摘要
以行星和小岩屑動態系統來研究岩屑盤的分布密度。在本論文中，我們主要是探討β參數對Fomalhaut的岩屑盤動態系統的影響，β的值是指輻射壓力和萬有引力之間的比率。

Abstract
The planets and grains' dynamical models are employed to study the density distribution of debris disc. In this thesis, we investigate the effects of β, where β is the value of the ratio between the radiation pressure force and the gravitational force, to simulate the Fomalhaut's disc.

Contents
1. Introduction --- 1
2. Fomalhaut b and a Dust Grain --- 3
2.1 The Units --- 3
2.2 The Equations of Motion of Fomalhaut b --- 4
2.3 The Equations of Motion of a Dust Grain --- 5
3. Simulations for the Initial Circular Motion of Fomalhaut b --- 6
3.1 The Initial Conditions of Fomalhaut b --- 7
3.2 The Initial Conditions of a Dust Grain --- 9
3.3 The Effect of β on One Grain's Orbital Evolution --- 10
3.4 Simulations Multiple Grains --- 17
4. Conclusions --- 35
5. Bibliography --- 36
6. Appendix --- 37

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