Formation of the polar debris disc around 99 Herculis
Formation of the polar debris disc around 99 Herculis
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99 Herculis 周围极地碎片盘的形成
DOI：
10.1093/mnras/staa654
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发表时间：
2020
影响因子：
4.8
通讯作者：
R. Martin
中科院分区：
文献类型：
--
作者：
Jeremy L. Smallwood;A. Franchini;Cheng Chen;Eric Becerril;S. Lubow;Chao;R. Martin
我们研究了围绕偏心轨道双星 99 Herculis 观察到的近极排列（垂直于双星轨道平面）碎片环的形成机制。最初倾斜的非极性碎片环或盘不会保持平坦，也不会演变成极性配置，因为差动节点进动的影响会改变其平坦结构。然而，由于维持盘平面度的压力以及允许盘增加其倾斜度的粘性耗散，在偏心双星周围嵌入良好耦合固体的气盘可能会演变成极性配置。一旦气体盘消散，碎片盘就处于极对齐状态，其中几乎没有进动。我们使用三维流体动力学模拟、线性理论和粒子动力学来研究未对准的周围双星气盘的演化，并探索初始盘倾斜、质量和尺寸的影响。我们发现，对于大范围的参数空间，极对准时间尺度比气盘的寿命短。使用观测到的与极地成 3° 的对齐水平，我们将气体扩散时气体盘的质量上限设置为约 $0.014 \, \mathrm{M}_\odot$。我们得出的结论是，99 Her 附近的极地碎片盘可以解释为最初适度倾斜的带有嵌入固体的气体盘的结果。这样的圆盘可能为极地行星的形成提供环境。
We investigate the formation mechanism for the observed nearly polar aligned (perpendicular to the binary orbital plane) debris ring around the eccentric orbit binary 99 Herculis. An initially inclined non-polar debris ring or disc will not remain flat and will not evolve to a polar configuration, due to the effects of differential nodal precession that alter its flat structure. However, a gas disc with embedded well coupled solids around the eccentric binary may evolve to a polar configuration as a result of pressure forces that maintain the disc flatness and as a result of viscous dissipation that allows the disc to increase its tilt. Once the gas disc disperses, the debris disc is in a polar aligned state in which there is little precession. We use three-dimensional hydrodynamical simulations, linear theory, and particle dynamics to study the evolution of a misaligned circumbinary gas disc and explore the effects of the initial disc tilt, mass, and size. We find that for a wide range of parameter space, the polar alignment time-scale is shorter than the lifetime of the gas disc. Using the observed level of alignment of 3° from polar, we place an upper limit on the mass of the gas disc of about $0.014 \, \mathrm{M}_\odot$ at the time of gas dispersal. We conclude that the polar debris disc around 99 Her can be explained as the result of an initially moderately inclined gas disc with embedded solids. Such a disc may provide an environment for the formation of polar planets.
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DOI：
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发表时间：
2012-03
影响因子：
33.3
作者：
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DOI：
10.1111/j.1365-2966.2009.15773.x
发表时间：
2010
影响因子：
4.8
作者：
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