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Tides on Mercury with a Deep Solid-Liquid Mixed Layer

Tidal response provides information of the interior structure of planetary bodies. Recent estimates on the tidal Love number of Mercury are higher than previous estimates, suggesting a soft interior structure. One of intriguing idea is a partially molten layer at the base of the mantle, as is also proposed for the Moon and Mars. We calculate tidal responses of Mercury with a solid-liquid mixed layer using a dynamical poroviscoelastic gravitational theory we recently established. We find that a conventional treatment for partial melting invoking an exponentially reduced viscosity leads to an overestimation of the degree of melting from the tidal Love number k_2. We also present a pattern of tidal deformation. Future analyses using our approach would be beneficial for BepiColombo as well as other planetary exploration missions.

Mercury, the innermost planet in our Solar System, with its unique features, holds vital clues to understanding the evolution of terrestrial planets and the solar system. NASA's Mariner-10 and MESSENGER missions provided valuable insights but also left outstanding questions. These will soon to be addressed by the joint ESA-JAXA two spacecraft mission, BepiColombo, which is currently en route to Mercury and has already conducted several flybys. This session welcomes contributions on all aspects of Mercury's environment, including its origin, formation, geology, surface composition, interior structure, exosphere, magnetosphere, gravity, and magnetic fields, as well as their coupling using various research methods such as modeling, laboratory experiments, and observations (ground-based, remote-sensing, and in-situ). We also encourage early analyses of BepiColombo flyby data and discussions regarding future missions to Mercury.

Japan Geoscience Union Meeting 2024

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[PPS05-P07]Tides on Mercury with a Deep Solid-Liquid Mixed Layer

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