Pré-Publication, Document De Travail Année : 2021

High contrast imaging wavefront sensor referencing from coronagraphic images

Olivier Guyon
Anthony Boccaletti
  • Fonction : Auteur
Vincent Deo
Sebastien Vievard
Julien Lozi
Kyohoon Ahn
  • Fonction : Auteur
Barnaby Norris
  • Fonction : Auteur
Thayne Currie
Eric Gendron
Arielle Bertrou-Cantou
  • Fonction : Auteur
  • PersonId : 1216716
  • IdRef : 267023227
Florian Ferreira
Arnaud Sevin
  • Fonction : Auteur
Fabrice Vidal
  • Fonction : Auteur
  • PersonId : 1337529

Résumé

A key challenge of high contrast imaging (HCI) is to differentiate a speckle from an exoplanet signal. The sources of speckles are a combination of atmospheric residuals and aberrations in the non-common path. Those non-common path aberrations (NCPA) are particularly challenging to compensate for as they are not directly measured, and because they include static, quasi-static and dynamic components. The proposed method directly addresses the challenge of compensating the NCPA. The algorithm DrWHO - Direct Reinforcement Wavefront Heuristic Optimisation - is a quasi-real-time compensation of static and dynamic NCPA for boosting image contrast. It is an image-based lucky imaging approach, aimed at finding and continuously updating the ideal reference of the wavefront sensor (WFS) that includes the NCPA, and updating this new reference to the WFS. Doing so changes the point of convergence of the AO loop. We show here the first results of a post-coronagraphic application of DrWHO. DrWHO does not rely on any model nor requires accurate wavefront sensor calibration, and is applicable to non-linear wavefront sensing situations. We present on-sky performances using a pyramid WFS sensor with the Subaru coronagraph extreme AO (SCExAO) instrument.

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Dates et versions

hal-03445132 , version 1 (24-11-2021)

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Nour Skaf, Olivier Guyon, Anthony Boccaletti, Vincent Deo, Sebastien Vievard, et al.. High contrast imaging wavefront sensor referencing from coronagraphic images. 2021. ⟨hal-03445132⟩
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