论文标题
哈勃太空望远镜的露西任务目标的紫外线光谱
Ultraviolet Spectroscopy of Lucy Mission Targets with the Hubble Space Telescope
论文作者
论文摘要
最近发起的露西任务旨在通过研究木星特洛伊木马（Jupiter Trojans），这是与木星共同轨道的人群，以了解太阳能系统的动态历史。使用Hubble Space望远镜的G280 Grism在五个Lucy Mission目标中的四个紫外线光谱中获得的G280 Grism - （617）Patroclus-Menoetius，（（11351）Leucus，（11351）Leucus，（3548）Eurybates和Eurybates和Eurybates，以及（21900）Orus-Orus-Orus-Orus-Orus-Orus-Orus-Orus-Orus-Orus-Orus搜索新颖的光谱特征。我们观察到局部反射率在0.4 $ $ m时的最低限度，伴随着反射率从patroclus和orus的光谱中的0.35-0.3 $μ$ m增加。我们使用瑞利散射和几何光学的原理来开发一个HAPKE光学模型，以研究该特征是否可以通过特洛伊木马表面上的亚显微晶粒的存在来解释。近乎紫外的“凹凸”特征可以通过细粒度的透透（铁，无定形碳或石墨）散射，粒度范围为20-80 nm。
The recently launched Lucy mission aims to understand the dynamical history of the Solar System by examining the Jupiter Trojans, a population of primitive asteroids co-orbital with Jupiter. Using the G280 grism on the Hubble Space Telescope's Wide Field Camera 3 we obtained near ultraviolet spectra of four of the five Lucy mission targets -- (617) Patroclus-Menoetius, (11351) Leucus, (3548) Eurybates, and (21900) Orus -- to search for novel spectral features. We observe a local reflectance minimum at 0.4 $μ$m accompanied by an increase in reflectance from 0.35-0.3 $μ$m in the spectra of Patroclus and Orus. We use the principles of Rayleigh scattering and geometric optics to develop a Hapke optical model to investigate whether this feature can be explained by the presence of submicroscopic grains on Trojan surfaces. The near ultraviolet "bump" feature can be explained by scattering due to fine-grained opaques (iron, amorphous carbon, or graphite) with grain sizes ranging from 20 - 80 nm.
