RISTRETTO: a VLT XAO design to reach Proxima Cen b in the visible
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909313410269184 |
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| author | Blind, N. Shinde, M. Dinis, I. Restori, N. Chazelas, B. Fusco, T. Guyon, O. Kuehn, J. Lovis, C. Martinez, P. Motte, M. Sauvage, J. -F. Spang, A. |
| author_facet | Blind, N. Shinde, M. Dinis, I. Restori, N. Chazelas, B. Fusco, T. Guyon, O. Kuehn, J. Lovis, C. Martinez, P. Motte, M. Sauvage, J. -F. Spang, A. |
| contents | RISTRETTO is the evolution of the original idea of coupling the VLT instruments SPHERE and ESPRESSO \cite{lovis_2016a}, 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=$620-840 nm).
We present the RISTRETTO XAO architecture that reach the specification, providing contrasts down to $5\times10^{-5}$ at 2$λ/D$ 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 \& 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2409_08052 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | RISTRETTO: a VLT XAO design to reach Proxima Cen b in the visible Blind, N. Shinde, M. Dinis, I. Restori, N. Chazelas, B. Fusco, T. Guyon, O. Kuehn, J. Lovis, C. Martinez, P. Motte, M. Sauvage, J. -F. Spang, A. Instrumentation and Methods for Astrophysics Earth and Planetary Astrophysics RISTRETTO is the evolution of the original idea of coupling the VLT instruments SPHERE and ESPRESSO \cite{lovis_2016a}, 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=$620-840 nm). We present the RISTRETTO XAO architecture that reach the specification, providing contrasts down to $5\times10^{-5}$ at 2$λ/D$ 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 \& 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. |
| title | RISTRETTO: a VLT XAO design to reach Proxima Cen b in the visible |
| topic | Instrumentation and Methods for Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2409.08052 |