In just 3 observing cycles, the James Webb Space Telescope (JWST) has already revolutionized the science of exoplanets and exoplanetary systems. Its unrivalled sensitivity and spectral resolution, particularly in the mid-infrared, have enabled previously unattainable diagnoses to be made. Significant breakthroughs have been made in all sub-fields related to exoplanetary systems, from transiting rocky planets to gas giant planets, and from the chemistry of inner disks to the physics of cold outer disks.

As the pressure to obtain observing time with this observatory keeps increasing, it is all the more necessary to join forces to develop competitive science cases with multiple expertise from observations to theory.

To help the French exosystem community to develop strong and successful proposals, we will be holding the 3rd edition of the JWST Exosystem Proposal Preparation Workshop series on June 18-19 at the Laboratoire d'Astrophysique de Marseille.
This two-day workshop will be organized in two parts:
- A session with invited talks from experts about the health of the telescope and its instruments, and reviews on the latest JWST results on Exosystems sub-fields,
- A brainstorming session in small groups to develop collaborative proposals on key science cases.

Participation from both experts and early-career scientists (PhD students and postdocs) are welcome and encouraged.
No registration fee. Meals will be provided by the workshop. Participants are responsible for their own travel and accommodation expenses.
A financial contribution may be provided on a case-by-case basis upon explicit and justified request.

Roman Coronagraph splinter session:
In conjunction with the JEPP workshop, a session to coordinate the preparation of proposals for the Roman Space Telescope Coronagraph will be held on the morning of Friday June 20. Workshop participants interested in the Roman Coronagraph are invited to attend this additional session.

Key dates:
- April 7th: first announcement
- April 14th: 2nd announcement & registration open
- May 16th: registration deadline
- June 18-19: workshop in Marseille