Measurement of high-temperature optical constants of solar-nebula minerals

太阳星云和其他原行星盘的模型旨在将我们关于早期太阳系的知识与对当今年轻恒星系统的天文观测联系起来，除了其他基本数据外，还需要这些系统的固体成分的光学常数。到目前为止，这样的数据主要存在于室温，有时也存在于低温。在这个项目中，我们打算测量温度在1100K以下的太阳星云矿物的光学常数和中红外光谱的温度依赖关系。在第三个资助期，我们将专注于类似于原始星际尘埃(无定形镁铁硅酸盐)的材料，并经历了由于受热而发生的不可逆转的结构变化。根据我们生产此类硅酸盐的经验，我们将研究它们的铁含量和其他参数对结构的影响，并测量产品的中红外光学性能。由此产生的数据将扩展我们的互联网数据库，其中包括与天体物理相关的矿物和固体的光学常数，通过这些数据库，矿物学家和天体物理学家将可以使用这些数据。

Models of the solar nebula and of other protoplanetary disks, which aim at linking our knowledge about the early solar system to astronomical observations of nowadays young stellar systems, require among other basic data the optical constants of the solid constituents of such systems. So far, such data exist mainly for room temperature, sometimes also for low temperatures. In this project, we intend to measure the temperature dependence of optical constants and mid-infrared spectra for solar-nebula minerals up to temperatures of 1100 K. In the 3rd funding period we will focus on materials being similar to the original interstellar dust (amorphous magnesium-iron silicates) and having experienced irreversible structural changes by exposure to heat. Based on our experience with the production of such silicates we will investigate the structural changes depending on their iron content and other parameters and will measure the mid-infrared optical properties of the products. The resulting data will extend our internet database of optical constants of astrophysical relevant minerals and solids, by which they will be available for mineralogists and astrophysicists.