Send to

Choose Destination
See comment in PubMed Commons below
J Opt Soc Am A Opt Image Sci Vis. 2010 Nov 1;27(11):A157-70.

Analytical expression of long-exposure adaptive-optics-corrected coronagraphic image. First application to exoplanet detection.

Author information

  • 1Office National d'Etudes et de Recherches Aérospatiales, Département d'optique théorique et appliquée, 29 avenue de la division Leclerc, F-92322 Châtillon, France.


In this paper we derive an analytical model of a long-exposure star image for an adaptive-optics(AO)-corrected coronagraphic imaging system. This expression accounts for static aberrations upstream and downstream of the coronagraphic mask as well as turbulence residuals. It is based on the perfect coronagraph model. The analytical model is validated by means of simulations using the design and parameters of the SPHERE instrument. The analytical model is also compared to a simulated four-quadrant phase-mask coronagraph. Then, its sensitivity to a miscalibration of structure function and upstream static aberrations is studied, and the impact on exoplanet detectability is quantified. Last, a first inversion method is presented for a simulation case using a single monochromatic image with no reference. The obtained result shows a planet detectability increase by two orders of magnitude with respect to the raw image. This analytical model presents numerous potential applications in coronographic imaging, such as exoplanet direct detection, and circumstellar disk observation.

PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Optical Society of America
    Loading ...
    Support Center