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arXiv 2302.09987astro-ph.EPastro-ph.IM
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行星类似物的中红外光谱学:行星遥感数据库

Mid-infrared spectroscopy of planetary analogs: A database for planetary remote sensing

A. Morlok, S. Klemme, I. Weber, A. N. Stojic, M. Sohn, H. Hiesinger, J. Helbert

摘要:

欧空局/日本宇宙航空研究开发机构BepiColombo飞行任务上的MERTIS(水星辐射计和热红外光谱仪)仪器将提供中红外数据,这对确定水星表面矿物特性至关重要。为了解释结果,我们正在创建中红外光谱数据库。作为合成玻璃的研究,这是作为模拟材料的遥感和建模数据的解释的一部分,我们提出中红外数据的模拟材料的水星风化层,表面和地幔成分。此外,我们还提供了类似地球、月球、金星和火星岩石的数据,以获得连贯的图像。模拟样品已首次通过光学显微镜,拉曼光谱和EMPA表征。在2.5至18微米(550至2000 cm-1)的中红外范围内研究了粉末级分(0-25微米、25-63微米、63-125微米和125 - 250微米)的反射率,还获得了额外的显微FTIR分析。水星表面和风化层类似物的尺寸分数的结果显示出非晶材料的典型特征,其中Christiansen特征(CF)为8至8.1微米,Reststrahlen带(RB)为9.8至9.9微米,并且透明度特征(TF)为12微米。六个散装硅酸盐汞类似物有不同的CF位置从8.1到9微米,与RB晶体功能的各种橄榄石占主导地位的大多数样品。类似地,其他行星体的块状硅酸盐类似物显示出表面类似物的玻璃状特征,CF从7.9微米(地球陆壳)到8.3微米(月海),强RB从9.5微米(地球陆壳)到10.6微米(月海和高地)。对于玻璃状类似物,TF通常很弱。

英文摘要:

The MERTIS (MErcury Radiometer and Thermal Infrared Spectrometer) instrument onboard the ESA/JAXA BepiColombo mission will provide mid-infrared data, which will be crucial to characterize the surface mineralogy of Mercury. In order to interpret the results, we are creating a database of mid infrared spectra. As part of a study of synthetic glasses which are to serve as analog materials for the interpretation of remote sensing and modeling data, we present mid infrared data for analog materials of Mercury regolith, surface and mantle compositions. In addition, we provide data for similar analogs of Earth, Moon, Venus, and Mars rocks for a coherent picture. The analog samples have been first characterized by optical microscopy, Raman spectroscopy and EMPA. Powdered size fractions (0-25 micron, 25-63 micron, 63-125 micron, and 125 -250 micron) were studied in reflectance in the mid-infrared range from 2.5 to 18 micron (550 to 2000cm-1), additional micro FTIR analyses were also obtained. Results for the size fractions of the surface and regolith analogs for Mercury show typical features for amorphous material with Christiansen Features (CF) at 8 to 8.1 micron, Reststrahlen Bands (RB) at 9.8 to 9.9 micron, and the Transparency Feature (TF) at 12 micron. The six bulk silicate Mercury analogs have varying CF positions from 8.1 to 9 micron, with RB crystalline features of various olivines dominating in most samples. Similarly, bulk silicate analogs of the other planetary bodies show glassy features for the surface analogs with CF from 7.9 micron (Earth Continental Crust) to 8.3 micron (Lunar Mare), strong RB from 9.5 micron (Earth Continental Crust ) to 10.6 micron (Lunar Mare and Highlands). TF are usually very weak for the glassy analogs.

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