Evolution of Morphological and Physical Properties of Laboratory Interstellar Organic Residues with Ultraviolet Irradiation
Evolution of Morphological and Physical Properties of Laboratory Interstellar Organic Residues with Ultraviolet Irradiation
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DOI：
10.3847/1538-4357/aa5ca6
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发表时间：
2017-03-01
影响因子：
4.9
通讯作者：
Kouchi, A.
中科院分区：
文献类型：
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作者：
Piani, L.;Tachibana, S.;Kouchi, A.
分子云中形成的难熔有机化合物是太阳系天体的组成部分，可能是原始陨石和彗星材料中发现的有机物的前体。然而，人们对分子云有机物从致密分子云到行星系统的演化途径知之甚少。在这项研究中，我们重点研究分子云难熔有机物的形态和粘弹性特性的演变。我们发现，在大约 10 K 的温度下由紫外线照射的 H2O-CH3OH-NH3 冰实验合成的有机残留物，在室温下紫外线照射后，其纳米至微米级的形貌和粘弹性能发生显着变化。这种照射的剂量相当于在弥漫云中短暂停留后所经历的剂量（
Refractory organic compounds formed in molecular clouds are among the building blocks of the solar system objects and could be the precursors of organic matter found in primitive meteorites and cometary materials. However, little is known about the evolutionary pathways of molecular cloud organics from dense molecular clouds to planetary systems. In this study, we focus on the evolution of the morphological and viscoelastic properties of molecular cloud refractory organic matter. We found that the organic residue, experimentally synthesized at similar to 10 K from UV-irradiated H2O-CH3OH-NH3 ice, changed significantly in terms of its nanometer to micrometer-scale morphology and viscoelastic properties after UV irradiation at room temperature. The dose of this irradiation was equivalent to that experienced after short residence in diffuse clouds (