2003年El61碰撞族的散射盘起源--碰撞对小天体动力学的重要性的一个例子
On a Scattered-Disk Origin for the 2003 El61 Collisional Family - an Example of the Importance of Collisions on the Dynamics of Small Bodies
摘要：
最近在柯伊伯带发现的2003 EL 61碰撞族（Brown等人，2007年）是令人惊讶的，因为这样一个家庭的形成是一个非常不可能的事件在今天的带。假设Brown et al.的估计的祖先的大小，我们发现，柯伊伯带的对象参与这样的碰撞，因为原始时代的概率是小于约0.001。此外，碰撞不可能发生在大质量的原始柯伊伯带中，因为无论发生什么事件，该家族的动力学相干性都不会幸存下来。在这里，我们建议家庭是两个分散的磁盘对象之间的碰撞的结果。我们表明，两个这样的物体之间发生碰撞的概率与布朗等人（2007）所主张的大小相似，并且由此产生的家庭的质心在柯伊伯带的典型轨道上可以高达47%。考虑到这一估计中涉及的很大的不确定性，这一结果与存在一个这样的家庭是一致的。如果这是真的，这个结果的意义远远超出了单个碰撞家族的起源，因为它表明碰撞在塑造我们今天看到的小天体种群的动力学结构方面发挥了重要作用。
英文摘要：
The recent discovery of the 2003EL61 collisional family in the Kuiper belt (Brown et al., 2007) is surprising because the formation of such a family is a highly improbable event in today's belt. Assuming Brown et al.'s estimate of the size of progenitors, we find that the probability that a Kuiper belt object was involved in such a collision since primordial times is less than roughly 0.001. In addition, it is not possible for the collision to have occurred in a massive primordial Kuiper belt because the dynamical coherence of the family would not have survived whatever event produced the currently observed orbital excitation. Here we suggest that the family is the result of a collision between two scattered disk objects. We show that the probability that a collision occurred between two such objects with sizes similar to those advocated in Brown et al. (2007) and that the center of mass of the resulting family is on an orbit typical of the Kuiper belt can be as large as 47%. Given the large uncertainties involved in this estimate, this result is consistent with the existence of one such family. If true, this result has implications far beyond the origin of a single collisional family, because it shows that collisions played an important role in shaping the dynamical structure of the small body populations that we see today.
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