On-sky observations with an achromatic hybrid phase knife coronagraph in the visible
Lyu Abe (LUAN), Mathilde Beaulieu (LUAN), Farrokh Vakili (LUAN), Jean, Gay (LG), Jean-Pierre Rivet (OCA), Sebastien Dervaux (LG), Armando Domiciano, De Souza (LUAN, LG)

TL;DR
This paper reports on the development and on-sky testing of an achromatic hybrid phase knife coronagraph in the visible spectrum, demonstrating its potential for high-contrast imaging and exoplanet detection despite challenging conditions.
Contribution
It introduces a novel achromatic hybrid phase knife coronagraph derived from the four-quadrant phase mask, with a real-time image selection algorithm tested on on-sky data.
Findings
Proven efficiency of the coronagraph under poor observing conditions
Development of procedures for future adaptive optics and coronagraphic instruments
Successful on-sky demonstration with binary star HD80081
Abstract
CONTEXT: The four-quadrant phase mask stellar coronagraph, introduced by D. Rouan et al., is capable of achieving very high dynamical range imaging and was studied in the context of the direct detection of extra-solar planets. Achromatic four-quadrant phase mask is currently being developed for broadband IR applications. AIMS: We report on laboratory and on-sky tests of a prototype coronagraph in the visible. This prototype, the achromatic hybrid phase knife coronagraph, was derived from the four-quadrant phase mask principle. METHODS: The instrumental setup implementing the coronagraph itself was designed to record the pre- and post-coronagraphic images simultaneously so that an efficient real-time image selection procedure can be performed. We describe the coronagraph and the associated tools that enable robust and repeatable observations. We present an algorithm of image selection…
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