Multispectral image reconstruction of faint circumstellar environments from high contrast angular spectral differential imaging (ASDI) data

Olivier Flasseur; Samuel Thé; Loïc Denis; Éric Thiébaut; Maud Langlois

doi:10.1117/12.2630362

29 August 2022 Multispectral image reconstruction of faint circumstellar environments from high contrast angular spectral differential imaging (ASDI) data

Olivier Flasseur, Samuel Thé, Loïc Denis, Éric Thiébaut, Maud Langlois

Author Affiliations +

Proceedings Volume 12185, Adaptive Optics Systems VIII; 121853U (2022) https://doi.org/10.1117/12.2630362
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

We recently proposed REXPACO, an algorithm for imaging circumstellar environments from high-contrast angular differential imaging (ADI) data. In the context of high-contrast imaging where the signal of interest is largely dominated by a nuisance term due to the stellar light leakages and the noise, our algorithm amounts to jointly estimating the object of interest and the statistics (mean and covariance matrix) of the nuisance component. In this contribution, we first extend the REXPACO algorithm by refining the statistical model of the nuisance component it embeds. Capitalizing on the improved robustness of this new method named robust REXPACO, we then show how it can be modified to deal with angular plus spectral differential imaging (ASDI) datasets. We apply our methods on several ADI and ASDI datasets from the IRDIS and IFS imagers of the VLT/SPHERE instrument and we show that the proposed algorithms significantly reduce the typical artifacts produced by state-of-the-art algorithms. By also taking into account the instrumental point spread function (PSF), our algorithms yield a deblurred estimate of the object of interest without the artifacts observed with other methods.

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Olivier Flasseur, Samuel Thé, Loïc Denis, Éric Thiébaut, and Maud Langlois "Multispectral image reconstruction of faint circumstellar environments from high contrast angular spectral differential imaging (ASDI) data", Proc. SPIE 12185, Adaptive Optics Systems VIII, 121853U (29 August 2022); https://doi.org/10.1117/12.2630362

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