A search for polycyclic aromatic hydrocarbons over the Martian South Polar Residual Cap

A search for polycyclic aromatic hydrocarbons over the Martian South Polar Residual Cap
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在火星南极残余盖上寻找多环芳烃

DOI:
10.1016/j.icarus.2018.03.008
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发表时间:
2018
期刊:
影响因子:
3.2
通讯作者:
Campbell J
Campbell J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Campbell J

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在高光谱数据分析的基础上,对火星南极残留冰帽(SPRC)的成分填图进行了研究,特别是对冰中尘埃中有机特征的检测。SPRC是这次调查的主要兴趣区域,因为覆盖在表面的独特的CO2冰升华特征。这些平坦的圆形凹陷是高度动态的,我们推测经常暴露出以前在冬季困在冰层中的尘埃颗粒。在这里,我们确定了SPRC上潜在尘埃暴露的合适区域,并利用NASA火星侦察轨道器(MRO)卫星上的紧凑型火星侦察成像光谱仪(CRISM)的数据来检查暗区域的红外光谱,假设暗区域主要由尘埃颗粒组成,以确定它们的矿物组成,消除冰对亚像素尘埃特征的影响,并寻找指示多环芳烃(PAHs)的特征。光谱图已经确定了凹陷边缘之间的成分差异,大部分的SPRC和CRISM光谱已经被校正,以最大限度地减少二氧化碳冰的影响。虽然在CRISM仪器的探测范围内还没有发现多环芳烃的确凿证据,但凹陷边缘被证明比普通冰区的水分含量更高,在黑暗的尘土区域可能有碳酸镁的迹象。
We present our research on compositional mapping of the Martian South Polar Residual Cap (SPRC), especially the detection of organic signatures within the dust content of the ice, based on hyperspectral data analysis. The SPRC is the main region of interest for this investigation, because of the unique CO2ice sublimation features that cover the surface. These flat floored, circular depressions are highly dynamic, and we infer frequently expose dust particles previously trapped within the ice during the wintertime. Here we identify suitable regions for potential dust exposure on the SPRC, and utilise data from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) on board NASA's Mars Reconnaissance Orbiter (MRO) satellite to examine infrared spectra of dark regions assumed to be composed mainly of dust particles to establish their mineral composition, to eliminate the effects of ices on sub-pixel dusty features, and to look for signatures indicative of Polycyclic Aromatic Hydrocarbons (PAHs). Spectral mapping has identified compositional differences between depression rims and the majority of the SPRC and CRISM spectra have been corrected to minimise the influence of CO2ice. Whilst no conclusive evidence for PAHs has been found within the detectability limits of the CRISM instrument, depression rims are shown to have higher water content than regions of featureless ice, and there are possible indications of magnesium carbonate within the dark, dusty regions.
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