The Solar Nebula as a Process–An Analytic Model
The Solar Nebula as a Process–An Analytic Model
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太阳星云作为一个过程——一个分析模型
DOI：
10.1006/icar.1998.5893
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发表时间：
1998
期刊：
影响因子：
3.2
通讯作者：
T. Stepinski
中科院分区：
文献类型：
--
作者：
T. Stepinski
摘要我们根据含时吸积盘理论建立了太阳星云的解析模型。到目前为止，这个问题只在数值上得到了解决。我们的模型提供了明确的公式的空间结构和时间演化的星云。该模型的特征仅在于三个主要参数：星云的初始质量、星云的初始角动量和粘性参数α。这些参数的值受到相对良好的约束。用我们的公式得到的太阳星云模型与以前发表的数值结果吻合得很好。分析模型的优势在于包含所有不同的场景，从而为星云的动力学演化提供更深入的见解。我们已经发现，星云的演化经历了不同的时期，每个时期都有不同的演化速率。不同时期的数量，以及星云演化历史的特征，取决于一组特定的参数。我们已经证明，即使参数值的微小变化也会产生非常不同的进化情景。分析模型可以帮助连接磁盘理论的观察，以及提供一个有价值的工具，宇宙起源的研究。
Abstract We have constructed an analytic model of the solar nebula based on a time-dependent accretion disk theory. Until now, this problem has been solved only numerically. Our model offers explicit formulas for a spatial structure and temporal evolution of the nebula. The model is characterized by only three major parameters: initial mass of the nebula, initial angular momentum of the nebula, and viscosity parameter α. The values of these parameters are relatively well constrained. Models of the solar nebula obtained using our formulas are in good agreement with previously published numerical results. An analytic model has the advantage of embodying all the different scenarios, thus providing much deeper insights into the dynamical evolution of the nebula. We have found that the evolution of the nebula passes through different epochs, each characterized by a different rate of evolution. The number of different epochs, and thus the character of the evolutionary history of the nebula, depends on a particular set of parameters. We have shown that very different evolutionary scenarios arise from even modest changes in the values of the parameters. The analytic model can help to link disk theory to observations, as well as to provide a valuable tool for cosmogonic studies.
影响因子：
3.2
作者：
V. Mannings;A. Boss;S. Russell
通讯作者：
V. Mannings;A. Boss;S. Russell