标题： 海王星的环弧由共轨卫星限制：尘埃轨道演化通过太阳辐射 显示英文标题

标题： Neptune's ring arcs confined by coorbital satellites: dust orbital evolution through solar radiation

摘要： 旅行者2号图像确认了海王星周围存在环弧结构。 由于碰撞、耗散力以及不同的开普勒运动导致的扩散，这些结构需要一种约束机制来限制它们的扩展。 在这里，我们报告了一组关于由海王星、卫星加拉提亚、尘埃环粒子和假设的共轨卫星组成的系统数值模拟的结果。 这个动力学系统展示了一种最近形成的约束机制，即四个共轨卫星负责弧的方位角约束，而加拉提亚则负责其径向约束。 经过数值模拟后，粒子被分为四组：留在弧中的粒子、过渡性粒子、离开弧进入亚当斯环的粒子以及与共轨卫星发生碰撞的粒子。 我们的结果显示，在所有弧中，较小粒子的寿命最多为50年。 100年后，大约20%的较大粒子仍然存在于弧中。 根据我们的数值模拟，粒子应该在30年后存在于所有弧中，这是从发现弧到现在的这段时间。 我们的结果无法解释领先弧（Liberté 和 Courage）的消失，除非弧是由不同大小的粒子构成的。 分析表明，由于地间碎片与共轨卫星表面之间的碰撞产生的尘埃不会成为弧结构的来源。 显示英文摘要

摘要： Voyager 2 images confirmed the presence of ring arcs around Neptune. These structures need a confinement mechanism to constrain their spreading due to collisions, dissipative forces, and differential keplerian motion. Here we report the results of a set of numerical simulations of the system formed by Neptune, the satellite Galatea, dust ring particles, and hypothetical co-orbital satellites. This dynamical system depicts a recent confinement mechanism formed by four co-orbital satellites being responsible for the azimuthal confinement of the arcs, while Galatea responds for their radial confinement. After the numerical simulations, the particles were divided into four groups: particles that stay in the arcs, transient particles, particles that leave the arcs to the Adams ring, and particles that collide with the co-orbital satellites. Our results showed that in all arcs the lifetime of the smaller particles is at most 50 years. After 100 years about 20% of the total amount of larger particles is still present in the arcs. From our numerical simulations, the particles should be present in all arcs after 30 years, the period between the discovery of the arcs up to now. Our results can not explain the disappearance of the leading arcs, Liberte and Courage unless the arcs are formed by different particle sizes. Analysis of the dust production, due to collisions between interplanetary debris onto the surface of the co-orbital satellites, ruled out the hypothesis that small satellites close to or in the arc the structure could be its source.