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arXiv 0904.4884astro-ph.EP
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从原行星吸积气体的辐射流体动力学模拟获得的环行星盘性质

Circumplanetary disc properties obtained from radiation hydrodynamical simulations of gas accretion by protoplanets

Ben A. Ayliffe, Matthew R. Bate

摘要:

我们研究了由原行星吸积气体的三维自引力辐射流体动力学模型中形成的环行星盘的性质。我们确定磁盘的大小,scaleheights,密度和温度分布不同的原行星质量,在太阳星云的不同颗粒不透明度。我们发现Quillen & Trilling(1998)对真空间隙(R_Hill/3)中的环行星盘半径的分析预测对高质量原行星形成的盘给出了很好的估计。行星圆盘的径向密度分布可以用r^-2和r^-3/2之间的幂律来描述。我们没有发现证据的环状密度增强,已发现在以前的一些模型的环行星盘。无论原行星质量或星云颗粒的不透明度如何,温度分布都遵循~r^-7/10的幂律。这些星盘总是有很大的尺度高度(H/r > 0.2),使得它们与环绕它们的星周星盘相比很厚,而且它们没有耀斑。

英文摘要:

We investigate the properties of circumplanetary discs formed in three-dimensional, self-gravitating radiation hydrodynamical models of gas accretion by protoplanets. We determine disc sizes, scaleheights, and density and temperature profiles for different protoplanet masses, in solar nebulae of differing grain opacities. We find that the analytical prediction of circumplanetary disc radii in an evacuated gap (R_Hill/3) from Quillen & Trilling (1998) yields a good estimate for discs formed by high mass protoplanets. The radial density profiles of the circumplanetary discs may be described by power-laws between r^-2 and r^-3/2. We find no evidence for the ring-like density enhancements that have been found in some previous models of circumplanetary discs. Temperature profiles follow a ~r^-7/10 power-law regardless of protoplanet mass or nebula grain opacity. The discs invariably have large scaleheights (H/r > 0.2), making them thick in comparison with their encompassing circumstellar discs, and they show no flaring.

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