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arXiv 1611.04480astro-ph.EP
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海王星外共振长期动力学的研究与应用

Study and application of the resonant secular dynamics beyond Neptune

Melaine Saillenfest, Marc Fouchard, Giacomo Tommei, Giovanni B. Valsecchi

摘要:

我们用一个长期的代表性来描述transneptunian对象的长期动态平均运动与海王星共振。所应用的模型在Saillenfest et al.(2016)中有详细描述。参数空间进行了系统的探索,表明长期的轨迹依赖于共振阶。近日点距离的高振幅振荡的报告和本地化的轨道参数的空间。特别是,我们表明,一个大的近日点距离是不是一个足够的标准,宣布一个对象是脱离行星。然而,这种机制无法解释塞德娜或2012 VP 113的轨道,因为它们的轨道倾斜度(考虑到它们的近日点距离很高)不足以被这种共振动力学驱动。长期的代表性突出了一个高近日点积累区的存在,由于共振类型1:k与海王星。该区域大致位于[100;300] AU的半长轴上,近日点距离为[50;70] AU,倾角为[30;50]°。除了直接来自散射盘的天体通量外,数值模拟表明,奥尔特云也是此类天体的重要来源。当然,由于该机制依赖于高阶共振中的脆弱捕获,因此我们的结论在显著外部扰动的情况下会崩溃。因此,探测到这样一个水库可能是探测外部太阳系的一个观测限制。

英文摘要:

We use a secular representation to describe the long-term dynamics of transneptunian objects in mean-motion resonance with Neptune. The model applied is thoroughly described in Saillenfest et al. (2016). The parameter space is systematically explored, showing that the secular trajectories depend little on the resonance order. High-amplitude oscillations of the perihelion distance are reported and localised in the space of the orbital parameters. In particular, we show that a large perihelion distance is not a sufficient criterion to declare that an object is detached from the planets. Such a mechanism, though, is found unable to explain the orbits of Sedna or 2012VP113, which are insufficiently inclined (considering their high perihelion distance) to be possibly driven by such a resonant dynamics. The secular representation highlights the existence of a high-perihelion accumulation zone due to resonances of type 1:k with Neptune. That region is found to be located roughly at semi-major axes in [100;300] AU, perihelion distances in [50;70] AU and inclinations [30;50]°. In addition to the flux of objects directly coming from the Scattered Disc, numerical simulations show that the Oort Cloud is also a substantial source for such objects. Naturally, as that mechanism relies on fragile captures in high-order resonances, our conclusions break down in the case of a significant external perturber. The detection of such a reservoir could thus be an observational constraint to probe the external Solar System.

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