Planetary system and star formation science with non-redundant masking on JWST

Physics – Optics

Scientific paper

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Scientific paper

Non-redundant masking (NRM) is a high contrast high resolution technique that is relevant for future space missions dedicated to either general astrophysics or extrasolar planetary astronomy. NRM mitigates not only atmospheric but instrument-induced speckle noise as well. The recently added mask in the Fine Guidance Sensor Tunable Filter Imager (FGS-TFI) on the James Webb Space Telescope (JWST) will open up a search space between 50 and 400 mas at wavelengths longer than 3.8um. Contrast of 1e4 will be achievable in a 10 ks exposure of an M=7 star, with routine observing, target acquisition, and data calibration methods. NRM places protoplanets in Taurus as well as Jovians younger than 300Myr and more massive than 2 Jupiter masses orbiting solar type stars within JWST's reach. Stars as bright as M=3 will also be observable, thus meshing well with next-generation ground-based extreme adaptive optics coronagraphs.

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