Modelling circumstellar discs with three-dimensional radiation hydrodynamics
Modelling circumstellar discs with three-dimensional radiation hydrodynamics
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DOI：
10.1111/j.1365-2966.2009.16199.x
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发表时间：
2009-12
影响因子：
4.8
通讯作者：
D. Acreman;T. Harries;D. Rundle
中科院分区：
文献类型：
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作者：
D. Acreman;T. Harries;D. Rundle
我们展示了将基于网格的辐射传输代码与平滑粒子流体动力学（SPH）代码相结合的结果，以生成用于建模辐射流体动力学的灵活系统。我们使用星周盘的基准模型来确定从 SPH 粒子构建网格密度分布的稳健方法。然后使用基准盘来确定辐射传输结果的准确性。我们发现圆盘内的光谱能量分布和温度分布对圆盘内边缘的表示很敏感，这主要取决于网格和 SPH 分辨率。然后使用该代码对金牛座 T 星周围的星周盘进行建模。当圆盘向平衡方向调整时，会引起圆盘中的垂直运动，导致尺度高度增强，从而拦截来自中心恒星的辐射。辐射的垂直传输使这些扰动能够影响光盘的中面温度。垂直运动随着时间的推移而衰减，并且圆盘最终达到同时流体静力学和辐射平衡的状态。
We present the results of combining a grid-based radiative transfer code with a smoothed particle hydrodynamics (SPH) code to produce a flexible system for modelling radiation hydrodynamics. We use a benchmark model of a circumstellar disc to determine a robust method for constructing a gridded density distribution from SPH particles. The benchmark disc is then used to determine the accuracy of the radiative transfer results. We find that the spectral energy distribution and the temperature distribution within the disc are sensitive to the representation of the disc inner edge, which depends critically on both the grid and SPH resolution. The code is then used to model a circumstellar disc around a T Tauri star. As the disc adjusts towards equilibrium, vertical motions in the disc are induced resulting in scaleheight enhancements which intercept radiation from the central star. Vertical transport of radiation enables these perturbations to influence the mid-plane temperature of the disc. The vertical motions decay over time, and the disc ultimately reaches a state of simultaneous hydrostatic and radiative equilibrium.