在可见光下对菲比环的首次观测
First observations of the Phoebe ring in optical light
摘要：
土卫九环是土星最大也是最暗的环，位于土星著名的主环之外。它主要来源于与土星最大的不规则卫星菲比的碰撞，可能是通过随机的宏观碰撞，或者通过更稳定的微流星体轰击。该环是由斯皮策太空望远镜在24 $μ$ m处发现的，其正常光学深度为$\sim 2 \times 10^{-8}$（Verbiscer等人，2009年）。我们报告的第一个观测太阳光散射的菲比环使用卡西尼号飞船的国际空间站相机在光学波长。我们发现，$\approx 130-210$土星半径（$R_S$）之间的物质从行星产生的I/F为$1.7 \pm 0.1 \times 10^{-11}$每$R_S$的视线距离通过磁盘。结合我们的测量与斯皮策红外数据，我们可以对环粒子的光散射特性进行限制。根据粒子的假设相函数，导出的单次散射散射可以匹配Phoebe的黑暗风化层或更明亮的次表面材料挖掘的宏观影响Phoebe的光度模型。
英文摘要：
The Phoebe ring, Saturn's largest and faintest ring, lies far beyond the planet's well-known main rings. It is primarily sourced by collisions with Saturn's largest irregular satellite Phoebe, perhaps through stochastic macroscopic collisions, or through more steady micrometeoroid bombardment. The ring was discovered with the Spitzer Space Telescope at 24 $μ$m and has a normal optical depth of $\sim 2 \times 10^{-8}$ (Verbiscer et al. 2009). We report the first observations of sunlight scattered off the Phoebe ring using the Cassini spacecraft's ISS camera at optical wavelengths. We find that material between $\approx 130-210$ Saturnian radii ($R_S$) from the planet produces an I/F of $1.7 \pm 0.1 \times 10^{-11}$ per $R_S$ of the line-of-sight distance through the disk. Combining our measurements with the Spitzer infrared data, we can place constraints on the ring-particles' light-scattering properties. Depending on the particles' assumed phase function, the derived single-scattering albedo can match either photometric models of Phoebe's dark regolith or brighter sub-surface material excavated by macroscopic impacts on Phoebe.
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