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Proceedings Paper

GPI observational calibrations XIV: polarimetric contrasts and new data reduction techniques
Author(s): Maxwell A. Millar-Blanchaer; Marshall D. Perrin; Li-Wei Hung; Michael P. Fitzgerald; Jason J. Wang; Jeffrey Chilcote; James R. Graham; Sebastian Bruzzone; Paul G. Kalas
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Paper Abstract

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.

Paper Details

Date Published: 9 August 2016
PDF: 17 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990836 (9 August 2016); doi: 10.1117/12.2233071
Show Author Affiliations
Maxwell A. Millar-Blanchaer, Univ. of Toronto (Canada)
Dunlap Institute for Astronomy & Astrophysics, Univ. of Toronto (Canada)
Marshall D. Perrin, Space Telescope Science Institute (United States)
Li-Wei Hung, Univ. of California, Los Angeles (United States)
Michael P. Fitzgerald, Univ. of California, Los Angeles (United States)
Jason J. Wang, Univ. of California, Berkeley (United States)
Jeffrey Chilcote, Dunlap Institute for Astronomy & Astrophysics, Univ. of Toronto (Canada)
James R. Graham, Univ. of California, Berkeley (United States)
Sebastian Bruzzone, Western Univ. (Canada)
Paul G. Kalas, Univ. of California, Berkeley (United States)


Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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