CHARA MIRC-X and MYSTIC cophasing observations to enable efficient spectro-interferometry and over-resolved object imaging

Narsireddy Anugu; John D. Monnier; Jean-Baptiste Le Bouquin; Stefan Kraus; Benjamin R. Setterholm; Theo ten Brummelaar; Gail Schaefer; Cyprien Lanthermann; Jacob Ennis

doi:10.1117/12.2629661

29 August 2022 CHARA MIRC-X and MYSTIC cophasing observations to enable efficient spectro-interferometry and over-resolved object imaging

Narsireddy Anugu, John D. Monnier, Jean-Baptiste Le Bouquin, Stefan Kraus, Benjamin R. Setterholm, Theo ten Brummelaar, Gail Schaefer, Cyprien Lanthermann, Jacob Ennis

Author Affiliations +

Proceedings Volume 12183, Optical and Infrared Interferometry and Imaging VIII; 121830J (2022) https://doi.org/10.1117/12.2629661
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

MIRC-X and MYSTIC are six telescope all-in-one beam combiners at the CHARA array, Mount Wilson Observatory, USA. These two instruments make simultaneous cophasing observations in J + H + K-band wavelengths and deliver λ/2B~0.5 mas angular resolution imaging utilizing the world's largest baseline lengths ranging from 30-330 m. MIRC-X and MYSTIC are operated in two observing modes based on the target spectrum and their over-resolved nature: (i) primary-secondary and (ii) combined mode. In the primary-secondary mode, we use one instrument as a fringe tracker and the other as a science combiner to enable high spectral resolution interferometry. Higher visibility fringes are selected depending on their baseline length and wavelengths for robust fringe tracking for over-resolved objects in the combined mode. We installed four accelerometers to study vibrations on the beam combiner table to improve fringe tracking. We here report the instrument concepts and the first on-sky science results.

Conference Presentation

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Narsireddy Anugu, John D. Monnier, Jean-Baptiste Le Bouquin, Stefan Kraus, Benjamin R. Setterholm, Theo ten Brummelaar, Gail Schaefer, Cyprien Lanthermann, and Jacob Ennis "CHARA MIRC-X and MYSTIC cophasing observations to enable efficient spectro-interferometry and over-resolved object imaging", Proc. SPIE 12183, Optical and Infrared Interferometry and Imaging VIII, 121830J (29 August 2022); https://doi.org/10.1117/12.2629661

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