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基于FARGO3D的行星与原行星盘相互作用的模拟

Simulation of the Interaction between Planet and Protoplanetary Disk Based on FARGO3D

  • 摘要: 自从行星科学发展以来, 已经发现了5000多颗系外行星. 理解原行星盘的演化对明确系外行星的分类, 提高系外行星的探测效率至关重要. 同时, 系外行星的观测样本能够用来约束原行星盘与行星相互作用中的物理参数并检验已有模型的正确性. 因此, 将原行星盘的表面密度与恒星质量建立联系, 结合系外行星性质的分布, 利用流体动力学代码FARGO3D模拟了不同质量的行星与特定的原行星盘之间的相互作用过程. 模拟结果表明: (1)沟结构的相对面密度与行星质量存在幂律关系, 且幂律指数与恒星质量存在较强相关性; (2)沟结构的持续时间与行星质量存在幂律关系, 且幂律指数与恒星质量存在较弱相关性; (3)沟结构的宽度与行星质量存在对数线性关系, 且幂律指数与恒星质量存在较弱相关性. 即行星与原行星盘的相互作用的强弱不但体现在稳定状态的沟结构的相对面密度, 还体现在沟结构的持续时间以及沟结构的宽度.

     

    Abstract: Since the development of planetary science, more than 5000 exoplanets have been discovered. Understanding the evolution of protoplanetary disks is essential to clarify the classification of exoplanets and improve the efficiency of exoplanet detection. At the same time, exoplanet observations can be used to constrain and examine the physical parameters of the interaction between the protoplanetary disk and the planet. Therefore, in this paper, the surface density of the protoplanetary disk is linked to the star mass, combined with the distribution of exoplanet properties, and the interaction process between planets with different masses and specific protoplanetary disks is simulated by using the fluid dynamics code FARGO3D. Simulation results show that: (1) there is a power-law relationship between the relative surface density of the gap structure and the mass of the planet, and the power-law exponent has a strong correlation with the mass of the star; (2) there is a power-law relationship between the duration of the gap structure and the mass of the planet, and the power-law exponent has a weak correlation with the mass of the star; (3) there is a log-linear relationship between the width of the gap structure and the mass of the planet, and the power-law exponent has a weak correlation with the mass of the star. That is, the strength of the interaction between the planet and the protoplanetary disk is not only reflected in the relative surface density of the gap structure in the stable state, but also in the duration and width of the gap structure.

     

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