calculated using a model composed of 500 μm diameter particles and fits well with upper limits to the Kuiper disk brightness and previous estimates. A disk with a size-frequency distribution weighted toward large particles, which are more likely to remain in resonance, may have a stronger, more easily identifiable resonant signature than a disk composed of small particles.