Terrestrial planet formation under migration: systems near the 4:2:1 mean motion resonance
Terrestrial planet formation under migration: systems near the 4:2:1 mean motion resonance
复制标题
迁移中的类地行星形成：接近 4:2:1 平均运动共振的系统
DOI：
10.1093/mnras/stx082
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发表时间：
2017
影响因子：
4.8
通讯作者：
Jin Sheng
中科院分区：
文献类型：
--
作者：
Sun Zhao;Ji Jianghui;Wang Su;Jin Sheng
在这项工作中，我们通过执行两组 N 体模拟来广泛研究近 4:2:1 平均运动共振 (MMR) 配置的形成。我们在第一组中模拟了微星、行星胚胎和巨行星的偏心阻尼、气体阻力、I 型和 II 型行星迁移。对于具有 II 型迁移的巨行星的模拟，这些系统中可能会产生质量高达几个地球质量的大质量类地行星。我们进一步表明，通过木星行星 II 型迁移的引导和/或分散机制，系统中的类地行星和巨行星可以演变成接近 4:2:1 的 MMR。此外，该模型适用于Kepler-238和302系统的形成。在第二组模拟中，我们研究了类地行星系统中 4:2:1 MMR 的形成，其中行星经历 I 型迁移和偏心率阻尼。通过考虑 I 型迁移，类似于 17.1% 的模拟表明类地行星演化为 4:2:1 MMR。然而，这个概率应该取决于行星的初始条件。因此，我们得出结论，I 型和 II 型迁移都可以在近地行星的形成中发挥至关重要的作用。
In this work, we investigate extensively the formation of near 4:2:1 mean motion resonance (MMR) configurations by performing two sets of N-body simulations. We model the eccentricity damping, gas drag, type I and type II planetary migration of planetesimals, planetary embryos and giant planets in the first set. For simulations of giant planets with type II migration, massive terrestrial planets with a mass up to several Earth masses are likely produced in these systems. We further show that by shepherding and/ or scattering mechanisms through a Jovian planet's type II migration, the terrestrial and giant planets in the systems can be evolved into near 4:2:1 MMRs. Moreover, the models are applicable to the formation of the Kepler-238 and 302 systems. In the second set of simulations, we study 4:2:1 MMR formation in terrestrial planetary systems, where the planets undergo type I migration and eccentricity damping. By considering type I migration, similar to 17.1 per cent of the simulations indicate that terrestrial planets are evolved into 4:2:1 MMRs. However, this probability should depend on the initial conditions of the planets. Hence, we conclude that both type I and type II migration can play a crucial role in close-in terrestrial planet formation.