HARMONI at ELT : system analysis and performance estimation of the high-contrast module - ONERA - Office national d'études et de recherches aérospatiales
Communication Dans Un Congrès Année : 2022

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

Élodie Choquet
Niranjan Thatte
  • Fonction : Auteur
Fraser Clarke
  • Fonction : Auteur
Dave Melotte
  • Fonction : Auteur
Matthias Tecza
  • Fonction : Auteur
Hermine Schnetler
  • Fonction : Auteur

Résumé

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 LTAOor 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 f lux 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 di↵racted 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-o↵ 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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Dates et versions

hal-03795935 , version 1 (04-10-2022)

Identifiants

Citer

Alexis Carlotti, Laurent Jocou, Thibaut Moulin, Patrick Rabou, Alexis Bidot, et al.. HARMONI at ELT : system analysis and performance estimation of the high-contrast module. Adaptive Optics Systems VIII, Jul 2022, Montréal, Canada. pp.211, ⟨10.1117/12.2628927⟩. ⟨hal-03795935⟩
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