Differential speckle polarimetry with SCExAO VAMPIRES

Boris Safonov; Maxwell Millar-Blanchaer; Manxuan Zhang; Barnaby R. Norris; Olivier Guyon; Julien Lozi; Stephanie Sallum

doi:10.1117/12.2630440

26 August 2022 Differential speckle polarimetry with SCExAO VAMPIRES

Boris Safonov, Maxwell Millar-Blanchaer, Manxuan Zhang, Barnaby R. Norris, Olivier Guyon, Julien Lozi, Stephanie Sallum

Proceedings Volume 12183, Optical and Infrared Interferometry and Imaging VIII; 121832C (2022) https://doi.org/10.1117/12.2630440
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

The differential polarization visibilities R_Q and R_U of an object are the ratios of its visibilities corresponding to orthogonal polarizations, the interferometric analogs to Stokes Q and U intensity images. The measurement of differential polarization visibilitites can be used e.g. for constraining inner parts of circumstellar envelopes of young or evolved stars at the diffraction limited resolution of the feeding telescope. Here we demonstrate the estimation of both amplitude and phase of R_Q and R_U from data obtained using SCExAO VAMPIRES through the full pupil of the 8-m Subaru telescope using the Differential Speckle Polarimetry technique. The correction for biases arising due to instrumental polarization effects is discussed. The accuracy of R_Q, R_U measurement with VAMPIRES is limited by imperfect knowledge of instrumental polarization and amounts to 5 x 10^-3.

Citation Download Citation

Boris Safonov, Maxwell Millar-Blanchaer, Manxuan Zhang, Barnaby R. Norris, Olivier Guyon, Julien Lozi, and Stephanie Sallum "Differential speckle polarimetry with SCExAO VAMPIRES", Proc. SPIE 12183, Optical and Infrared Interferometry and Imaging VIII, 121832C (26 August 2022); https://doi.org/10.1117/12.2630440

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KEYWORDS

Polarization

Modulation

Polarimetry

Adaptive optics

Telescopes

Photons

Cameras

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