RISTRETTO: high-resolution spectroscopy at the diffraction limit of the VLT

Christophe Lovis; Nicolas Blind; Bruno Chazelas; Jonas G. Kühn; Ludovic Genolet; Ian Hughes; Michaël Sordet; Robin Schnell; Martin Turbet; Thierry Fusco; Jean-François Sauvage; Maddalena Bugatti; Nicolas Billot; Janis Hagelberg; Eddy Hocini; Olivier Guyon

doi:10.1117/12.2627923

29 August 2022 RISTRETTO: high-resolution spectroscopy at the diffraction limit of the VLT

Christophe Lovis, Nicolas Blind, Bruno Chazelas, Jonas G. Kühn, Ludovic Genolet, Ian Hughes, Michaël Sordet, Robin Schnell, Martin Turbet, Thierry Fusco, Jean-François Sauvage, Maddalena Bugatti, Nicolas Billot, Janis Hagelberg, Eddy Hocini, Olivier Guyon

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121841Q (2022) https://doi.org/10.1117/12.2627923
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

RISTRETTO is a visible high-resolution spectrograph fed by an extreme adaptive optics (AO) system, to be proposed as a visitor instrument on ESO VLT. The main science goal of RISTRETTO is the detection and atmospheric characterisation of exoplanets in reflected light, in particular the temperate rocky planet Proxima b. RISTRETTO will be able to measure albedos and detect atmospheric features in a number of exoplanets orbiting nearby stars for the first time. It will do so by combining a high-contrast AO system working at the diffraction limit of the telescope to a high-resolution spectrograph, via a 7-spaxel integral-field unit (IFU) feeding single-mode fibers. Further science cases for RISTRETTO include the study of accreting protoplanets such as PDS70b/c through spectrally-resolved H-alpha emission, and spatially-resolved studies of Solar System objects such as icy moons and the ice giants Uranus and Neptune. The project is in an advanced design phase for the spectrograph and IFU/fiber-link sub-systems, and a preliminary design phase for the AO front-end. Construction of the spectrograph and IFU/fiber-link will start early 2022. RISTRETTO is a pathfinder instrument in view of similar developments at the ELT, in particular the SCAO-IFU mode of ELT-HIRES and the future ELT-PCS instrument.

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Christophe Lovis, Nicolas Blind, Bruno Chazelas, Jonas G. Kühn, Ludovic Genolet, Ian Hughes, Michaël Sordet, Robin Schnell, Martin Turbet, Thierry Fusco, Jean-François Sauvage, Maddalena Bugatti, Nicolas Billot, Janis Hagelberg, Eddy Hocini, and Olivier Guyon "RISTRETTO: high-resolution spectroscopy at the diffraction limit of the VLT", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121841Q (29 August 2022); https://doi.org/10.1117/12.2627923

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