OSSOS. XV. Probing the Distant Solar System with Observed Scattering TNOs
OSSOS. XV. Probing the Distant Solar System with Observed Scattering TNOs
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奥索斯。
DOI：
10.3847/1538-3881/ab2383
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
J. Petit
中科院分区：
文献类型：
--
作者：
N. Kaib;R. Pike;S. Lawler;M. Kovalik;C. Brown;M. Alexandersen;M. Bannister;B. Gladman;J. Petit
大多数已知的海王星外天体（trans-Neptunian objects，TNO）的轨道倾角与经典柯伊伯带的起源一致;然而，这些“散射TNO”中的一小部分的倾角对于这个起源来说太大了（i > 45°）。这些散射的异常值以前被认为是来自奥尔特云的闯入者或未被发现的行星的证据。在这里，我们测试这些假设使用N体模拟和69半人马座和散射TNO检测外太阳系起源调查及其前身。我们确认，所观察到的散射物体不能仅仅来自经典的柯伊伯带，我们表明，奥尔特云和遥远的行星产生可观察到的高度倾斜的散射体。虽然奥尔特云的高度倾斜散射体的数量比观测到的少103倍，但来自太阳星系迁移或诞生星团的奥尔特云富集可以解决这个问题。与此同时，一个遥远的，低偏心率5 M的小行星复制了观察到的高度倾斜的散射体的比例，但整体倾斜分布比观察到的更兴奋。此外，这颗遥远的行星在分离的TNO之间产生了纵向不对称性，这种不对称性不像通常假设的那样极端，并且其方向在已知TNO所跨越的近日点范围内反转。为了进一步研究这些特征，需要更完整的模型来探索行星的动力学起源。我们的工作表明，探测到的散射体的轨道分布是对未观测到的遥远太阳系的有力约束。
Most known trans-Neptunian objects (TNOs) that gravitationally scatter off the giant planets have orbital inclinations that are consistent with an origin from the classical Kuiper Belt; however, a small fraction of these “scattering TNOs” have inclinations that are far too large (i > 45°) for this origin. These scattering outliers have previously been proposed to be interlopers from the Oort cloud or evidence of an undiscovered planet. Here we test these hypotheses using N-body simulations and the 69 centaurs and scattering TNOs detected in the Outer Solar Systems Origins Survey and its predecessors. We confirm that observed scattering objects cannot solely originate from the classical Kuiper Belt, and we show that both the Oort cloud and a distant planet generate observable highly-inclined scatterers. Although the number of highly-inclined scatterers from the Oort Cloud is ∼3 times less than observed, Oort cloud enrichment from the Sun’s galactic migration or birth cluster could resolve this. Meanwhile, a distant, low-eccentricity 5 M⊕ planet replicates the observed fraction of highly-inclined scatterers, but the overall inclination distribution is more excited than observed. Furthermore, the distant planet generates a longitudinal asymmetry among detached TNOs that is less extreme than often presumed and its direction reverses across the perihelion range spanned by known TNOs. More complete models that explore the dynamical origins of the planet are necessary to further study these features. With well-characterized observational biases, our work shows that the orbital distribution of detected scattering bodies is a powerful constraint on the unobserved distant solar system.
评估第九行星存在时太阳系外天体的动态稳定性
DOI：
10.3847/1538-3881/aa7aa2
发表时间：
2017
期刊：
The Astronomical Journal
影响因子：
--
作者：
Becker, Juliette C.;Adams, Fred C.;Khain, Tali;Hamilton, Stephanie J.;Gerdes, David
通讯作者：
Gerdes, David
DOI：
10.3847/1538-3881/aa6db5
发表时间：
2017
期刊：
The Astronomical Journal
影响因子：
--
作者：
Bannister M
通讯作者：
Bannister M