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Computer simulations of planetary accretion dynamics: Sensitivity to initial conditionsThe implications and limitations of program ACRETE were tested. The program is a scheme based on Newtonian physics and accretion with unit sticking efficiency, devised to simulate the origin of the planets. The dependence of the results on a variety of radial and vertical density distribution laws, the ratio of gas to dust in the solar nebula, the total nebular mass, and the orbital eccentricity of the accreting grains was explored. Only for a small subset of conceivable cases are planetary systems closely like our own generated. Many models have tendencies towards one of two preferred configurations: multiple star systems, or planetary systems in which Jovian planets either have substantially smaller masses than in our system or are absent altogether. But for a wide range of cases recognizable planetary systems are generated - ranging from multiple star systems with accompanying planets, to systems with Jovian planets at several hundred AU, to single stars surrounded only by asteroids.
Document ID
19770006045
Document Type
Contractor Report (CR)
Authors
Isaacman, R. (Cornell Univ. Ithaca, NY, United States)
Sagan, C. (Cornell Univ. Ithaca, NY, United States)
Date Acquired
September 3, 2013
Publication Date
October 1, 1976
Subject Category
LUNAR AND PLANETARY EXPLORATION
Report/Patent Number
NASA-CR-149214
CRSR-648
Funding Number(s)
CONTRACT_GRANT: NGR-33-010-082
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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