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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Binary formation in planetesimal disks. II. Planetesimals with a mass spectrum
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Binary formation in planetesimal disks. II. Planetesimals with a mass spectrum

机译：在小行星盘中的二进制形成。二。质谱的小行星

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摘要

Many massive objects have been found in the outer region of the solar system. How they were formed and evolved has not been well understood, although there have been intensive studies of the accretion process of terrestrial planets. One of the mysteries is the existence of binary planetesimals with near-equal mass components and highly eccentric orbits. These binary planetesimals are quite different from the satellites observed in the asteroid belt region. The ratio of the Hill radius to the physical radius of the planetesimals is much larger for the outer region of the disk, compared to the inner region of the disk. The Hill radius increases with the semimajor axis. Therefore, planetesimals in the outer region can form close and eccentric binaries, while those in the inner region would simply collide. In this paper, we carried out N-body simulations in different regions of the disk and studied whether binaries form in the outer region of the disk. We found that large planetesimals tend to form binaries. A significant fraction of large planetesimals are components of binaries. Planetesimals that become the components of binaries eventually collide with a third body, through three-body encounters. Thus, the existence of binaries can enhance the growth rate of planetesimals in the trans-Neptunian object region.
机译：在太阳系的外围发现了许多巨大的物体。尽管已经对陆地行星的吸积过程进行了深入研究，但人们对它们的形成和演化方式还没有很好的了解。谜团之一是存在具有近似相等质量分量和高度偏心轨道的二元天体。这些双星小行星与在小行星带区域观测到的卫星完全不同。与圆盘的内部区域相比，圆盘的外部区域的希尔半径与小行星物理半径的比率要大得多。希尔半径随半长轴而增加。因此，外部区域中的小行星可以形成紧密而偏心的二进制文件，而内部区域中的小行星则会简单地发生碰撞。在本文中，我们在磁盘的不同区域进行了N体模拟，并研究了二进制文件是否在磁盘的外部区域形成。我们发现大的小行星倾向于形成二进制。很大的小行星是二进制的组成部分。通过三体相遇，成为二元组成部分的小行星最终与第三体碰撞。因此，二进制文件的存在可以提高跨海王星物体区域中小行星的生长速度。

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