与行星形成盘有关的水冰从无定形碳和硅酸盐颗粒表面的温度程序脱附
Temperature programed desorption of water ice from the surface of amorphous carbon and silicate grains as related to planet-forming disks
摘要：
了解小天体的历史和演化，如尘埃颗粒和彗星，在行星形成盘是非常重要的，以揭示负责创建行星系统的建筑规律。这些在盘的寒冷区域的小物体通常被认为是尘埃粒子与分子冰的混合物，其中冰覆盖在尘核的表面或实际上与尘埃物理混合。虽然第一种情况，冰与尘埃，近几十年来一直在实验室中进行深入研究，但第二种情况，冰与尘埃混合，目前还没有涉足。这项工作是第一个实验室研究的程序升温脱附（TPD）的水冰混合无定形碳和硅酸盐颗粒。我们表明，H2O冰的解吸动力学强烈依赖于灰尘/冰的质量比，可能是由于从一个大的表面的分形簇组成的碳或硅酸盐颗粒的水分子的解吸。此外，它表明，水冰分子是不同的结合到硅酸盐颗粒相比，碳。这些结果提供了小型宇宙天体的结构和形态与其中包含的水冰解吸动力学之间的联系。
英文摘要：
Understanding the history and evolution of small bodies, such as dust grains and comets, in planet-forming disks is very important to reveal the architectural laws responsible for the creation of planetary systems. These small bodies in cold regions of the disks are typically considered as mixtures of dust particles with molecular ices, where ices cover the surface of a dust core or are actually physically mixed with dust. Whilst the first case, ice-on-dust, has been intensively studied in the laboratory in recent decades, the second case, ice-mixed-with-dust, present uncharted territory. This work is the first laboratory study of the temperature-programmed desorption (TPD) of water ice mixed with amorphous carbon and silicate grains. We show that the kinetics of desorption of H2O ice depends strongly on the dust/ice mass ratio, probably, due to the desorption of water molecules from a large surface of fractal clusters composed of carbon or silicate grains. In addition, it is shown that water ice molecules are differently bound to silicate grains in contrast to carbon. The results provide a link between the structure and morphology of small cosmic bodies and the kinetics of desorption of water ice included in them.
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