论文标题
高融合半人马的星际起源
An interstellar origin for high-inclination Centaurs
论文作者
论文摘要
我们使用高分辨率统计搜索稳定的轨道研究了真正的高倾斜半人马和跨纽普尔对象的可能起源，当行星形成在过去的45亿年中结束时，它们会及时地回到时代。模拟是一种精确的轨道确定方法，不涉及临时初始条件或假设，例如在行星磁盘松弛模型中所依赖的磁盘放松模型中发现的假设。 It can therefore be used to independently test origin theories based on relaxation models by examining the past orbits of specific real objects. Here, we examined 17 multiple-opposition high-inclination Centaurs and the two polar trans-neptunian objects 2008 KV42 and (471325) 2011 KT19.统计分布表明它们的轨道过去几乎是极性的4.5 Gyr，并且位于散射的磁盘和内部Oort云区域。早期的极性倾向不能由当前的太阳系形成理论来解释，因为早期的行星系统必须几乎是平坦的，以解释低融合小行星和柯伊伯带。此外，据信，早期散射的磁盘和内部的Oort云区域被认为没有太阳系材料，因为地球磁盘不可能远远超过Neptune的当前轨道，以免地球的向外迁移。因此，过去的高倾斜CentAurs 4.5 Gyr的几乎极性轨道表明它们可能早期从星际培养基中捕获。
We investigate the possible origins of real high-inclination Centaurs and trans-neptunian objects using a high-resolution statistical search for stable orbits that simulates their evolution back in time to the epoch when planet formation ended 4.5 billion years in the past. The simulation is a precise orbit determination method that does not involve ad hoc initial conditions or assumptions such as those found in planetesimal disk relaxation models upon which their conclusions depend. It can therefore be used to independently test origin theories based on relaxation models by examining the past orbits of specific real objects. Here, we examined 17 multiple-opposition high-inclination Centaurs and the two polar trans-neptunian objects 2008 KV42 and (471325) 2011 KT19. The statistical distributions show that their orbits were nearly polar 4.5 Gyr in the past, and were located in the scattered disk and inner Oort cloud regions. Early polar inclinations cannot be accounted for by current Solar system formation theory as the early planetesimal system must have been nearly flat in order to explain the low-inclination asteroid and Kuiper belts. Furthermore, the early scattered disk and inner Oort cloud regions are believed to have been devoid of Solar system material as the planetesimal disk could not have extended far beyond Neptune's current orbit in order to halt the planet's outward migration. The nearly polar orbits of high-inclination Centaurs 4.5 Gyr in the past therefore indicate their probable early capture from the interstellar medium.
