OSSOS. XVIII. Constraining Migration Models with the 2:1 Resonance Using the Outer Solar System Origins Survey
OSSOS. XVIII. Constraining Migration Models with the 2:1 Resonance Using the Outer Solar System Origins Survey
复制标题
DOI：
10.3847/1538-3881/ab480b
复制
发表时间：
2019-10
期刊：
影响因子：
--
通讯作者：
Y. Chen 陳;B. Gladman;K. Volk;R. Murray-Clay;M. Lehner;J. Kavelaars;Shiang-Yu 祥宇 Wang 王;H. Lin 林;P. S. Lykawka;M. Alexandersen;M. Bannister;S. Lawler;R. Dawson;S. Greenstreet;S. Gwyn;J. Petit
中科院分区：
文献类型：
--
作者：
Y. Chen 陳;B. Gladman;K. Volk;R. Murray-Clay;M. Lehner;J. Kavelaars;Shiang-Yu 祥宇 Wang 王;H. Lin 林;P. S. Lykawka;M. Alexandersen;M. Bannister;S. Lawler;R. Dawson;S. Greenstreet;S. Gwyn;J. Petit
共振动力学在外太阳系的过去演化和当前状态中起着重要作用。海王星共振人口的人口比例和空间分布是了解我们行星系统历史的直接线索。海王星2：1平均运动共振（“twotinos”）中物体的轨道结构有可能成为行星迁移过程的示踪剂。不同的迁移过程产生不同的架构，识别的特征良好的调查。然而，以前的特征调查只发现了一些twotino，使得无法模拟内在的twotino人口。凭借精心设计的节奏和近100%的跟踪成功率，外太阳系起源调查（OSSOS）发现了838个海王星外天体，其中34个是具有良好约束的天平动角度和振幅的安全的twotinos。我们使用OSSOS的twotinos和调查的表征参数通过OSSOS调查模拟器检查的内禀人口和轨道分布的twotinos。在95%的置信度下，估计的twotino人口Hr < 8.66（直径为100公里），与以前的低精度估计一致。我们还约束的倾斜分布的宽度，以一个相对较窄的值，并发现偏心率分布是一致的高斯集中在EC = 0.275与宽度EW = 0.06。我们发现两个中微子的光度函数是α = 0.6的单斜率指数函数。最后，第一次，我们有意义地限制对称twotinos的分数和领先的非对称岛屿的比例，这两个分数的范围是0.2-0.6。这些测量排除了海王星迁移历史的某些理论模型。
Resonant dynamics plays a significant role in the past evolution and current state of our outer solar system. The population ratios and spatial distribution of Neptune’s resonant populations are direct clues to understanding the history of our planetary system. The orbital structure of the objects in Neptune’s 2:1 mean-motion resonance (“twotinos”) has the potential to be a tracer of planetary migration processes. Different migration processes produce distinct architectures, recognizable by well-characterized surveys. However, previous characterized surveys only discovered a few twotinos, making it impossible to model the intrinsic twotino population. With a well-designed cadence and nearly 100% tracking success, the Outer Solar System Origins Survey (OSSOS) discovered 838 trans-Neptunian objects, of which 34 are securely twotinos with well-constrained libration angles and amplitudes. We use the OSSOS twotinos and the survey characterization parameters via the OSSOS survey simulator to inspect the intrinsic population and orbital distributions of twotinos. The estimated twotino population, with Hr < 8.66 (diameter ∼100 km) at 95% confidence, is consistent with the previous low-precision estimate. We also constrain the width of the inclination distribution to a relatively narrow value of and find that the eccentricity distribution is consistent with a Gaussian centered on ec = 0.275 with a width ew = 0.06. We find a single-slope exponential luminosity function with α = 0.6 for the twotinos. Finally, for the first time, we meaningfully constrain the fraction of symmetric twotinos and the ratio of the leading asymmetric islands; both fractions are in the range of 0.2–0.6. These measurements rule out certain theoretical models of Neptune’s migration history.