15 September 2011 The Subaru coronagraphic extreme AO (SCExAO) system: fast visible imager
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Abstract
The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system is an instrument designed to be inserted between the Subaru AO188 system and the infrared HiCIAO camera in order to greatly improve the contrast in the very close (less than 0.5") neighbourhood of stars.Next to the infrared coronagraphic path, a visible scientific path, based on a EMCCD camera, has been implemented. Benefiting from both AO correction and new data processing techniques, it is a powerful tool for high angular resolution imaging and opens numerous new science opportunities. A factor 2 to 3 in Strehl ratio is obtained compared to the AO long exposure time: up to 25% Strehl in the 650nm wavelength, depending on the image processing algorithm used and the seeing conditions. The system is able to deliver diffraction limited images at 650 nm (17 mas FWHM). Our baseline image processing algorithm is based on the selection of the best signal for each spatial frequency. We demonstrate that this approach offers significantly better results than the classical select, shift and add approach (lucky imaging).
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Vincent Garrel, Vincent Garrel, Olivier Guyon, Olivier Guyon, Pierre Baudoz, Pierre Baudoz, Frantz Martinache, Frantz Martinache, Paul Stewart, Paul Stewart, Julien Lozi, Julien Lozi, Tyler Groff, Tyler Groff, } "The Subaru coronagraphic extreme AO (SCExAO) system: fast visible imager", Proc. SPIE 8151, Techniques and Instrumentation for Detection of Exoplanets V, 81510R (15 September 2011); doi: 10.1117/12.894309; https://doi.org/10.1117/12.894309
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