Blind and robust reconstruction of adaptive optics point spread functions for asteroid deconvolution and moon detection

Anthony Berdeu; Ferréol Soulez; Kate Minker; Benoit Carry; Guillaume Bourdarot; Antoine Kaszczyc; Maud Langlois

doi:10.1117/12.3019874

27 August 2024 Blind and robust reconstruction of adaptive optics point spread functions for asteroid deconvolution and moon detection

Anthony Berdeu, Ferréol Soulez, Kate Minker, Benoit Carry, Guillaume Bourdarot, Antoine Kaszczyc, Maud Langlois

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130977E (2024) https://doi.org/10.1117/12.3019874
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Initially designed to detect and characterize exoplanets, extreme adaptive optics systems (AO) open a new window on the solar system by resolving its small bodies. Nonetheless, despite the always increasing performances of AO systems, the correction is not perfect, degrading their image and producing a bright halo that can hide faint and close moons. Using a reference point spread function (PSF) is not always sufficient due to the random nature of the turbulence. In this work, we present our method to overcome this limitation. It blindly reconstructs the AO-PSF directly in the data of interest, without any prior on the instrument nor the asteroid’s shape. This is done by first estimating the PSF core parameters under the assumption of a sharp-edge and flat object, allowing the image of the main body to be deconvolved. Then, the PSF faint extensions are reconstructed with a robust penalization optimization, discarding outliers on-the-fly such as cosmic rays, defective pixels and moons. This allows to properly model and remove the asteroid’s halo. Finally, moons can be detected in the residuals, using the reconstructed PSF and the knowledge of the outliers learned with the robust method. We show that our method can be easily applied to different instruments (VLT/SPHERE, Keck/NIRC2), efficiently retrieving the features of AO-PSFs. Compared with state-of-the-art moon enhancement algorithms, moon signal is greatly improved and our robust detection method manages to discriminate faint moons from outliers.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Anthony Berdeu, Ferréol Soulez, Kate Minker, Benoit Carry, Guillaume Bourdarot, Antoine Kaszczyc, and Maud Langlois "Blind and robust reconstruction of adaptive optics point spread functions for asteroid deconvolution and moon detection", Proc. SPIE 13097, Adaptive Optics Systems IX, 130977E (27 August 2024); https://doi.org/10.1117/12.3019874

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