Bulk abundances of exo-planetesimals

该项目的目标是通过对白矮星的光学和紫外光谱分析来测量外行星子的总体丰度，这些分析显示了行星碎片对光球的污染。该项目将使用来自DESI、SDSS-V和WEAVE调查的数据来确定合适的系统，并在必要时获得后续光谱。分析将包括使用最先进的大气代码计算模型大气和合成光谱。由此产生的丰度将被汇集到一个数据库中，然后用于进行统计分析，最终目标是评估太阳系的组成是否具有典型性，以及是否存在一些表现出奇特组成的行星系统。

The goal of this project is to measure the bulk abundances of exo-planetesimals from the analysis of optical and ultraviolet spectroscopy of white dwarfs that show photospheric contamination by planetary debris. The project will use data from the DESI, SDSS-V and WEAVE surveys to identify suitable systems, and, where necessary obtain follow-up spectroscopy. The analysis will involve computing model atmospheres and synthetic spectra using a state-of-the-art atmosphere code. The resulting abundances will be assembled into a data base, which will then serve to carry out a statistical analysis, and the ultimate objective is to assess if the solar system is typical in its composition, and if there some planetary systems that exhibit an exotic make-up.