Organic components of cometary nuclei and the effects of opaque phases on spectral detectability of cometary organics and minerals.

彗星核的有机成分以及不透明相对彗星有机物和矿物质光谱可探测性的影响。

• 批准号: 278130103
• 负责人: Dr. Liubov Moroz
• 金额: --
• 依托单位: Gemeinsame Forschungsgruppe Kombinierte Röntgenmethoden im BLiX und BESSY II - SyncLab
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/278130103?language=en
• 关键词: Organic; components; cometary; nuclei; effects

The research proposal is aimed at (1) development of a careful approach to spectroscopic identification and characterization of organics on the surfaces of comet nuclei by taking into account influence of opaque phases (in particular, Fe-sulfides), as well as possible optical alteration caused by irradiation of the surfaces with charged particles and thermal processing of organics at perihelion; (2) spectroscopic characterization of organic components exposed on the nucleus of comet 67P/Churyumov-Gerasimenko. These goals will be achieved through several different approaches, including laboratory experiments, theoretical calculations, and interpretation of new VIS-IR reflectance spectra of comet 67/P. The proposed work will include (1) spectral reflectance studies (0.4-20 micrometers) of analogue materials for cometary refractory organics, carefully selected based on the previous work and the most up-to-date information provided by the ESA's Rosetta mission; (2) spectral reflectance studies of unheated and heated intimate mixtures of Fe-sulfides with selected organics and minerals relevant to comets; (3) application of radiative transfer models to simulate reflectance spectra of organic-sulfide intimate mixtures and space weathering effects; (4) analysis/interpretation of the VIRTIS/Rosetta spectra of comet 67/P in terms of detectability and relative abundances of organic and inorganic surface constituents.; (5) comparative analysis of spectral variability among comet nuclei, dark TNOs, low albedo asteroids and carbonaceous meteorites based on the obtained results. The expected results can significantly contribute to our understanding the spectral variability among dark small bodies of the solar system, and provide new insights into the nature and distribution of organic materials throughout the outer solar system.

该研究计划的目的是（1）通过考虑不透明相的影响，开发一种仔细的方法，对彗星核表面的有机物进行光谱鉴定和表征（特别是铁硫化物），以及在近日点用带电粒子照射表面和有机物热处理可能引起的光学改变;（2）67 P/Churyumov-Gerasimenko彗星核有机组分的光谱特征。这些目标将通过几种不同的方法来实现，包括实验室实验、理论计算和解释彗星67/P的新的可见-红外反射光谱。拟议的工作将包括（1）光谱反射率研究（0.4-20微米）的彗星难熔有机物的类似材料，根据以前的工作和欧空局罗塞塔使命提供的最新信息精心挑选;（2）对未加热和加热的铁硫化物与选定的与彗星有关的有机物和矿物的密切混合物的光谱反射率研究;（3）应用辐射传输模型模拟有机硫化物紧密混合物的反射光谱和空间风化效应;（4）分析/解释67/P彗星VIRTIS/Rosetta光谱中有机和无机表面成分的可探测性和相对丰度。(5)在此基础上，对彗星核、暗TNO、低丰度小行星和碳质陨石的光谱变化进行了比较分析。预期的结果可以大大有助于我们了解太阳系暗小天体的光谱变化，并提供新的见解整个外太阳系的有机物质的性质和分布。