论文标题
可观察的星际物体中逆行轨道过多
Retrograde orbits excess among observable interstellar objects
论文作者
论文摘要
在这项工作中，我们研究了星际对象（ISO）的轨道分布，可由未来的宽场国家科学基金会Vera C. Rubin天文台（VRO）观察到。我们生成ISO的合成人群，并在10年内模拟其胚层，以便根据本调查的标称特征选择VRO可以观察到的属性。我们发现，可观察的ISO的种群应显着偏向逆行物体。这种偏见的强度与种群的尺寸频率分布（SFD）以及近日距离的斜率相关。较陡的SFD斜率导致逆行轨道的比例增加，也导致中位轨道倾斜度。另一方面，较大的周围距离会导致轨道倾斜的更对称分布。我们认为，这是Holetschek效应的结果，这已经建议在长时间彗星的轨道分布中引起观察性偏见。我们发现的最重要的含义是，过多的逆行轨道取决于尺寸和周围距离。因此，可以使用进型/逆行轨道比和发现人口的中位数倾斜度来估计ISO的基本真实人群的SFD。
In this work we investigate the orbital distribution of interstellar objects (ISOs), observable by the future wide-field National Science Foundation Vera C. Rubin Observatory (VRO). We generate synthetic population of ISOs and simulate their ephemerides over a period of 10 years, in order to select those which may be observed by the VRO, based on the nominal characteristics of this survey. We find that the population of the observable ISOs should be significantly biased in favor of retrograde objects. The intensity of this bias is correlated with the slope of the size-frequency distribution (SFD) of the population, as well as with the perihelion distances. Steeper SFD slopes lead to an increased fraction of the retrograde orbits, and also of the median orbital inclination. On the other hand, larger perihelion distances result in more symmetric distribution of orbital inclinations. We believe that this is a result of the Holetschek effects, which is already suggested to cause observational bias in orbital distribution of long period comets. The most important implication of our findings is that an excess of retrograde orbits depends on the sizes and the perihelion distances. Therefore, the prograde/retrograde orbits ratio and the median inclination of the discovered population could, in turn, be used to estimate the SFD of the underlying true population of ISOs.
