Non-convergence of the critical cooling timescale for fragmentation of self-gravitating discs
Non-convergence of the critical cooling timescale for fragmentation of self-gravitating discs
复制标题
自重力圆盘破碎的临界冷却时间尺度不收敛
DOI：
10.1017/s1743921311020709
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
M. Bate
中科院分区：
文献类型：
--
作者：
F. Meru;M. Bate
摘要对自引力盘的碎裂边界进行了分辨研究。我们进行三维光滑粒子流体动力学（SPH）模拟光盘，以确定冷却时间尺度的临界值的轨道时间尺度，β临界值，是否收敛的分辨率增加。使用粒子数从31,250到1600万（迄今为止最高分辨率的模拟），我们没有发现收敛。相反，随着分辨率的增加，在较长的冷却时间尺度内发生碎裂。这些结果无疑表明β临界值比以前认为的要大。然而，缺乏收敛性也质疑是否存在临界值。根据这些结果，我们警告不要使用冷却时标或引力应力参数来推断引力不稳定性是否可能是观测到的行星系统的形成机制。
Abstract We carry out a resolution study on the fragmentation boundary of self-gravitating discs. We perform three-dimensional Smoothed Particle Hydrodynamics (SPH) simulations of discs to determine whether the critical value of the cooling timescale in units of the orbital timescale, βcrit, converges with increasing resolution. Using particle numbers ranging from 31,250 to 16 million (the highest resolution simulations to date) we do not find convergence. Instead, fragmentation occurs for longer cooling timescales as the resolution is increased. These results certainly suggest that βcrit is larger than previously thought. However, the absence of convergence also questions whether or not a critical value exists. In light of these results, we caution against using cooling timescale or gravitational stress arguments to deduce whether gravitational instability may or may not have been the formation mechanism for observed planetary systems.
引入平滑粒子流体动力学的混合辐射传递方法
DOI：
10.1111/j.1365-2966.2008.14373.x
发表时间：
2009
影响因子：
4.8
作者：
Forgan D
通讯作者：
Forgan D