This conference will celebrate the 30th anniversary of the discovery of planet 51 Peg b, at OHP where it all started, from 6 to 10 October 2025. This year edition will focus on long-period giant planets and their systems in the current observational context: long-term radial velocity surveys, direct imaging and spectroscopy of young systems, high-accuracy orbital monitoring with interferometry, characterisation of planetary companions at high spectral resolution, and the upcoming release of ESA/Gaia DR4 data that holds great promise for the exoplanet field.
Knowing the entire architecture of a system is crucial to understanding the processes of planet formation and evolution. The existence of inner planets, possibly of lower mass, can be probed by radial velocities, but also by transits. The existence of longer-period objects will be increasingly sought through imaging and long-term RV tracking.
The symposium will cover not only the existence of these planets, their systems and their architectural parameters, but also their atmospheric composition, their internal compositions, and the possibility of moons or exocomets in these systems. The instrumental roadmap for exoplanets over the next few years will enable us to make a great deal of progress in these areas and will be also discussed.
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