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WIRC-POL: 0.1% polarimetric precision on-sky with the installation of a HWP modulator

Millar-Blanchaer, Maxwell A. and Jovanovic, Nemanja and Tinyanont, Samaporn and Mawet, Dimitri P. and Vasisht, Gautam and Milburn, Jennifer W. and Serabyn, Eugene and Porter, Michael and Palatnick, Skyler (2020) WIRC-POL: 0.1% polarimetric precision on-sky with the installation of a HWP modulator. In: Ground-based and Airborne Instrumentation for Astronomy VIII. Proceedings of SPIE. No.11447. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 114475Y. ISBN 9781510636811. https://resolver.caltech.edu/CaltechAUTHORS:20210122-074904083

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Abstract

WIRC+Pol is a J and H-band linear spectropolarimetric mode for the prime-focus WIRC camera at the Palomar 200-inch Hale telescope. The mode is enabled by a split-pupil polarization grating that allows for the simultaneous measurement of Stokes Q and U without the use of a modulator at a seeing-limited spectral resolving power of ~100. To overcome time-dependent instrumental polarization effects that limited the calibration of instrumental polarization to a ~1% level, in February 2019 we installed a linear polarizer and half-wave plate modulator in front of the instrument, both of which are rotatable. With these two new optics, we are now able to calibrate the instrumental polarization to less than 0.1%. Here we report on WIRC+Pol’s post-upgrade on-sky performance, including a polarimetric instrument model that we characterize as a function of time and focal-plane location.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2562762DOIConference Poster
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11447/114475Y/WIRC-POL--01-polarimetric-precision-on-sky-with-the/10.1117/12.2562762.fullPublisherConference Poster
ORCID:
AuthorORCID
Millar-Blanchaer, Maxwell A.0000-0001-6205-9233
Jovanovic, Nemanja0000-0001-5213-6207
Tinyanont, Samaporn0000-0002-1481-4676
Mawet, Dimitri P.0000-0002-8895-4735
Vasisht, Gautam0000-0002-1871-6264
Porter, Michael0000-0003-3168-5586
Additional Information:© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE).
Group:Astronomy Department
Series Name:Proceedings of SPIE
Issue or Number:11447
Record Number:CaltechAUTHORS:20210122-074904083
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210122-074904083
Official Citation:Maxwell A. Millar-Blanchaer, Nemanja Jovanovic, Samaporn Tinyanont, Dimitri P. Mawet, Gautam Vasisht, Jennifer W. Milburn, Eugene Serabyn, Michael Porter, and Skyler Palatnick "WIRC-POL: 0.1% polarimetric precision on-sky with the installation of a HWP modulator", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114475Y (13 December 2020); https://doi.org/10.1117/12.2562762
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107648
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Jan 2021 18:23
Last Modified:22 Jan 2021 18:23

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