具有磁风的黏性且自引力的原行星盘长期演化
Secular evolution of viscous and self-gravitating protoplanetary discs with magnetic winds
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中文总结 AI 辅助
本研究通过全球数值模拟，综合评估黏性、磁风和自引力三种机制在原行星盘演化中的作用，发现不同阶段各机制主导，并强调长期模拟需综合考量。
中文摘要 AI 辅助
传统上，人们认为盘在湍流黏性的影响下演化，尽管该机制的重要性近来受到质疑。作为替代，磁盘风或引力不稳定性可被考虑，但在这三种机制中，哪一种在特定演化阶段贡献最大仍是一个悬而未决的问题。我们展示了在薄盘极限下、盘寿命时间尺度上的原行星盘演化的全球数值流体动力学模拟，其中包含了质量和角动量输运的所有三种机制。我们计算了引力、黏性和磁力矩，以评估每种机制的贡献。我们发现，这些输运机制在盘中占据不同的影响区域，具体取决于演化阶段：早期阶段盘自引力的主导地位被磁盘风和黏性的盛行所取代，后者在盘外围尤其相关。我们表明，盘质量的显著减少仅在嵌入阶段结束后发生。盘的黏性扩展抑制仅对最强的风实现；否则，盘在模拟结束前持续增大尺寸。螺旋结构有助于尘埃在盘中的暂时滞留。然而，这不足以阻止尘埃在长时间尺度上的耗竭。结果强调了在长期模拟原行星盘时采用综合方法的重要性，不应将任何单一的质量和角动量输运机制视为唯一的。
英文摘要
Traditionally, the disc is believed to evolve under the influence of turbulent viscosity, although the importance of this mechanism has recently been questioned. Alternatively, magnetic disc wind or gravitational instability could be considered, but which of these three mechanisms contributes the most at a given evolutionary stage remains an open question. We present global numerical hydrodynamic simulations of protoplanetary disc evolution in the thin-disc limit on disc lifetime timescales, including all three mechanisms of mass and angular momentum transport. We calculate the gravitational, viscous, and magnetic torques to assess the contribution of each mechanism. We found that these transport mechanisms occupy distinct zones of influence in the disc depending on the stage of evolution: the dominance of disc self-gravity during the early phase is replaced by the prevalence of magnetic disc wind and viscosity, with the latter being especially relevant at the disc periphery. We show that a noticeable decrease in disc mass occurs only after the termination of the embedded phase. The suppression of disc viscous spreading is achieved only for the most intense wind; otherwise, the disc continues to grow in size till the end of simulations. The spiral structure contributes to the temporary retention of dust in the disc. However, this is insufficient to prevent the depletion of dust on long timescales. The results emphasize the importance of a comprehensive approach to long-term simulations of protoplanetary discs with no single mechanism of mass and angular momentum transport regarded as exclusive.
发表机构
- Research Institute of Physics, Southern Federal University（南联邦大学物理研究所）
- Faculty of Physics, Southern Federal University（南联邦大学物理学院）
- Institut für Astro- und Teilchenphysik, Universität Innsbruck（因斯布鲁克大学天体与粒子物理研究所）
- Mullard Space Science Laboratory, University College London（伦敦大学学院穆拉德太空科学实验室）
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