FALCO simulations of high-contrast polarimetry with the Nancy Grace Roman Space Telescope coronagraph instrument

David S. Doelman; Hanae Belaouchi; A.J. Riggs; Bertrand Mennesson; Mireille Ouellet; Rob G. van Holstein; Jeroen Rietjens; Henk Hoevers; Frans Snik

doi:10.1117/12.2677450

5 October 2023 FALCO simulations of high-contrast polarimetry with the Nancy Grace Roman Space Telescope coronagraph instrument

David S. Doelman, Hanae Belaouchi, A.J. Riggs, Bertrand Mennesson, Mireille Ouellet, Rob G. van Holstein, Jeroen Rietjens, Henk Hoevers, Frans Snik

Author Affiliations +

Proceedings Volume 12680, Techniques and Instrumentation for Detection of Exoplanets XI; 126800V (2023) https://doi.org/10.1117/12.2677450
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

The Coronagraph Instrument of the Nancy Grace Roman Space Telescope (Roman Coronagraph) will be capable of both total intensity and polarization measurements of circumstellar disks. The polarimetric performance is impacted by polarization effects introduced by all mirrors before the Wollaston prisms. In this paper, we aim to characterize these effects for the Roman Coronagraph in bands one and four using the FALCO and PROPER packages. We simulate the effect of polarization aberrations that impact the polarimetric contrast and the instrumental polarization effects to study the polarimetric accuracy. We include spacecraft rolls but leave out systematic camera noise. We find that Polarimetric Differential Imaging (PDI) improves the contrast by a factor of six. The PDI contrast of ∼ 8 × 10⁻¹¹ is limited by polarized speckles from instrumental polarization effects and polarization aberrations. By injecting polarized companions with at various contrast levels and demodulating their polarimetric signal, we recover their source Stokes vector within 2%.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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David S. Doelman, Hanae Belaouchi, A.J. Riggs, Bertrand Mennesson, Mireille Ouellet, Rob G. van Holstein, Jeroen Rietjens, Henk Hoevers, and Frans Snik "FALCO simulations of high-contrast polarimetry with the Nancy Grace Roman Space Telescope coronagraph instrument", Proc. SPIE 12680, Techniques and Instrumentation for Detection of Exoplanets XI, 126800V (5 October 2023); https://doi.org/10.1117/12.2677450

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