论文标题
半人马座和巨型行星交叉种群：起源和分布
Centaur and giant planet crossing populations: origin and distribution
论文作者
论文摘要
当前的巨型行星区域是一个过渡区域，在该区域中，跨性别物体（TNOS）越过成为木星家族彗星（JFCS）的方式。它们的动力学行为是由TNOS的内在动力学特征以及与巨型行星的相遇来调节的。考虑到当前的太阳系配置考虑到当前的配置，我们解决了研究其数量及其发展的巨型行星交叉（GPC）人口（$ 5.2 $ au $ <q <30 $ au）。从先前的研究中审查了该主题，并且还通过对散射磁盘对象（SDOS）的动力学演化的新数值模拟进行了解决。我们获得了GPC的内在轨道元素分布的模型。散射的磁盘代表了前GPC和半人马的主要来源，而Plutinos的贡献则位于一个低于SD的一个和两个数量级之间。我们从模型中获得GPC的数量和尺寸分布，从SD计算9600 GPC，使用$ d> 100 $ km和$ \ sim 10^8 $，$ d> 1 $ km在当前人口中。其他来源的贡献被认为可以忽略不计。半人马座区域的平均寿命为7.2 MYR，而GPC区域中SDO的平均寿命为68 MYR。后者取决于最初的倾向，是具有高倾斜度的倾斜度，即在GPC区域中生存最长的倾斜度。寿命与周围距离也存在相关性，其中较大的围栏会导致更长的寿命。对于前体和逆行对象，观察到的GPC的动态演变不同。逆行GPC的中位寿命低于前期的GPC，因此经历了相对更快的进化。但是，这种更快的进化很可能是由于大多数逆行GPC具有较低的近调值，然后寿命较低。
The current giant planet region is a transitional zone where transneptunian objects (TNOs) cross in their way to becoming Jupiter Family Comets (JFCs). Their dynamical behavior is conditioned by the intrinsic dynamical features of TNOs and also by the encounters with the giant planets. We address the Giant Planet Crossing (GPC) population (those objects with $5.2$ au $ < q < 30$ au) studying their number and their evolution from their sources, considering the current configuration of the Solar System. This subject is reviewed from previous investigations and also addressed by new numerical simulations of the dynamical evolution of Scattered Disk Objects (SDOs). We obtain a model of the intrinsic orbital element distribution of GPCs. The Scattered Disk represents the main source of prograde GPCs and Centaurs, while the contribution from Plutinos lies between one and two orders of magnitude below that from the SD. We obtain the number and size distribution of GPCs from our model, computing 9600 GPCs from the SD with $D > 100$ km and $\sim 10^8$ with $D > 1$ km in the current population. The contribution from other sources is considered negligible. The mean lifetime in the Centaur zone is 7.2 Myr, while the mean lifetime of SDOs in the GPC zone is of 68 Myr. The latter is dependent on the initial inclination, being the ones with high inclinations the ones that survive the longest in the GPC zone. There is also a correlation of lifetime with perihelion distance, where greater perihelion leads to longer lifetime. The dynamical evolution of observed GPCs is different for prograde and retrograde objects. Retrograde GPCs have lower median lifetime than prograde ones, thus experiencing a comparatively faster evolution. However, it is probable that this faster evolution is due to the fact that the majority of retrograde GPCs have low perihelion values and then, lower lifetimes.
