TY - CONF
T1 - New NIR spectro-polarimetric modes for the SCExAO instrument
AU - Lozi, Julien
AU - Guyon, Olivier
AU - Jovanovic, Nemanja
AU - Norris, Barnaby
AU - Groff, Tyler D.
AU - Chilcote, Jeffrey
AU - Kasdin, Jeremy
AU - Kudo, Tomoyuki
AU - Tamura, Motohide
AU - Zhang, Jin
AU - Bos, Steven
AU - Snik, Frans
AU - Doelman, David
AU - Mazin, Ben
AU - Walter, Alex
AU - Vievard, Sebastien
AU - Sahoo, Ananya
AU - Martinache, Frantz
N1 - Funding Information:
The development of SCExAO was supported by the Japan Society for the Promotion of Science (Grant-in-Aid for Research #23340051, #26220704, #23103002, #19H00703 & #19H00695), the Astrobiology Center of the National Institutes of Natural Sciences, Japan, the Mt Cuba Foundation and the director’s contingency fund at Subaru Telescope. F. Martinache’s work is supported by the ERC award CoG - 683029. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
Publisher Copyright:
© 2019 AO4ELT 2019 - Proceedings 6th Adaptive Optics for Extremely Large Telescopes. All rights reserved.
PY - 2019
Y1 - 2019
N2 - The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument is equipped with a fast visible dual-camera polarimetric module, VAMPIRES, already producing valuable scientific observations of protoplanetary disks and dust shells. We present two new polarimetric modules that were recently implemented,. using the NIR light from y- to K-band and identical Wollaston prisms to split the polarizations. The fast polarization module follows a design similar to VAMPIRES, with a fast IR camera either the First Light C-RED 2 or a Leonardo SAPHIRA detector that can run at kilohertz frame rates, and a Ferroelectric Liquid Crystal (FLC) device modulating the polarization in a synchronized way with the acquisition. The fast frame rate coupled with the FLC allows to freeze atmospheric speckles and to calibrate more precisely the degree of polarization of the target, as already demonstrated by VAMPIRES. For the second module, we perform spectro-polarimetric measurements at a slower rate, using the CHARIS Integral Field Spectrograph (IFS). The field-of-view is reduced by a factor 2 in one direction to 2x1 arcsec, to accommodate for the imaging of both polarizations on the same detector without sacrificing the spectral resolution of the instrument. This is the first demonstration of a high-contrast spectro-polarimeter using an IFS. We present on-sky results of the new polarimetric capabilities taken during the commissioning phase, on strongly polarized targets. In addition, we show future capabilities that are already scheduled to increase the performance of these modules, especially the addition of non-redundant masks, as well as a polarimetric vector Apodizing Phase Plate (vAPP) coronagraph.
AB - The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument is equipped with a fast visible dual-camera polarimetric module, VAMPIRES, already producing valuable scientific observations of protoplanetary disks and dust shells. We present two new polarimetric modules that were recently implemented,. using the NIR light from y- to K-band and identical Wollaston prisms to split the polarizations. The fast polarization module follows a design similar to VAMPIRES, with a fast IR camera either the First Light C-RED 2 or a Leonardo SAPHIRA detector that can run at kilohertz frame rates, and a Ferroelectric Liquid Crystal (FLC) device modulating the polarization in a synchronized way with the acquisition. The fast frame rate coupled with the FLC allows to freeze atmospheric speckles and to calibrate more precisely the degree of polarization of the target, as already demonstrated by VAMPIRES. For the second module, we perform spectro-polarimetric measurements at a slower rate, using the CHARIS Integral Field Spectrograph (IFS). The field-of-view is reduced by a factor 2 in one direction to 2x1 arcsec, to accommodate for the imaging of both polarizations on the same detector without sacrificing the spectral resolution of the instrument. This is the first demonstration of a high-contrast spectro-polarimeter using an IFS. We present on-sky results of the new polarimetric capabilities taken during the commissioning phase, on strongly polarized targets. In addition, we show future capabilities that are already scheduled to increase the performance of these modules, especially the addition of non-redundant masks, as well as a polarimetric vector Apodizing Phase Plate (vAPP) coronagraph.
KW - Adaptive optics
KW - High-contrast imaging
KW - Polarimetry
KW - Spectro-polarimetry
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M3 - Paper
AN - SCOPUS:85084945017
T2 - 6th International Conference on Adaptive Optics for Extremely Large Telescopes, AO4ELT 2019
Y2 - 9 June 2019 through 14 June 2019
ER -