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arXiv 1104.4967astro-ph.EP
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经典柯伊伯带的倾斜混合

Inclination Mixing in the Classical Kuiper Belt

Kathryn Volk, Renu Malhotra

摘要:

我们调查的长期演化的倾斜已知的经典和共振柯伊伯带天体(KBO)。这部分是由观察到的双峰倾斜分布和低和高倾斜人口之间的假定的物理差异的动机。我们发现,一些经典的KBO在十亿年的时间尺度上经历了很大的倾斜变化,这意味着当前的低倾斜人口的成员可能已经在过去的高倾斜人口,反之亦然。的动力学机制负责的时间变化的倾斜主要是遥远的遭遇海王星和混乱的扩散边界附近的平均运动共振。我们重新评估倾角和物理性质之间的相关性,包括倾角随时间的变化。我们发现,尺寸倾斜度和颜色倾斜度的相关性是统计上不太显着比以前报道的(主要是由于增加的数据集的大小,因为以前的作品与倾斜度的变化有一定的贡献)。倾斜度的时变性并没有改变先前的发现,即二元经典KBO的倾斜度低于非二元物体。我们在经典柯伊伯带区域的共振对象的研究包括在3:2,7:4,2:1,和八个高阶平均运动共振的对象。我们发现,这些对象(其中一些以前被归类为非共振)经历了较大的变化,在倾斜度相比,非共振人口,这表明他们目前的倾角一般不代表他们的原始倾角。它们在十亿年时间尺度上也不太稳定。

英文摘要:

We investigate the long-term evolution of the inclinations of the known classical and resonant Kuiper belt objects (KBOs). This is partially motivated by the observed bimodal inclination distribution and by the putative physical differences between the low- and high-inclination populations. We find that some classical KBOs undergo large changes in inclination over gigayear timescales, which means that a current member of the low-inclination population may have been in the high-inclination population in the past, and vice versa. The dynamical mechanisms responsible for the time-variability of inclinations are predominantly distant encounters with Neptune and chaotic diffusion near the boundaries of mean motion resonances. We reassess the correlations between inclination and physical properties including inclination time-variability. We find that the size-inclination and color-inclination correlations are less statistically significant than previously reported (mostly due to the increased size of the data set since previous works with some contribution from inclination variability). The time-variability of inclinations does not change the previous finding that binary classical KBOs have lower inclinations than non-binary objects. Our study of resonant objects in the classical Kuiper belt region includes objects in the 3:2, 7:4, 2:1, and eight higher-order mean motion resonances. We find that these objects (some of which were previously classified as non-resonant) undergo larger changes in inclination compared to the non-resonant population, indicating that their current inclinations are not generally representative of their original inclinations. They are also less stable on gigayear timescales.

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