Approximate analytical expression for AO-corrected coronagraphic imaging in preparation of exoplanet signal extraction

Details Approximate analytical expression for AO-corrected coronagraphic imaging in preparation of exoplanet signal extraction Approximate analytical expression for AO-corrected coronagraphic imaging in preparation of exoplanet signal extraction

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sf2a.conf...97y&link_type=abstract

SF2A-2010: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics. Eds.: S. Boissier, M. Heydari-

Astronomy and Astrophysics

Astrophysics

Exoplanets, Direct Detection, Multispectral Deconvolution, Inverse Problems, Instrumentation, Sphere, Ifs

Scientific paper

The next step in the field of extrasolar planets imaging is on the verge of being reached with instruments such as SPHERE (Spectro Polarimetric High contrast Exoplanet REsearch), which will be capable of performing at the same time direct detection and spectral characterization thanks to integral field spectrograph (IFS) images. In these multispectral images, the star is not completely cancelled by the AO-corrected coronagraphic system because of residual aberrations of the latter. In particular, the star image comprises quasi-static speckles that must be disentangled from the planet signal in order to get the sought information: is there a planet, where is it and what is its spectrum? We are developing a specific image post-processing method using a Bayesian inverse problem approach. The essential required building block of such a method is a data model (often called "direct model") with a minimal number of unknown parameters. In the framework of the SPHERE project for the VLT, we propose an approximate analytical direct model of a long-exposure star image for an AO-corrected coronagraphic imaging system and we present some preliminary numerical simulations to validate this model.

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