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The idea behind FIRST (Fibered Imager foR a Single Telescope) is to usesingle-mode fibers to combine multiple apertures in a pupil plane as such as tosynthesize a bigger aperture. The advantages with respect to a pure imager arei) relaxed tolerance on the pointing and cophasing, ii) higher accuracy inphase measurement, and iii) availability of compact, precise, and activesingle-mode optics like Lithium Niobate. The latter point being a huge asset inthe context of a space mission. One of the problems of DARWIN or SIM-likeprojects was the difficulty to find low cost pathfinders missions. But the factthat Lithium Niobate optic is small and compact makes it easy to test throughsmall nanosats missions. Moreover, they are commonly used in the telecomindustry, and have already been tested on communication satellites. The idea ofthe FIRST-S demonstrator is to spatialize a 3U CubeSat with a Lithium Niobatenulling interferometer. The technical challenges of the project are: startracking, beam combination, and nulling capabilities. The optical baseline ofthe interferometer would be 30 cm, giving a 2.2 AU spatial resolution atdistance of 10 pc. The scientific objective of this mission would be to studythe visible emission of exozodiacal light in the habitable zone around theclosest stars.

CubeSats as pathfinders for planetary detection: the FIRST-S satellite