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Wavefront control architecture and expected performance for the TMT planetary systems imager

Guyon, Olivier and Mazin, Benjamin and Fitzgerald, Michael and Mawet, Dimitri and Marois, Christian and Skemer, Andy and Lozi, Julien and Males, Jared (2018) Wavefront control architecture and expected performance for the TMT planetary systems imager. In: Adaptive Optics Systems VI. Proceedings of SPIE. No.10703. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 107030Z. ISBN 9781510619593.

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The Planetary Systems Imager (PSI) is a modular instrument optimized for direct imaging and characterization of exoplanet and disks with the Thirty Meter Telescope (TMT). PSI will operate across a wide wavelength range (≈0.6 - 5μm) to image exoplanets and circumstellar disks in both reflected light and thermal emission. Thanks to the TMT’s large collecting area, PSI will have the sensitivity to directly image and spectrally characterize large gaseous planets with unprecedented sensitivity. PSI will also be capable of imaging rocky planets in the habitable zones of the nearest M-type stars in reflected light and search for biomarkers in their atmospheres. Imaging habitable planets in reflected light is PSI’s most challenging goal, requiring high contrast imaging (HCI) capabilities well beyond what current instruments achieve. This science goal drives PSI’s wavefront sensing and control requirements and defines the corresponding architecture discussed in this paper. We show that PSI must deliver 1e-5 image contrast ≈15 mas separation at λ ≈ 1μm-1.5μm, and that a conventional extreme-AO architecture relying on a single high speed wavefront sensor (WFS) is not sufficient to meet this requirement. We propose a wavefront control architecture relying on both visible light (λ < 1.1 μm) sensing to optimize sensitivity, and near-IR (λ > 1.1 μm) sensors to address wavefront chromaticity terms and provide high contrast imaging capability. We show that this combination will enable speckle halo suppression at the < 1e-5 raw contrast level in near-IR, allowing detection and spectroscopic characterization of potentially habitable exoplanets orbiting nearby M-type stars.

Item Type:Book Section
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URLURL TypeDescription
Guyon, Olivier0000-0002-1097-9908
Fitzgerald, Michael0000-0002-0176-8973
Mawet, Dimitri0000-0002-8895-4735
Marois, Christian0000-0002-4164-4182
Skemer, Andy0000-0001-6098-3924
Lozi, Julien0000-0002-3047-1845
Additional Information:© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). The author acknowledges funding support from the Japanese Society for the Promotion of Sciences (JSPS), the Japanese Astrobiology Center, National Institutes for Natural Sciences (ABC/NINS). The authors acknowledge support from the JSPS (Grant-in-Aid for Research 23340051 and 26220704). The authors wish to acknowledge the Center for Adaptive Optics Fall Retreat and the TMT Science Forum, where much of this work originated.
Group:Thirty Meter Telescope, Astronomy Department
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)23340051
Japan Society for the Promotion of Science (JSPS)26220704
National Institutes of Natural Sciences of JapanUNSPECIFIED
Subject Keywords:Exoplanets, High Contrast Imaging, Adaptive Optics, Coronagraphy
Series Name:Proceedings of SPIE
Issue or Number:10703
Record Number:CaltechAUTHORS:20180712-155553779
Persistent URL:
Official Citation: Olivier Guyon, Benjamin Mazin, Michael Fitzgerald, Dimitri Mawet, Christian Marois, Andy Skemer, Julien Lozi, and Jared Males "Wavefront control architecture and expected performance for the TMT Planetary Systems Imager", Proc. SPIE 10703, Adaptive Optics Systems VI, 107030Z (17 July 2018);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87815
Deposited By: George Porter
Deposited On:13 Jul 2018 16:41
Last Modified:15 Nov 2021 20:52

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