The dynamics and evolution of planets and other large objects (satellites, dwarf planets) are largely driven by density contrasts between the surface and depth, owing to temperature, composition or partial melt formation. Early in their history, this contrast may lead to differentiation and crust formation at the planet surface. On longer times scales, convection acts to erase this contrast, in liquid as well as solid shells, at a rate controlled by the imbalance between heat production, in particular radiogenic, and heat loss. Convective processes are at the origin of many potentially observable features of planets, like volcanism, surface currents on liquid or gaseous planets, topography of solid surface planets, magnetic fields that are generated by dynamo action in the planets? liquid shells. Some of these signals are also blurred by surface processes like weathering or cratering. This symposium/special session welcomes all contributions addressing the present and past dynamics of planets using any of all the complementary approaches, like observations from satellites, meteorites or landers, experiments and models. Results linked to space exploration missions are encouraged (e.g. New horizon, Juno, Cassini...) . A specific focus will be given to the first results of the Insight mission that will land on Mars on November 26th 2018 and that will provide important clues on its internal deep and shallow structure and dynamics.

Programme

• Accretion and differentiation
• Formation of moons
• Thermal, compositional and magnetic evolution of planets
• Magma and water oceans and volcanic processes through time
• Internal structures of planetary bodies
• Cratering and weathering processes

Invited speakers

• Miki Nakajima(University of Rochester, NY, USA)
• Gaël Choblet(Université de Nantes, France)
• Philippe Lognonné (Institut de Physique du Globe de Paris, France)

Scientific organisers

Stéphane Labrosse, Chloé Michaut

Contact

stephane.labrosse @ ens-lyon.fr, chloe.michaut @ ens-lyon.fr