HARMONI at ELT: system analysis and performance estimation of the high-contrast module

Alexis Carlotti; Laurent Jocou; Thibaut Moulin; Patrick Rabou; Alexis Bidot; Adrien Hours; Yves Magnard; Alain Delboulbé; Fabrice Pancher; Élodie Choquet; Arthur Vigan; Matthis Houlé; Kjetil Dohlen; Jean-François Sauvage; Thierry Fusco; Niranjan Thatte; Benoit Neichel; Fraser Clarke; Dave Melotte; Matthias Tecza; Hermine Schnetler

doi:10.1117/12.2628927

29 August 2022 HARMONI at ELT: system analysis and performance estimation of the high-contrast module

Alexis Carlotti, Laurent Jocou, Thibaut Moulin, Patrick Rabou, Alexis Bidot, Adrien Hours, Yves Magnard, Alain Delboulbé, Fabrice Pancher, Élodie Choquet, Arthur Vigan, Matthis Houlé, Kjetil Dohlen, Jean-François Sauvage, Thierry Fusco, Niranjan Thatte, Benoit Neichel, Fraser Clarke, Dave Melotte, Matthias Tecza, Hermine Schnetler

Author Affiliations +

Proceedings Volume 12185, Adaptive Optics Systems VIII; 121855L (2022) https://doi.org/10.1117/12.2628927
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

HARMONI is the first light visible and near-IR integral field spectrograph for the ELT. It covers a large spectral range from 450nm to 2450nm with resolving powers from 3500 to 18000 and spatial sampling from 60mas to 4mas. It can operate in two Adaptive Optics modes - SCAO (including a High Contrast capability) and LTAO - or with NOAO. The project is preparing for Final Design Reviews. The high-contrast module (HCM) has been designed to characterize planets as close as 100mas from their host star (goal: 50mas), and presenting a 1e-6 flux ratio with it. To do so, it will use (1) a passive atmospheric dispersion corrector, (2) a set of amplitude apodizers and focal plane masks to lower the diffracted intensity next to the star and attenuate the PSF core, (3) a dedicated Zernike wavefront sensor to track the non-common path aberrations with the SCAO subsystem at a 0.1Hz frequency, and (4) post-processing algorithms that will rely on the temporal and spectral diversity of the IFS data to separate the planetary signals from the noise. This communication details several trade-off analyses involved in the co-design of the hardware of the HCM. It also presents contrast performance estimates that have been derived through an analysis of post-processed, simulated IFS data obtained with an end-to-end numerical model of the HCM and the rest of HARMONI. The respective interests of ADI and molecular mapping are compared in this specific case.

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Alexis Carlotti, Laurent Jocou, Thibaut Moulin, Patrick Rabou, Alexis Bidot, Adrien Hours, Yves Magnard, Alain Delboulbé, Fabrice Pancher, Élodie Choquet, Arthur Vigan, Matthis Houlé, Kjetil Dohlen, Jean-François Sauvage, Thierry Fusco, Niranjan Thatte, Benoit Neichel, Fraser Clarke, Dave Melotte, Matthias Tecza, and Hermine Schnetler "HARMONI at ELT: system analysis and performance estimation of the high-contrast module", Proc. SPIE 12185, Adaptive Optics Systems VIII, 121855L (29 August 2022); https://doi.org/10.1117/12.2628927

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