28 June 2006 Post processing of differential images for direct extrasolar planet detection from the ground
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Abstract
The direct imaging from the ground of extrasolar planets has become today a major astronomical and biological focus. This kind of imaging requires simultaneously the use of a dedicated high performance Adaptive Optics [AO] system and a differential imaging camera in order to cancel out the flux coming from the star. In addition, the use of sophisticated post-processing techniques is mandatory to achieve the ultimate detection performance required. In the framework of the SPHERE project, we present here the development of a new technique, based on Maximum A Posteriori [MAP] approach, able to estimate parameters of a faint companion in the vicinity of a bright star, using the multi-wavelength images, the AO closed-loop data as well as some knowledge on non-common path and differential aberrations. Simulation results show a 10-5 detectivity at 5σ for angular separation around 15λ/D with only two images.
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J.-F. Sauvage, J.-F. Sauvage, L. Mugnier, L. Mugnier, T. Fusco, T. Fusco, G. Rousset, G. Rousset, } "Post processing of differential images for direct extrasolar planet detection from the ground", Proc. SPIE 6272, Advances in Adaptive Optics II, 62722B (28 June 2006); doi: 10.1117/12.671470; https://doi.org/10.1117/12.671470
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