RISTRETTO: a VLT XAO design to reach Proxima Cen b in the visible

N. Blind; M. Shinde; I. Dinis; N. Restori; B. Chazelas; T. Fusco; O. Guyon; J. Kühn; C. Lovis; P. Martinez; M. Motte; J.-F. Sauvage; A. Spang

doi:10.1117/12.3019992

27 August 2024 RISTRETTO: a VLT XAO design to reach Proxima Cen b in the visible

N. Blind, M. Shinde, I. Dinis, N. Restori, B. Chazelas, T. Fusco, O. Guyon, J. Kühn, C. Lovis, P. Martinez, M. Motte, J.-F. Sauvage, A. Spang

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130976U (2024) https://doi.org/10.1117/12.3019992
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

RISTRETTO is the evolution of the original idea of coupling the VLT instruments SPHERE and ESPRESSO, aiming at High Dispersion Coronagraphy. RISTRETTO is a visitor instrument that should enable the characterization of the atmospheres of nearby exoplanets in reflected light, by using the technique of high-contrast, high-resolution spectroscopy. Its goal is to observe Prox Cen b and other planets placed at about 35mas from their star, i.e. 2λ/D at λ=750nm. The instrument is composed of an extreme adaptive optics, a coronagraphic Integral Field Unit, and a diffraction-limited spectrograph (R=140.000, λ=620-840nm). We present the RISTRETTO XAO architecture that reach the specification, providing contrasts down to 5× 10⁻⁵ at 2λ/D from the star in the visible, in the presence of atmosphere and low wind effect. This performance is allowed by a new two-sensors-one-dm architecture, some variations to the already known concepts of unmodulated pyWFS and zWFS, and exploiting to the maximum of their capabilities the state-of-the-art high speed, low noise cameras and fast DM. We present the result of end-to-end simulations, that demonstrate stable closed loop operation of an unmodulated pyramid and a zernike WFS (together), and in presence of low wind effect.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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N. Blind, M. Shinde, I. Dinis, N. Restori, B. Chazelas, T. Fusco, O. Guyon, J. Kühn, C. Lovis, P. Martinez, M. Motte, J.-F. Sauvage, and A. Spang "RISTRETTO: a VLT XAO design to reach Proxima Cen b in the visible", Proc. SPIE 13097, Adaptive Optics Systems IX, 130976U (27 August 2024); https://doi.org/10.1117/12.3019992

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KEYWORDS

Simulations

Wavefront sensors

Sensors

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Modulation

Discontinuities

Colorimetry

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