The 2175 Å bump shows considerable variations in its strength, width, and central wavelength when observed along different sightlines in the Milky Way and other galaxies. These variations offer valuable insights into the composition, size distribution, and processing of interstellar dust grains along different sightlines. This paper introduces a mission concept called UVESS (Ultra Violet Extinction Sky Survey) aimed at exploring the composition of the interstellar medium (ISM) within both the Milky Way and nearby Local Group Galaxies by mapping the variation of UV extinction curve slopes and the 2175 Å feature across a majority of the sky to gain insights into the makeup of the ISM. Recent advancements in UV instrumentation and technologies pave the way for the development of high-throughput instruments in compact form factors. In this paper, we outline mission science goals and instrument concept tailored for a small satellite-based platform dedicated to the study of UV extinction.
High-resolution spectroscopy using spatial heterodyne spectrographs (SHS) offers exceptional performance and cost-effectiveness in the UV-Vis region for space missions. SHS instruments deliver high-resolution capabilities with larger etendues compared to similar instruments. This study presents a Python-based SHS model with a web interface for star selection, parameter generation, and 2D interferogram creation. The model also provides system optimization results and SNR values for aiding parameter selection. SHS proves to be a versatile and effective tool for numerous scientific applications, such as studying atomic and molecular emissions from comets, planetary atmospheres, Earth’s atmosphere, the Sun, and the interstellar medium (ISM).
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