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A. Boccaletti (GPS - CalTech)
In the past few years, several coronagraphic device have been proposed to perform high contrast imaging of stellar environment, the ultimate goal being exo-planets detection. Such ambitious programs require both a high angular resolution and a high contrast capability. The typical brightness ratio of a planet like Jupiter is about 109 with respect to its parent star (at both visible and near IR wavelengths) and is angularly separated by 0.5'' if the system is located at 10pc. The performance achieve routinely on ground-based and space-based current instruments is well below this requirement. For this reason, we have investigate phase-mask coronagraphic technique and we present some result of numerical simulations. Although this technique appears promising to cancel the on-axis bright star, the speckle noise arising from phase residuals severely limits the performance of coronagraphs. We are therefore also interested in additional technics to get rid of the speckle noise at close angular distances. Simulations and first results are presented.
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