论文标题
Kuiper Belt物体(486958)ARROKOTH周围动态环境中粒子的命运
The fate of particles in the dynamical environment around Kuiper Belt object (486958) Arrokoth
论文作者
论文摘要
由New Horizons Mission瞄准的触点二进制Kuiper Belt对象(486958)Arrokoth具有独特的斜率图案,这是其不规则的双齿型表面形状和高旋转周期的结果。因此,其表面上的某些特殊的地形区域被倾向于丢失或积累物质,作为长圆形抑郁症特征,一种称为马里兰州的撞击火山口,在其小叶上。 arrokoth的平衡点也与这些表面特征附近的环境结构直接相关。在这项工作中,我们在Arrokoth周围进行了数值模拟,以探索接近平衡点的颗粒的命运及其与其表面特征的动态联系。我们的结果表明,arrokoth的旋转roche叶内部的一个环中的大多数颗粒落在马里兰州撞击火山口的赤道区域附近,或靠近大叶上的明亮斑点区域。同样,球形云轨道上的颗粒在接近马里兰州火山口和明亮斑点区域的低音宽容区域附近优先积聚。相比之下,像大叶上的ll_term边界一样,有几个颗粒将落在它们的截然相反的区域。高宽容是那些更空虚的影响,就像在极地站点一样。另外,大于几微米的颗粒在ARROKOTH周围的环境中不会受到太阳辐射压力的影响。
The contact binary Kuiper Belt object (486958) Arrokoth, targeted by New Horizons mission, has a unique slope pattern, which is a result of its irregular bilobate surface shape and high spin period. Thus, some peculiar topographic regions on its surface are predisposed to lose or accumulate material, as a long circular depression feature, an impact crater called Maryland, on its small lobe. The equilibrium points of Arrokoth are also directly related to the structure of the environment near these surface features. In this work, we performed numerical simulations around Arrokoth to explore the fate of particles close to equilibrium points and their dynamical connection with its surface features. Our results suggest that most of these particles in a ring inside the Arrokoth's rotational Roche lobe fall near the equatorial region of the Maryland impact crater or close to the Bright spots area on the large lobe. Also, particles in a spherical cloud orbiting Arrokoth accumulate preferentially near low-mid-latitudes regions close to the longitudes of Maryland crater and Bright spots area. In contrast, a few particles will fall in regions diametrically opposite to them, as in the LL_Term boundary on the large lobe. High-latitudes are those more empty of impacts, as in polar sites. In addition, particles larger than a couple of microns are not significantly perturbed by solar radiation pressure in the environment around Arrokoth.