New NIR spectro-polarimetric modes for the SCExAO instrument

Julien Lozi; Olivier Guyon; Tomoyuki Kudo; Jin Zhang; Nemanja Jovanovic; Barnaby Norris; Marc-Antoine Martinod; Tyler D. Groff; Jeffrey Chilcote; Motohide Tamura; Steven Bos; Frans Snik; Sébastien Vievard; Ananya Sahoo; Vincent Deo; Frantz Martinache; Jeremy Kasdin

doi:10.1117/12.2562792

13 December 2020 New NIR spectro-polarimetric modes for the SCExAO instrument

Julien Lozi, Olivier Guyon, Tomoyuki Kudo, Jin Zhang, Nemanja Jovanovic, Barnaby Norris, Marc-Antoine Martinod, Tyler D. Groff, Jeffrey Chilcote, Motohide Tamura, Steven Bos, Frans Snik, Sébastien Vievard, Ananya Sahoo, Vincent Deo, Frantz Martinache, Jeremy Kasdin

Author Affiliations +

Proceedings Volume 11448, Adaptive Optics Systems VII; 114487C (2020) https://doi.org/10.1117/12.2562792
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

Polarization Differential Imaging (PDI) is one of the most productive modes of current high-contrast imagers. Dozens of new protoplanetary, transition and debris disks were imaged recently for the first time, helping us understand the processes of planet formation, and giving clues on the mass of potential planets inside these disks, even if they cannot be imaged directly. 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. In addition, we recently commissioned two new polarimetric modules in the infrared. The first one is a spectro-polarimetric mode using the CHARIS Integral Field Spectrograph (IFS). A Wollaston prism was added in front of the IFS, reducing the field-of-view to 2x1 arcsec to accommodate for the imaging of both polarizations on the same detector without sacrificing the spectral resolution of the instrument, in any of its spectral modes. The second module, similar to VAMPIRES, uses a low-noise high frame rate C-RED ONE camera combined with a Ferroelectric Liquid Crystal (FLC) device to modulate and record the polarization at high-speed, freezing effectively the atmospheric speckles for higher precision. We present on-sky results of the new polarimetric capabilities taken during the commissioning phase. 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.

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Julien Lozi, Olivier Guyon, Tomoyuki Kudo, Jin Zhang, Nemanja Jovanovic, Barnaby Norris, Marc-Antoine Martinod, Tyler D. Groff, Jeffrey Chilcote, Motohide Tamura, Steven Bos, Frans Snik, Sébastien Vievard, Ananya Sahoo, Vincent Deo, Frantz Martinache, and Jeremy Kasdin "New NIR spectro-polarimetric modes for the SCExAO instrument", Proc. SPIE 11448, Adaptive Optics Systems VII, 114487C (13 December 2020); https://doi.org/10.1117/12.2562792

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