Physics
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icar..132..100s&link_type=abstract
Icarus, Volume 132, Issue 1, pp. 100-112.
Physics
29
Scientific paper
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 alpha. 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.
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