The conceptual design of GMagAO-X: visible wavelength high contrast imaging with GMT

Jared R. Males; Laird M. Close; Sebastiaan Y. Haffert; Olivier Guyon; Victor Gasho; Fernando Coronado; Oliver Durney; Alexander Hedglen; Maggie Kautz; Jamison Noenickx; John Ford; Tom Connors; Doug Kelly

doi:10.1117/12.2630619

29 August 2022 The conceptual design of GMagAO-X: visible wavelength high contrast imaging with GMT

Jared R. Males, Laird M. Close, Sebastiaan Y. Haffert, Olivier Guyon, Victor Gasho, Fernando Coronado, Oliver Durney, Alexander Hedglen, Maggie Kautz, Jamison Noenickx, John Ford, Tom Connors, Doug Kelly

Author Affiliations +

Proceedings Volume 12185, Adaptive Optics Systems VIII; 121854J (2022) https://doi.org/10.1117/12.2630619
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

We present the conceptual design of GMagAO-X, an extreme adaptive optics system for the 25 m Giant Magellan Telescope (GMT). We are developing GMagAO-X to be available at or shortly after first-light of the GMT, to enable early high contrast exoplanet science in response to the Astro2020 recommendations. A key science goal is the characterization of nearby potentially habitable terrestrial worlds. GMagAO-Xis a woofer-tweeter system, with integrated segment phasing control. The tweeter is a 21,000 actuator segmented deformable mirror, composed of seven 3000 actuator segments. A multi-stage wavefront sensing system provides for bootstrapping, phasing, and high order sensing. The entire instrument is mounted in a rotator to provide gravity invariance. After the main AO system, visible (g to y) and near-IR (Y to H) science channels contain integrated coronagraphic wavefront control systems. The fully corrected and, optionally, coronagraphically filtered beams will then be fed to a suite of focal plane instrumentation including imagers and spectrographs. This will include existing facility instruments at GMT via fiber feeds. To assess the design we have developed an end-to-end frequency-domain modeling framework for assessing the performance of GMagAO-X. The dynamics of the many closed-loop feedback control systems are then modeled. Finally, we employ a frequency-domain model of post-processing algorithms to analyze the final post-processed sensitivity. The CoDR for GMagAO-X was held in September, 2021. Here we present an overview of the science cases, instrument design, expected performance, and concept of operations for GMagAO-X.

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Jared R. Males, Laird M. Close, Sebastiaan Y. Haffert, Olivier Guyon, Victor Gasho, Fernando Coronado, Oliver Durney, Alexander Hedglen, Maggie Kautz, Jamison Noenickx, John Ford, Tom Connors, and Doug Kelly "The conceptual design of GMagAO-X: visible wavelength high contrast imaging with GMT", Proc. SPIE 12185, Adaptive Optics Systems VIII, 121854J (29 August 2022); https://doi.org/10.1117/12.2630619

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KEYWORDS

Planets

Exoplanets

Adaptive optics

Actuators

Stars

Coronagraphy

Control systems

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