WALOP-South: A Four-Camera One-Shot Imaging Polarimeter for PASIPHAE Survey. Paper II -- Polarimetric Modelling and Calibration
Siddharth Maharana, Ramya M. Anche, A. N. Ramaprakash, Bhushan Joshi,, Artem Basyrov, Dmitry Blinov, Carolina Casadio, Kishan Deka, Hans Kristian, Eriksen, Tuhin Ghosh, Eirik Gjerl{\o}w, John A. Kypriotakis, Sebastian, Kiehlmann, Nikolaos Mandarakas, Georgia V. Panopoulou

TL;DR
WALOP-South is a high-precision, wide-field optical polarimeter designed for the PASIPHAE survey, with detailed polarimetric modeling and calibration methods to achieve 0.1% measurement accuracy.
Contribution
This paper presents the comprehensive polarimetric modeling and calibration techniques for WALOP-South, enabling accurate Stokes parameter measurements in a single exposure.
Findings
Successful modeling of instrumental polarization sources
Development of a calibration method to correct instrumental effects
Validation of calibration on a WALOP-like test-bed
Abstract
The Wide-Area Linear Optical Polarimeter (WALOP)-South instrument is an upcoming wide-field and high-accuracy optical polarimeter to be used as a survey instrument for carrying out the Polar-Areas Stellar Imaging in Polarization High Accuracy Experiment (PASIPHAE) program. Designed to operate as a one-shot four-channel and four-camera imaging polarimeter, it will have a field of view of arcminutes and will measure the Stokes parameters , , and in a single exposure in the SDSS-r broadband filter. The design goal for the instrument is to achieve an overall polarimetric measurement accuracy of 0.1 % over the entire field of view. We present here the complete polarimetric modeling of the instrument, characterizing the amount and sources of instrumental polarization. To accurately retrieve the real Stokes parameters of a source from the measured values, we have…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Solar and Space Plasma Dynamics
