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9 August 2016 GPI observational calibrations XIV: polarimetric contrasts and new data reduction techniques
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The Gemini Planet Imager (GPI) has been designed for the direct detection and characterization of exoplanets and circumstellar disks. GPI is equipped with a dual channel polarimetry mode designed to take advantage of the inherently polarized light scattered off circumstellar material to further suppress the residual seeing haloleft uncorrected by the adaptive optics. We explore how recent advances in data reduction techniques reduce systematics and improve the achievable contrast in polarimetry mode. In particular, we consider different flux extraction techniques when constructing datacubes from raw data, division by a polarized at-field and a method for subtracting instrumental polarization. Using observations of unpolarized standard stars we find that GPI's instrumental polarization is consistent with being wavelength independent within our errors. In addition, we provide polarimetry contrast curves that demonstrate typical performance throughout the GPIES campaign.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Maxwell A. Millar-Blanchaer, Marshall D. Perrin, Li-Wei Hung, Michael P. Fitzgerald, Jason J. Wang, Jeffrey Chilcote, James R. Graham, Sebastian Bruzzone, and Paul G. Kalas "GPI observational calibrations XIV: polarimetric contrasts and new data reduction techniques", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990836 (9 August 2016);

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