AIMÉ , C.

This paper presents numerical illustrations of the effects of clipping of photoevents in speckle interferometry and speckle masking. The clipping is due to a saturation of the photon-counting detectors that cannot count more than one photon per pixel, causing the image to be composed of "0" and "1". The theoretical basis for this study has been...

Context. This study is made in the context of the future solar coronagraph ASPIICS of the ESA formation-flying mission Proba-3. Aims. In the context of solar coronagraphy, we provide a comparative study of the theoretical performance of serrated (or toothed) external occulters by varying the number and size of the teeth, which we compare to the...

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International audience

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International audience

We present in this paper a technique for imaging binary stars from speckle data. This technique is based upon the computation of the cross-correlation between the speckle frames and their square. This may be considered as a simple, easy to implement, complementary computation to the autocorrelation function of Labeyrie's technique for a rapid...