MIRC-X polarinterferometry at CHARA

Benjamin R. Setterholm; John D. Monnier; Jean-Baptiste Le Bouquin; Narsireddy Anugu; Aaron Labdon; Jacob Ennis; Keith J. C. Johnson; Stefan Kraus; Theo ten Brummelaar

doi:10.1117/12.2562407

13 December 2020 MIRC-X polarinterferometry at CHARA

Benjamin R. Setterholm, John D. Monnier, Jean-Baptiste Le Bouquin, Narsireddy Anugu, Aaron Labdon, Jacob Ennis, Keith J. C. Johnson, Stefan Kraus, Theo ten Brummelaar

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Proceedings Volume 11446, Optical and Infrared Interferometry and Imaging VII; 114460R (2020) https://doi.org/10.1117/12.2562407
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

We present a new polarimetric mode for the MIRC-X 6-telescope beam combiner at CHARA. Utilizing the extensive u − v coverage afforded by CHARA this mode will be able to resolve and constrain scattered light in environs at milliarcsecond separations of target stars, a largely unexplored parameter space to-date in astronomy. Notably, this upgrade will allow for the investigation of the scattering properties of the inner dust wall at the sublimation radius of Herbig Ae/Be star disks, dust shells surrounding evolved stars, and gas-rich disks around Be stars. Our design adds a series of rotating half-wave plates, achromatic across J- and H-bands, and a polarizing beamsplitter into the MIRC-X beam path. In this work, we also preview on-sky observations, discussing ongoing work calibrating instrumental polarization effects in the CHARA beam path as well as upgrades to the MIRC-X data reduction pipeline.

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Benjamin R. Setterholm, John D. Monnier, Jean-Baptiste Le Bouquin, Narsireddy Anugu, Aaron Labdon, Jacob Ennis, Keith J. C. Johnson, Stefan Kraus, and Theo ten Brummelaar "MIRC-X polarinterferometry at CHARA", Proc. SPIE 11446, Optical and Infrared Interferometry and Imaging VII, 114460R (13 December 2020); https://doi.org/10.1117/12.2562407

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