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, microlensing detections, 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.
The conference will be divided into six major areas:
Formation
Planetary systems, architecture, and dynamics
Planet demographics
Interior modelling and evolution
Atmospheric characterization
Future prospects and technics
Invited speakers
The list of invited speakers is under definition.
Contributed talks
Speakers are invited to highlight why studying giant long-period exoplanet is so exciting now.
Some of the most important questions in the field that could be addressed by contributed talks are:
How common are long-period giant planets, and what are their basic properties?
How do long-period giants form, and in what types of systems?
How do long-period giants change over time (and do they become hot Jupiters)?
How do giant planets interact with their disks?
How do giant planets interact with other planets and small bodies in the system?
How is the history of a giant planet imprinted in its atmosphere?
What do giant planets teach us about habitability?
What are the next steps in studying giant planets?
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