Dr Siddharth Maharana: Publications

Stress-induced birefringence in the lenses of Wide-Area Linear Optical Polarimeter-South

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V SPIE (2022) 62-62

Authors:

Ramya M Anche, Siddharth Maharana, Anamparambu N Ramaprakash, Pravin Khodade, Deepa Modi, Chaitanya Rajarshi, John A Kypriotakis, Dmitry Blinov, Hans K Eriksen, Tuhin Ghosh, Georgia V Panopoulou, Vincent Pelgrims, Raphael Skalidis, Timothy J Pearson, Eirik Gjerløw, Nikolaos Mandarakas, Vasiliki Pavlidou, Stephen Potter, Anthony CS Readhead, Konstantinos Tassis, Artem Basyrov, Katerina Papadaki, Trygve Leithe Svalheim, Ingunn Wehus

WALOP-South: A Four-Camera One-Shot Imaging Polarimeter for PASIPHAE Survey. Paper II -- Polarimetric Modelling and Calibration

ArXiv 2208.12441 (2022)

Authors:

Siddharth Maharana, Ramya M Anche, AN Ramaprakash, Bhushan Joshi, Artem Basyrov, Dmitry Blinov, Carolina Casadio, Kishan Deka, Hans Kristian Eriksen, Tuhin Ghosh, Eirik Gjerløw, John A Kypriotakis, Sebastian Kiehlmann, Nikolaos Mandarakas, Georgia V Panopoulou, Katerina Papadaki, Vasiliki Pavlidou, Timothy J Pearson, Vincent Pelgrims, Stephen B Potter, Anthony CS Readhead, Raphael Skalidis, Trygve Leithe Svalheim, Konstantinos Tassis, Ingunn K Wehus

Starlight-polarization-based tomography of the magnetized interstellar medium: PASIPHAE's line-of-sight inversion method

ArXiv 2208.02278 (2022)

Authors:

V Pelgrims, GV Panopoulou, K Tassis, V Pavlidou, A Basyrov, D Blinov, E Gjerløw, S Kiehlmann, N Mandarakas, A Papadaki, R Skalidis, A Tsouros, RM Anche, HK Eriksen, T Ghosh, JA Kypriotakis, S Maharana, E Ntormousi, TJ Pearson, SB Potter, AN Ramaprakash, ACS Readhead, IK Wehus

WALOP-South: a four-camera one-shot imaging polarimeter for PASIPHAE survey. Paper I—optical design

Journal of Astronomical Telescopes, Instruments, and Systems SPIE-Intl Soc Optical Eng 7:01 (2021) 1-24

Authors:

Siddharth Maharana, John A Kypriotakis, Anamparambu N Ramaprakash, Chaitanya Rajarshi, Ramya M Anche, Shrish Shrish, Dmitry Blinov, Hans K Eriksen, Tuhin Ghosh, Eirik Gjerløw, Nikolaos Mandarakas, Georgia V Panopoulou, Vasiliki Pavlidou, Timothy J Pearson, Vincent Pelgrims, Stephen B Potter, Anthony CS Readhead, Raphael Skalidis, Konstantinos Tassis, Ingunn K Wehus

Abstract:

The Wide-Area Linear Optical Polarimeter (WALOP)-South instrument will be mounted on the 1-m South African Astronomical Observatory telescope in South Africa as part of the Polar-Areas Stellar Imaging Polarization High Accuracy Experiment (PASIPHAE) program to carry out a linear imaging polarization survey of the Galactic polar regions in the optical band. Designed to achieve polarimetric sensitivity of 0.05% across a 35 × 35 arc min field of view (FOV), it will be capable of measuring the Stokes parameters I, q, and u in a single exposure in the R broadband and narrowband filters between 0.5 to 0.7 μm. For each measurement, four images of the full field corresponding to linear polarization angles of 0 deg, 45 deg, 90 deg, and 135 deg in the instrument coordinate system will be created on four detectors from which the Stokes parameters can be found using differential photometry. In designing the optical system, major challenges included correcting for the dispersion introduced by large split angle Wollaston prisms used as analysers and other aberrations from the entire field to obtain imaging quality point spread function (PSF) at the detector. We present the optical design of the WALOP-South instrument which overcomes these challenges and delivers near seeing limited PSFs for the entire FOV.

WALOP-South: A Four Camera One Shot Imaging Polarimeter for PASIPHAE Survey. Paper I -- Optical Design

ArXiv 2102.09505 (2021)

Authors:

Siddharth Maharana, John A Kypriotakis, AN Ramaprakash, Chaitanya Rajarshi, Ramya M Anche, Shrish, Dmitry Blinov, Hans Kristian Eriksen, Tuhin Ghosh, Eirik Gjerløw, Nikolaos Mandarakas, Georgia V Panopoulou, Vasiliki Pavlidou, Timothy J Pearson, Vincent Pelgrims, Stephen B Potter, Anthony CS Readhead, Raphael Skalidis, Konstantinos Tassis, Ingunn K Wehus

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