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UV-SCOPE is a mission concept to determine the causes of atmospheric massloss in exoplanets, investigate the mechanisms driving aerosol formation in hotJupiters, and study the influence of the stellar environment on atmosphericevolution and habitability. As part of these investigations, the mission willgenerate a broad-purpose legacy database of time-domain ultraviolet (UV)spectra for nearly 200 stars and planets.  The observatory consists of a 60 cm, f/10 telescope paired to a long-slitspectrograph, yielding simultaneous, almost continuous coverage between 1203{\AA} and 4000 {\AA}, with resolutions ranging from 6000 to 240. The efficientinstrument provides throughputs > 4% (far-UV; FUV) and > 15% (near-UV; NUV),comparable to HST/COS and much better than HST/STIS, over the same spectralrange. A key design feature is the LiF prism, which serves as a dispersiveelement and provides high throughput even after accounting for radiationdegradation. The use of two delta-doped Electron-Multiplying CCD detectors withUV-optimized, single-layer anti-reflection coatings provides high quantumefficiency and low detector noise. From the Earth-Sun second Lagrangian point,UV-SCOPE will continuously observe planetary transits and stellar variabilityin the full FUV-to-NUV range, with negligible astrophysical background.  All these features make UV-SCOPE the ideal instrument to study exoplanetaryatmospheres and the impact of host stars on their planets. UV-SCOPE wasproposed to NASA as a Medium Explorer (MidEx) mission for the 2021 Announcementof Opportunity. If approved, the observatory will be developed over a 5-yearperiod. Its primary science mission takes 34 months to complete. The spacecraftcarries enough fuel for 6 years of operations.

The UV-SCOPE Mission: Ultraviolet Spectroscopic Characterization Of Planets and their Environments