The dynamics of Neptune Trojan - I. The inclined orbits

The dynamics of Neptune Trojan - I. The inclined orbits
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海王星特洛伊的动力学 - I. 倾斜轨道

DOI:
10.1111/j.1365-2966.2009.15203.x
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发表时间:
2009-06
影响因子:
4.8
通讯作者:
Sun Yi-Sui
Sun Yi-Sui
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhou Li-Yong;Dvorak Rudolf;Sun Yi-Sui

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研究了海王星特洛伊型轨道的稳定性。作为我们调查的第一部分,我们在本文中提出了一个倾斜轨道上的特洛伊木马的稳定性的全局视图。利用基于快速傅里叶变换的频率分析方法,我们在初始半长轴a0与倾角i 0的平面上构造了高分辨率的动力学映射。这些地图显示了三个最稳定的区域,i 0分别在(0 °,1 2 °)、(22 °,3 6 °)和(51 °,5 9 °)的范围内,这些区域最有可能发现特洛伊木马。前三角拉格朗日点L4和后三角拉格朗日点L5的地图之间的相似性证实了这两个点之间的动力学对称性。通过计算特洛伊运动的功率谱和固有频率,我们找出了触发混沌运动的机制。在高倾角下发现的Kozai共振改变了轨道的偏心率和倾角,而i 0 <$44 <$m附近的ν8长期共振则增加了偏心率。这两种机制导致偏心轨道和遇到天王星,引入强烈的扰动和驱动物体远离特洛伊轨道。这解释了特洛伊在高倾角(>60度)时的间隙和动力学图上44度左右的不稳定间隙。从数值结果导出了一个经验理论,其主要的长期共振位于(a0,i 0)的初始平面上。动力学图中的精细结构可以用这些长期共振来解释。
The stability of Trojan type orbits around Neptune is studied. As the first part of our investigation, we present in this paper a global view of the stability of Trojans on inclined orbits. Using the frequency analysis method based on the fast Fourier transform technique, we construct high-resolution dynamical maps on the plane of initial semimajor axis a0 versus inclination i0. These maps show three most stable regions, with i0 in the range of (0 ◦ ,1 2 ◦ ), (22 ◦ ,3 6 ◦ ) and (51 ◦ ,5 9 ◦ ), respectively, where the Trojans are most probably expected to be found. The similarity between the maps for the leading and trailing triangular Lagrange points L4 and L5 confirms the dynamical symmetry between these two points. By computing the power spectrum and the proper frequencies of the Trojan motion, we figure out the mechanisms that trigger chaos in the motion. The Kozai resonance found at high inclination varies the eccentricity and inclination of orbits, while the ν8 secular resonance around i0 ∼ 44 ◦ pumps up the eccentricity. Both mechanisms lead to eccentric orbits and encounters with Uranus that introduce strong perturbation and drive the objects away from the Trojan like orbits. This explains the clearance of Trojan at high inclination (>60 ◦ ) and an unstable gap around 44 ◦ on the dynamical map. An empirical theory is derived from the numerical results, with which the main secular resonances are located on the initial plane of (a0, i0). The fine structures in the dynamical maps can be explained by these secular resonances.
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