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The Colorado Ultraviolet Transit Experiment (CUTE) is a near-UV (2550 - 3300Angstrom) 6U cubesat mission designed to monitor transiting hot Jupiters toquantify their atmospheric mass loss and magnetic fields. CUTE will probe bothatomic (Mg and Fe) and molecular (OH) lines for evidence of enhanced transitabsorption, and to search for evidence of early ingress due to bow shocks aheadof the planet's orbital motion. As a dedicated mission, CUTE will observe morethan 100 spectroscopic transits of hot Jupiters over a nominal seven monthmission. This represents the equivalent of more than 700 orbits of the onlyother instrument capable of these measurements, the Hubble Space Telescope.CUTE efficiently utilizes the available cubesat volume by means of aninnovative optical design to achieve a projected effective area of 28 sq. cm,low instrumental background, and a spectral resolving power of 3000 over theprimary science bandpass. These performance characteristics enable CUTE todiscern transit depths between 0.1 - 1% in individual spectral absorptionlines. We present the CUTE optical and mechanical design, a summary of thescience motivation and expected results, and an overview of the projectedfabrication, calibration and launch timeline.

The Colorado Ultraviolet Transit Experiment (CUTE): A dedicated cubesat mission to study exoplanetary mass loss and magnetic fields