Jupiter’s decisive role in the inner Solar System’s early evolution
Jupiter’s decisive role in the inner Solar System’s early evolution
复制标题
木星在内太阳系早期演化中的决定性作用
DOI：
10.1073/pnas.1423252112
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
G. Laughlin
中科院分区：
文献类型：
--
作者：
K. Batygin;G. Laughlin
意义太阳系是银河系行星普查中一个不同寻常的成员，因为它缺少居住在离太阳很近的行星。在这项工作中，我们提出了原始星云驱动的过程，负责将木星和土星保留在大轨道半径上，并雕刻火星的低质量，也负责清理太阳系最里面的区域。总体而言，我们的结果将太阳系和塑造其独特轨道结构的机制置于更广泛的太阳系外背景中。太阳系外行星系统的统计数据表明，默认的行星形成模式产生的行星轨道周期短于100天，质量大大超过地球的质量。从这个角度来看，太阳系是不寻常的。在这里，我们提供的模拟表明，木星和土星的一个流行的形成场景，在扭转方向之前，木星从a>；5天文单位(AU)向内迁移到≈1.5AU，可以解释太阳系陆地行星的总质量很低，以及没有<；0.4AU的行星。木星的内迁将S≳10−100公里的小行星带入低阶平均运动共振，引导和激发它们的轨道。由此产生的碰撞级联产生了一个行星小圆盘，它在气体阻力下演化，将任何先前存在的短周期行星都推入太阳。在这种情况下，太阳系的类地行星是由气体匮乏、质量耗尽的碎片形成的，这些碎片在动力演化的主要阶段后仍然存在。
Significance The Solar System is an unusual member of the galactic planetary census in that it lacks planets that reside in close proximity to the Sun. In this work, we propose that the primordial nebula-driven process responsible for retention of Jupiter and Saturn at large orbital radii and sculpting Mars’ low mass is also responsible for clearing out the Solar System’s innermost region. Cumulatively, our results place the Solar System and the mechanisms that shaped its unique orbital architecture into a broader, extrasolar context. The statistics of extrasolar planetary systems indicate that the default mode of planet formation generates planets with orbital periods shorter than 100 days and masses substantially exceeding that of the Earth. When viewed in this context, the Solar System is unusual. Here, we present simulations which show that a popular formation scenario for Jupiter and Saturn, in which Jupiter migrates inward from a > 5 astronomical units (AU) to a ≈ 1.5 AU before reversing direction, can explain the low overall mass of the Solar System’s terrestrial planets, as well as the absence of planets with a < 0.4 AU. Jupiter’s inward migration entrained s ≳ 10−100 km planetesimals into low-order mean motion resonances, shepherding and exciting their orbits. The resulting collisional cascade generated a planetesimal disk that, evolving under gas drag, would have driven any preexisting short-period planets into the Sun. In this scenario, the Solar System’s terrestrial planets formed from gas-starved mass-depleted debris that remained after the primary period of dynamical evolution.
DOI：
10.1146/annurev-astro-081811-125523
发表时间：
2012-03
影响因子：
33.3
作者：
W. Kley;R. Nelson
通讯作者：
W. Kley;R. Nelson
灾难性小天体碰撞的全面数值模拟
影响因子：
3.2
作者：
Leinhardt Z
通讯作者：
Leinhardt Z