Coherent differential imaging: squeezing additional imaging contrast behind the self-coherent camera on SPIDERS

Christopher R. Mann; Christian Marois; William Thompson; Olivier Lardière; Jean-Pierre Véran

doi:10.1117/12.3019248

27 August 2024 Coherent differential imaging: squeezing additional imaging contrast behind the self-coherent camera on SPIDERS

Christopher R. Mann, Christian Marois, William Thompson, Olivier Lardière, Jean-Pierre Véran

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130977H (2024) https://doi.org/10.1117/12.3019248
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Coherent Differential Imaging (CDI) is a very promising post-processing technique for imaging faint planets and disks with a self-coherent camera (SCC). The SCC we have built in the Subaru Pathfinder Instrument for Detecting Exoplanets and Recovering Spectra (SPIDERS) employs common path interferometry to distinguish coherent starlight from incoherent planet/disk light. Using closed-loop real-time correction, the SCC greatly improves the achievable imaging contrast. The CDI technique is applied during image post-processing to further remove residual speckle artifacts that were not fully corrected by the SSC loop, deepening the imaging contrast. In this proceeding we describe the procedures developed to carry out CDI corrections, as well as the technical challenges encountered and solutions implemented along the way. The main findings thus far are that chromatic blurring of fringes is causing the strongest limitations on our CDI speckle removal. Chromatic amplitude corrections to the constructed reference image show improvement, but more in-depth modelling or deconvolution of blurring effects are needed. Our CDI recipe produces a factor of ∼15× improvement in the core of the PSF. We expect to push this improvement to 20 to 30× with more advanced chromatic treatment, and extend the improvement to wider separations.

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

Citation Download Citation

Christopher R. Mann, Christian Marois, William Thompson, Olivier Lardière, and Jean-Pierre Véran "Coherent differential imaging: squeezing additional imaging contrast behind the self-coherent camera on SPIDERS", Proc. SPIE 13097, Adaptive Optics Systems IX, 130977H (27 August 2024); https://doi.org/10.1117/12.3019248

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