A numerical simulation of a 'Super-Earth' core delivery from ~100 to ~8 au
A numerical simulation of a 'Super-Earth' core delivery from ~100 to ~8 au
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“超级地球”核心输送从约 100 个天文单位到约 8 个天文单位的数值模拟
DOI：
10.1111/j.1365-2966.2011.18953.x
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
S. Nayakshin
中科院分区：
文献类型：
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作者：
Seung;S. Nayakshin
我们使用平滑粒子流体动力学模拟与近似的辐射冷却处方的大规模（100 Au）非常年轻的原行星盘的演变模型。我们还模拟尘埃生长和气体颗粒动力学与第二流体的方法。结果发现，盘碎片成大量的10兆焦耳的团块，冷却和收缩缓慢。有些团块演化到偏心轨道上，将它们送入Au的内十，在那里它们被来自星星的潮汐力破坏。尘埃在团块内部生长和沉积，显示出非常强烈的分离，最大的颗粒在中心形成致密的核心。在某些情况下，尘核的密度超过了气体的密度，并且只受到数值约束的限制，这表明这些核心应该坍塌成岩石行星核心。其中一颗巨行星的胚胎向内迁移，足够靠近，在大约10 Au时被破坏，留下一个大约7.5 M质量的固体核心，在一个半径为108 Au的低离心率轨道上。这些模拟支持了最近的建议，即类地行星和巨行星可能是潮汐破坏的巨行星胚胎的残余物。
We use smoothed particle hydrodynamics simulations with an approximate radiative cooling prescription to model the evolution of a massive (∼100 au) very young protoplanetary disc. We also model dust growth and gas-grain dynamics with a second fluid approach. It is found that the disc fragments into a large number of ∼10MJ clumps that cool and contract slowly. Some of the clumps evolve on to eccentric orbits, delivering them into the inner tens of au, where they are disrupted by tidal forces from the star. Dust grows and sediments inside the clumps, displaying a very strong segregation, with the largest particles forming dense cores in the centres. The density of the dust cores in some cases exceeds that of the gas and is limited only by the numerical constraints, indicating that these cores should collapse into rocky planetary cores. One particular giant planet embryo migrates inwards close enough to be disrupted at about 10 au, leaving a self-bound solid core of about 7.5 M⊕ mass on a low-eccentricity orbit at a radius of ∼8 au. These simulations support the recent suggestions that terrestrial and giant planets may be the remnants of tidally disrupted giant planet embryos.