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WALOP-South: a four-camera one-shot imaging polarimeter for PASIPHAE survey. Paper II – polarimetric modeling and calibration

Maharana, Siddharth and Anche, Ramya M. and Ramaprakash, Anamparambu N. and Joshi, Bhushan and Basyrov, Artem and Blinov, Dmitry and Casadio, Carolina and Deka, Kishan and Eriksen, Hans Kristian and Ghosh, Tuhin and Gjerløw, Eirik and Kypriotakis, John A. and Kiehlmann, Sebastian and Mandarakas, Nikolaos and Panopoulou, Georgia V. and Papadaki, Katerina and Pavlidou, Vasiliki and Pearson, Timothy J. and Pelgrims, Vincent and Potter, Stephen B. and Readhead, Anthony C. S. and Skalidis, Raphael and Svalheim, Trygve Leithe and Tassis, Konstantinos and Wehus, Ingunn K. (2022) WALOP-South: a four-camera one-shot imaging polarimeter for PASIPHAE survey. Paper II – polarimetric modeling and calibration. Journal of Astronomical Telescopes, Instruments, and Systems, 8 (3). Art. No. 038004. ISSN 2329-4124. doi:10.1117/1.jatis.8.3.038004.

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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 program. Designed to operate as a one-shot four-channel and four-camera imaging polarimeter, it will have a field of view of 35 × 35 arcminutes and will measure the Stokes parameters l, q, and u in a single exposure in the Sloan Digital Sky Survey-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 developed a calibration method for the instrument. Using this calibration method and simulated data, we demonstrate how to correct for instrumental polarization and obtain 0.1% accuracy in degree of polarization, p. In addition, we tested and validated the calibration method by implementing it on a table-top WALOP like test-bed polarimeter in the laboratory.

Item Type:Article
Related URLs:
URLURL TypeDescription
Maharana, Siddharth0000-0002-7072-3904
Anche, Ramya M.0000-0002-4989-6253
Ramaprakash, Anamparambu N.0000-0001-5707-4965
Casadio, Carolina0000-0003-1117-2863
Deka, Kishan0000-0002-8229-4326
Eriksen, Hans Kristian0000-0003-2332-5281
Kypriotakis, John A.0000-0002-3218-4030
Kiehlmann, Sebastian0000-0001-6314-9177
Mandarakas, Nikolaos0000-0002-2567-2132
Panopoulou, Georgia V.0000-0001-7482-5759
Pavlidou, Vasiliki0000-0002-0870-1368
Pearson, Timothy J.0000-0001-5213-6231
Pelgrims, Vincent0000-0002-5053-3847
Potter, Stephen B.0000-0002-5956-2249
Readhead, Anthony C. S.0000-0001-9152-961X
Skalidis, Raphael0000-0003-2337-0277
Svalheim, Trygve Leithe0000-0001-7218-3051
Tassis, Konstantinos0000-0002-8831-2038
Wehus, Ingunn K.0000-0003-3821-7275
Additional Information:The PASIPHAE program is supported by grants from the European Research Council (ERC) under Grant Agreement Nos. 771282 and 772253; by the National Science Foundation (NSF) award AST-2109127; by the National Research Foundation of South Africa under the National Equipment Programme; by the Stavros Niarchos Foundation under grant PASIPHAE; and by the Infosys Foundation. This work utilized the open-source software packages Astropy, Numpy, Scipy, Matplotlib, and Jupyter notebook. We are thankful to Vinod Vats at Karl Lambrecht Corp. for his inputs and suggestions on various aspects of half-wave plate design and performance.
Group:Astronomy Department
Funding AgencyGrant Number
European Research Council (ERC)771282
European Research Council (ERC)772253
National Research Foundation (South Africa)UNSPECIFIED
Stavros Niarchos FoundationUNSPECIFIED
Infosys FoundationUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20221024-123751900.11
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117542
Deposited By: Research Services Depository
Deposited On:28 Oct 2022 22:42
Last Modified:01 Nov 2022 17:23

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