Dynamical structures of retrograde resonances: analytical and numerical studies

Dynamical structures of retrograde resonances: analytical and numerical studies
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逆行共振的动力学结构:分析和数值研究

DOI:
10.1093/mnras/stab960
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发表时间:
2021-04
影响因子:
4.8
通讯作者:
Li Jian
Li Jian
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lei Hanlun;Li Jian

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在这项工作中,通过解析和数值方法研究了逆行平均运动共振(MMRs)。首先,我们定义了一个新的共振角来描述逆行mmr,然后进行一系列正则变换来建立共振模型,其中相位肖像,共振中心和共振宽度可以解析确定。为了验证分析结果,利用截面的庞卡罗曲面进行了非微扰分析。在庞加莱剖面的生产中引入了一些修改,特别是可以直接比较解析结果和数值结果。发现相图与相关的庞卡罗剖面具有很好的对应关系,并且在共振宽度和共振中心位置上,解析结果与数值结果吻合得很好。最后,利用数值方法确定了全偏心范围内的共振宽度和共振中心。其中,2015 BZ509、2008 SO218、1999 LE31、2000 DG8、2014 AT28、2016 LS和2016 JK24等7颗已知逆行小行星都位于木星mmr逆行的振动带内。本工作的结果可能有助于理解逆行mmr内小行星的动力学演化。
In this work, retrograde mean motion resonances (MMRs) are investigated by means of analytical and numerical approaches. Initially, we define a new resonant angle to describe the retrograde MMRs and then perform a series of canonical transformations to formulate the resonant model, in which the phase portrait, resonant centre, and resonant width can be analytically determined. To validate the analytical developments, the non-perturbative analysis is made by taking advantage of Poincaré surfaces of section. Some modifications are introduced in the production of Poincaré sections and, in particular, it becomes possible to make direct comparisons between the analytical and numerical results. It is found that there exists an excellent correspondence between the phase portraits and the associated Poincaré sections, and the analytical results agree well with the numerical results in terms of the resonant width and the location of resonant centre. Finally, the numerical approach is utilized to determine the resonant widths and resonant centres over the full range of eccentricity. In particular, seven known examples of retrograde asteroids including 2015 BZ509, 2008 SO218, 1999 LE31, 2000 DG8, 2014 AT28, 2016 LS, and 2016 JK24 are found inside the libration zones of retrograde MMRs with Jupiter. The results obtained in this work may be helpful for understanding the dynamical evolution for asteroids inside retrograde MMRs.
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