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Opto-mechanical design of a High Contrast Module (HCM) for HARMONI
Author(s): F. Hénault; A. Carlotti; P. Rabou; Y. Magnard; E. Sradler; D. Mouillet; G. Chauvin; M. Bonnefoy; J. F. Sauvage; K. Dohlen; A. Vigan; T. Fusco; K. El Hadi; P. Vola; F. Clarke; N. Thatte; I. Bryson; H. Schnetler; M. Tecza; C. Vérinaud
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Paper Abstract

HARMONI is a first-light visible and near-IR integral field spectrograph of ESO’s Extremely Large Telescope (ELT) which will sit on top of Cerro Armazones, Chile. A Single Conjugate Adaptive Optics (SCAO) sub-system will provide diffraction-limited spectral images in a Nyquist-sampled 0.61 × 0.86 arcsec field of view, with a R=3000-20000 spectral resolution. Inside the instrument, a High Contrast Module (HCM) will add an essential high-contrast imaging capability for HARMONI to spectrally characterize young giant exoplanets and disks with flux ratio down to 1e-6 at 0.1-0.2” from their star. The HCM uses an apodized pupil coronagraph to lower the intensity of the diffracted starlight and limit the dynamic range on the detector, and an internal wavefront sensor to calibrate non-common path aberrations. This communication first summarizes the basic technical requirements of the HCM, then describes its optical and mechanical designs, and presents expected performance in terms of achievable contrast, image quality and throughput. Elements of the development and test program are also given.

Paper Details

Date Published: 8 July 2018
PDF: 12 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107028N (8 July 2018); doi: 10.1117/12.2309373
Show Author Affiliations
F. Hénault, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble Alpes, CNRS (France)
A. Carlotti, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble Alpes, CNRS (France)
P. Rabou, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble Alpes, CNRS (France)
Y. Magnard, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble Alpes, CNRS (France)
E. Sradler, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble Alpes, CNRS (France)
D. Mouillet, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble Alpes, CNRS (France)
G. Chauvin, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble Alpes, CNRS (France)
M. Bonnefoy, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble Alpes, CNRS (France)
J. F. Sauvage, Aix Marseille Univ., LAM, CNRS (France)
ONERA (France)
K. Dohlen, Aix Marseille Univ., LAM, CNRS (France)
A. Vigan, Aix Marseille Univ., LAM, CNRS (France)
T. Fusco, Aix Marseille Univ., LAM, CNRS (France)
ONERA (France)
K. El Hadi, Aix Marseille Univ., LAM, CNRS (France)
P. Vola, Aix Marseille Univ., LAM, CNRS (France)
F. Clarke, Univ. of Oxford (United Kingdom)
N. Thatte, Univ. of Oxford (United Kingdom)
I. Bryson, UK Astronomy Technology Ctr. (United Kingdom)
H. Schnetler, UK Astronomy Technology Ctr. (United Kingdom)
M. Tecza, UK Astronomy Technology Ctr. (United Kingdom)
C. Vérinaud, European Southern Observatory (Germany)


Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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