Séminaire IPAG

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VLT/HiRISE: Direct characterization of young giant exoplanets at high spectral resolution

jeudi 11 avril 2024 - 11h00

Arthur Vigan - LAM
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A major endeavor of this decade is the direct characterization of young giant exoplanets at high spectral resolution to determine the composition of their atmosphere and infer their formation processes and evolution. Such a goal represents a major challenge owing to their small angular separation and luminosity contrast with respect to their parent stars. Instead of designing and implementing completely new facilities, it has been proposed to leverage the capabilities of existing instruments that offer either high contrast imaging or high dispersion spectroscopy, by coupling them using optical fibers. In this seminar I present the HiRISE instrument at the very large telescope (VLT), which combines the exoplanet imager SPHERE with the recently upgraded high resolution spectrograph CRIRES using single-mode fibers. The goal of HiRISE is to enable the characterization of known companions in the H band, at a spectral resolution of the order of R = 100 000, in a few hours of observing time. I will present the science case, the main design choices and the technical implementation of the system, the first performance assessment after commissioning, and finally some early results from the survey started in November 2023.

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Hôtes : Philippe Delorme

Salle Manuel Forestini, 414 rue de la piscine, 38400 Saint Martin d'Hères