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arXiv 2102.02220astro-ph.EP
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过去在极端的外海王星空间近距离接触的记忆:使用纯随机搜索寻找看不见的行星

Memories of past close encounters in extreme trans-Neptunian space: Finding unseen planets using pure random searches

C. de la Fuente Marcos, R. de la Fuente Marcos

摘要:

上下文已知的极端海王星外天体(ETNO)所遵循的路径有效地避免了来自四颗巨行星的直接引力摄动,但它们的轨道偏心率在0.69-0.97之间。太阳系动力学研究表明,如此高的离心率值可以通过近距离接触或长期扰动产生。在这两种情况下,都需要存在尚未发现的跨冥王星行星。目标。如果已知的ETNO的高偏心率是相对较近的近距离遭遇假定行星的结果,那么相当大的ETNO群与它们假定的扰动的相互节点距离可能仍然足够小,可以通过几何学来识别。为了证实或拒绝这种可能性,我们使用了蒙特卡罗随机搜索技术。方法.当两个任意轨道的交点距离足够小时,它们可能会发生近距离相遇。我们生成了数十亿个随机行星轨道,参数在相关范围内,并计算了相互节点距离与一组随机生成的轨道,参数与已知的ETNO及其不确定性一致。我们监测了哪些行星轨道与合成ETNO的潜在近距离接触次数最多,并研究了由此产生的分布。结果我们提供了狭窄的范围内的假定行星的轨道参数,可能经历了轨道变化遇到已知的ETNO。结论.我们的计算表明,如果散射是已知ETNO轨道修改的主要来源,则需要多个扰动。扰动者的位置可能不会超过600 AU,它们必须遵循适度偏心和倾斜的轨道,才能与多个已知的ETNO近距离相遇。

英文摘要:

Context. The paths followed by the known extreme trans-Neptunian objects (ETNOs) effectively avoid direct gravitational perturbations from the four giant planets, yet their orbital eccentricities are in the range between 0.69-0.97. Solar system dynamics studies show that such high values of the eccentricity can be produced via close encounters or secular perturbations. In both cases, the presence of yet-to-be-discovered trans-Plutonian planets is required. Aims. If the high eccentricities of the known ETNOs are the result of relatively recent close encounters with putative planets, the mutual nodal distances of sizeable groups of ETNOs with their assumed perturber may still be small enough to be identifiable geometrically. In order to confirm or reject this possibility, we used Monte Carlo random search techniques. Methods. Two arbitrary orbits may lead to close encounters when their mutual nodal distance is sufficiently small. We generated billions of random planetary orbits with parameters within the relevant ranges and computed the mutual nodal distances with a set of randomly generated orbits with parameters consistent with those of the known ETNOs and their uncertainties. We monitored which planetary orbits had the maximum number of potential close encounters with synthetic ETNOs and we studied the resulting distributions. Results. We provide narrow ranges for the orbital parameters of putative planets that may have experienced orbit-changing encounters with known ETNOs. Conclusions. Our calculations suggest that more than one perturber is required if scattering is the main source of orbital modification for the known ETNOs. Perturbers might not be located farther than 600 AU and they have to follow moderately eccentric and inclined orbits to be capable of experiencing close encounters with multiple known ETNOs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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