20 October 2004 VIDA, a hypertelescope on the VLTI: last instrument design studies and performance analysis
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Abstract
According to the "hypertelescope" imaging mode, stellar interferometers could provide direct snapshot images. Whereas the Fizeau imaging mode is useless when the aperture is highly diluted, a "densified-pupil" or "hypertelescope" imaging mode can concentrate most light into the high-resolution central interference peak, allowing direct imaging of compact sources and stellar coronagraphy for exoplanets finding. The current VLTI is able to combine light from 2 to 3 telescopes coherently, but the combination of 4 to 8 beams is foreseen in subsequent phases. In order to exploit the full forthcoming VLTI infrastructure, a next generation instrument has been proposed (VIDA) in 2002 for very high-resolution snapshot imaging with UTs and/or ATs. This paper presents a new attractive design studied for this instrument using single mode optical fibers and allowing a multi-field imaging mode. We also give the expected performances with a coronagraph, computed from numerical simulations including cophasing and adaptive optics residual errors.
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Olivier Lardiere, Denis Mourard, Fabien Patru, Marcel Carbillet, "VIDA, a hypertelescope on the VLTI: last instrument design studies and performance analysis", Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004); doi: 10.1117/12.550411; https://doi.org/10.1117/12.550411
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