论文标题
CERES模拟混合物的光谱研究：对CERES上火山口峰材料（CCP）的深入分析
Spectral investigation of Ceres analogue mixtures: in-depth analysis of crater central peak material (ccp) on Ceres
论文作者
论文摘要
为了研究CCP中不同光谱斜率的原因，产生了不同晶粒大小的谷物大小的模拟混合物，加热以去除大气水的吸收，并进行了光谱分析。首先，将CERES表面组成的末端成员（使用抗磷酸盐作为Mg-phyllosilicate，NH4-蒙特米硅酸盐，NH4--蒙特米钛矿为Nh4-磷酸盐，作为碳酸盐岩作为碳酸盐岩，将石墨作为深色成分），混合在一起，获得了具有不同的erse reptrum supperters supperters的混合物，并获得了相似的混合物，并识别出频谱的相似性。用晶粒尺寸为0-25μM，25-50 MIC和50-100 MIC获得混合物，并在T = 300 K和T = 200 K处进行光谱分析（在VIR观察过程中，表面ceres温度的典型特征）。最相似的CERES模拟混合物由白云岩（18％），石墨（27％），抗牙石（32％）和NH4--蒙特米隆（29％）组成，这项工作的结果表明，这种混合物与ceres最年轻的谷物区域更相似，尤其是ceres的平均水平。除了出现细小尺寸的深色分量外，还需要考虑末端会员组成和晶粒尺寸的小变化。此外，可以通过应用一些模拟CERES上的空间风化的过程（作为微量准星的影响和太阳风辐照），即激光和离子辐照来获得表征平均CERES光谱的正频谱。结论是，在Ceresare上的最年轻的CCP可能是由较新鲜和弱加工的混合物组成的，与细小的深色材料密切分散：结果，最年轻的材料的反射光谱在1.2-1.9 MIC范围内显示出负斜率。在较旧的CCP中观察到的红色斜率可能是空间风化对新鲜材料的影响的结果
In order to investigate the causes of different spectral slope in ccps, different grain-sizes of Ceres analogue mixtures were produced, heated to remove absorption of atmospheric water, and spectrally analyzed. First, the end-members which compose the Ceres surface (using the antigorite as Mg-phyllosilicate, the NH4-montmorillonite as NH4-phyllosilicate, the dolomite as carbonate and the graphite as dark component), were mixed, obtaining mixtures with different relative abundance, and identifying the mixture with the reflectance spectrum most similar to the average Ceres spectrum. The mixtures were obtained with grain size of 0-25 μm, 25-50 mic and 50-100 mic, were heated and spectrally analysed at T= 300 K and T=200 K (typical for surface Ceres temperature during VIR observations). The most similar Ceres analogue mixture is composed of dolomite (18%), graphite (27%), antigorite (32%) and NH4-montmorillonite (29%) and the results of this work suggest that this mixture is more similar to the Ceres youngest region than to the Ceres average, in particular for the negative slope of spectrum. Small variation in the composition and grain size of end-members need to be considered, in addition to the occurrence of a dark component dispersed in fine size. Furthermore, the positive spectral slope that characterizes the mean Ceres spectrum can be obtained by the application of some processes simulating the space weathering on Ceres (as micro-meteoritic impacts and solar wind irradiation), i.e. laser and ion irradiation. As conclusion, youngest ccps on Ceresare probably composed by fresher and weakly processed mixture with fine dark material intimately dispersed: as a result, the reflectance spectra of youngest material show a negative slope in the 1.2-1.9 mic range. The redder slope observed in the older ccps is probably the consequence of the space weathering effects on fresher material
