On-sky tests of an upgraded holographic mask in the OSIRIS imager

Eric Exley; Steph Sallum; Peyton Benac; David Doelman; Michael Fitzgerald; Michael C. Liu; Jim Lyke; Frans Snik; Peter Tuthill; Joost Wardenier; Peter Wizinowich

doi:10.1117/12.3029442

18 September 2024 On-sky tests of an upgraded holographic mask in the OSIRIS imager

Eric Exley, Steph Sallum, Peyton Benac, David Doelman, Michael Fitzgerald, Michael C. Liu, Jim Lyke, Frans Snik, Peter Tuthill, Joost Wardenier, Peter Wizinowich

Author Affiliations +

Proceedings Volume 13095, Optical and Infrared Interferometry and Imaging IX; 130952U (2024) https://doi.org/10.1117/12.3029442
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Holographic aperture masking (HAM) is an imaging technique in which a conventional telescope pupil is made into an interferometric array by means of a diffractive liquid-crystal phase mask. HAM allows for angular resolution that approaches and goes within the classical diffraction limit, while simultaneously increasing the throughput on the detector compared to traditional SAM, which uses a simple transmissive pupil plane mask. HAM creates interference fringes that provide phase and power information for each pair of holes in the mask, making the technique especially useful for the detection of close-in asymmetric structures surrounding stars, such as stellar or planetary companions, or protoplanetary disks. We present on-sky tests of an upgraded HAM mask installed in the Keck I OSIRIS imager. Observations were taken at J-band (1.28μm) of the known binary HD 44927 and single star HD 13249, the latter being used as a reference for calibration of instrumental errors. Using the SAMpy data reduction pipeline and modifying it for the Keck I HAM mask, Fourier observables were extracted and analyzed. We constrained astrometric and photometric measurements of the HD 44927 companion relative to its host star using a grid-fit companion model, producing orbital parameters to compare to previous measurements made with other interferometric imaging techniques.

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Eric Exley, Steph Sallum, Peyton Benac, David Doelman, Michael Fitzgerald, Michael C. Liu, Jim Lyke, Frans Snik, Peter Tuthill, Joost Wardenier, and Peter Wizinowich "On-sky tests of an upgraded holographic mask in the OSIRIS imager", Proc. SPIE 13095, Optical and Infrared Interferometry and Imaging IX, 130952U (18 September 2024); https://doi.org/10.1117/12.3029442

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