Characterisation of giant planets at high spectral resolution: recent results from VLT/HiRISE and pe

A major endeavour of this decade is the direct characterisation 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. In the past few years, several prototype instruments have implemented a fibre coupling between AO-equipped systems and high-resolution spectrographs with the sole purpose of enabling the characterisation of low-mass companions. Among them is the HiRISE visitor instrument on the VLT-UT3, which combines the SPHERE exoplanet imager with the upgraded CRIRES spectrograph to enable new science. After the successful commissioning at the summer of 2023, we started the HiRISE survey targeting most previously imaged sub-stellar companions. In this presentation we will report on the status of the survey and its early results, with a specific focus on the cold companions AF Lep b and 51 Eri b. We will also present how the current results of HiRISE are highly relevant for future ELT observations with first-light instrument and on the longer term with PCS.