SOWAT: Speckle Observations With Alleviated Turbulence

Abstract

Adaptive optics (AO) systems and image reconstruction algorithms are indispensable tools when it comes to high-precision astrometry. In this paper, we analyze the potential of combining both techniques, i.e. by applying image reconstruction on partially AO corrected short exposures. Therefore we simulate speckle clouds with and without AO corrections and create synthetic observations. We apply holographic image reconstruction to the obtained observations and find that (i) the residual wavefronts decorrelate slowlier and to a lower limit when AO systems are used, (ii) the same reference stars yield a better reconstruction, and (iii) using fainter reference stars we achieve a similar image quality. These results suggest that holographic imaging of speckle observations is feasible with 2-3 times longer integration times and 3mag fainter reference stars, to obtain diffraction-limited imaging from low-order AO systems that are less restricted in sky-coverage than typical high-order AO systems.

arXiv comment18 pages, 13 figures, and 3 tables

References in corpus (10)

• Astropy: A Community Python Package for Astronomy
• Lucky Imaging: High Angular Resolution Imaging in the Visible from the Ground
• Gemini multi-conjugate adaptive optics system review I: Design, trade-offs and integration
• Gemini multi-conjugate adaptive optics system review II: Commissioning, operation and overall performance
• GALACTICNUCLEUS: A high angular resolution $JH{K}_s$ imaging survey of the Galactic Centre. I. Methodology, performance, and near-infrared extinction towards the Galactic Centre
• Getting Lucky with Adaptive Optics: Fast AO Image Selection in the Visible with a Large Telescope
• Holographic Imaging of Crowded Fields: High Angular Resolution Imaging with Excellent Quality at Very Low Cost
• High spatial resolution optical imaging of the multiple T Tauri system LkHα 262/LkHα 263
• The GRAVITY Coudé Infrared Adaptive Optics (CIAO) system for the VLT Interferometer
• The adaptive optics lucky imager (AOLI): presentation, commissioning, and AIV innovations

Cited by in corpus (1)

• High Resolution Imaging in the Visible with Faint Reference Stars on Large Ground-Based Telescopes