Thermal annealing of silicates in protoplanetary disks - Laboratory data and modelling

原行星盘中硅酸盐的热退火 - 实验室数据和建模

• 批准号: 35019925
• 负责人: Professorin Dr. Dominique Lattard
• 金额: --
• 依托单位: Fakultät für Chemie und Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/35019925?language=en
• 关键词: Thermal; annealing; silicates; protoplanetary; disks

This project aims at obtaining reliable laboratory data on the physico-chemical processes taking place during thermal annealing of silicate minerals. These data are urgently needed for a consistent astrophysical modelling. The degree of crystallinity is of utmost importance for the opacity, radiative transfer and thermal structure of protoplanetary disks. A variety of minerals - particularly the cosmochemically abundant Mg-rich silicates of the olivine and pyroxene groups - have been observed via infrared spectroscopy of protoplanetary disks and comets. In this project, thermal annealing of these silicates will be traced in the laboratory by infrared spectroscopy of heated amorphous materials. The infrared results will be correlated with those of other methods (e.g. X-ray diffractometry and transmission electron microscopy) to better define the degree of crystallinity as a function of time and annealing temperature. Numerical techniques and ab initio calculations will be used to model the crystallisation process and simulate the evolution of infrared spectra during this process.

该项目旨在获得关于硅酸盐矿物热退火过程中发生的物理化学过程的可靠实验室数据。迫切需要这些数据来进行一致的天体物理建模。结晶度对原行星盘的不透明度、辐射传递和热结构至关重要。通过对原行星盘和彗星的红外光谱分析，已经观察到了多种矿物，特别是橄榄石和辉石类的富含镁的硅酸盐。在这个项目中，这些硅酸盐的热退火将在实验室中通过加热的无定形材料的红外光谱来跟踪。红外结果将与其他方法（例如X射线衍射法和透射电子显微镜）的结果相关联，以更好地定义结晶度作为时间和退火温度的函数。数值技术和从头计算将被用来模拟结晶过程，并模拟在此过程中的红外光谱的演变。