行星形成数值模拟的研究现状与未来需求Ⅱ:行星迁移、核吸积以及大气逃逸

发布时间：2018-09-14 13:04

【摘要】：介绍了行星形成涉及到的几个重要阶段,如行星迁移、核吸积和大气逃逸的基本物理过程和数值模拟研究现状。行星迁移会影响行星的轨道偏心率和倾角,并改变原行星盘的结构;核吸积是决定行星演化为类地行星或者类木行星的关键因素;大气逃逸对行星的气候和演化产生重要影响。这些过程均涉及到复杂的辐射磁流体动力学过程,早期的理论研究往往采用很多人为的简化假设。随着超级计算机计算能力的提高和磁流体数值模拟算法的日渐成熟,人们已经可以对这类复杂的非线性动力学问题开展直接的数值模拟研究,克服了早期理论研究中人为假设的局限。但是,目前人们开展的研究主要基于磁流体动力学数值模拟,对辐射转移如何影响磁流体动力学过程的研究还比较欠缺。强调了进行辐射磁流体动力学数值模拟的必要性和紧迫性。针对辐射磁流体数值模拟程序的开发,从辐射转移,磁场的处理,吸积盘的自引力、三维效应、非理想效应和尘埃的效应等方面提出了相应的技术需求。介绍了本研究领域内发展辐射磁流体数值模拟的策略。
[Abstract]:Some important stages of planetary formation, such as planetary migration, nuclear accretion and atmospheric escape, are introduced in this paper. Planetary migration will affect the eccentricity and inclination of the planets and change the structure of the original planetary disk; the nuclear accretion is the key factor to determine the evolution of the planets into terrestrial planets or wood-like planets; and the escape of the atmosphere will have an important impact on the climate and evolution of the planets. These processes involve complex processes of radiative magnetohydrodynamics, and early theoretical studies often use a lot of artificial simplified assumptions. With the improvement of supercomputer computing ability and the maturation of magnetic fluid numerical simulation algorithms, people have been able to carry out direct numerical simulation research on such complex nonlinear dynamic problems. It overcomes the limitation of artificial hypothesis in early theoretical research. However, the current research is mainly based on the numerical simulation of magnetohydrodynamics, and the research on how the radiation transfer affects the MHD process is still lacking. The necessity and urgency of numerical simulation of radiative magnetohydrodynamics are emphasized. In view of the development of the numerical simulation program for radiative magnetofluids, the corresponding technical requirements are put forward from the aspects of radiation transfer, magnetic field processing, self-gravity of accretion disk, three-dimensional effect, non-ideal effect and dust effect, etc. The strategies for developing numerical simulation of radiative magnetofluids in this field are introduced.
【作者单位】：中国科学院云南天文台;中国科学院天体结构与演化重点实验室;
【基金】：国家自然科学基金(11373064,11521303) 云南省自然科学基金(2012FB187)
【分类号】：P185

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