RISTRETTO: coronagraph and AO designs enabling High Dispersion Coronagraphy at 2 λ/D

N. Blind; B. Chazelas; J. Kühn; E. Hocimi; C. Lovis; M. Beaulieu; T. Fusco; L. Genolet; O. Guyon; J. Hagelberg; I. Hughes; P. Martinez; J.-F. Sauvage; R. Schnell; M. Sordet; A. Spang

doi:10.1117/12.2628320

29 August 2022 RISTRETTO: coronagraph and AO designs enabling High Dispersion Coronagraphy at 2 λ/D

N. Blind, B. Chazelas, J. Kühn, E. Hocimi, C. Lovis, M. Beaulieu, T. Fusco, L. Genolet, O. Guyon, J. Hagelberg, I. Hughes, P. Martinez, J.-F. Sauvage, R. Schnell, M. Sordet, A. Spang

Author Affiliations +

Proceedings Volume 12185, Adaptive Optics Systems VIII; 1218573 (2022) https://doi.org/10.1117/12.2628320
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

RISTRETTO is the evolution of the original idea of coupling the VLT instruments SPHERE and ESPRESSO,1 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 status of our studies regarding the coronagraphic IFU and the XAO system. The first in particular is based on a modified version of the PIAA apodizer, allowing nulling on the first diffraction ring. Our proposed design has the potential to reach ≥ 50% coupling and ≤ 10⁻⁴ contrast at 2λ/D in median seeing conditions.

Citation Download Citation

N. Blind, B. Chazelas, J. Kühn, E. Hocimi, C. Lovis, M. Beaulieu, T. Fusco, L. Genolet, O. Guyon, J. Hagelberg, I. Hughes, P. Martinez, J.-F. Sauvage, R. Schnell, M. Sordet, and A. Spang "RISTRETTO: coronagraph and AO designs enabling High Dispersion Coronagraphy at 2 λ/D", Proc. SPIE 12185, Adaptive Optics Systems VIII, 1218573 (29 August 2022); https://doi.org/10.1117/12.2628320

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available