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Mercury formAtion by Giant iMpact during Accretion: mass transfer, metal-silicate re-equilibration, and magma oceans

Project description

Modelling the origins of Mercury’s unique structure

The existence of the Moon and evidence of intense cratering on the Moon, Mars and Mercury suggest that violent cosmic collisions were instrumental in shaping the development, interior composition and surface features of rocky planets. Mercury’s exceptionally large iron core also suggests that a massive impact may have stripped away its mantle during accretion. Supported by the Marie Skłodowska-Curie Actions programme, the MAGMA project will explore this impact hypothesis, aiming to determine Mercury’s thermodynamic and chemical evolution. By combining laboratory experiments on post-impact element behaviour with shock-physics simulations, MAGMA will analyse metal-silicate re-equilibration and mass transfer within planetary magma oceans. It will compare its findings with actual spacecraft observations from the current ESA-JAXA BepiColombo mission to Mercury.

Objective

"High-energy collisions shaped planetary growth, internal structures, and surfaces. Evidence includes the cratered Moon, Mars, and Mercury; the likely impact origin of Earth’s and Mars’ moons; and metal meteorites from destroyed differentiated bodies. Mercury’s unusually large core may also reflect mantle stripping during a giant impact. Interest in Mercury has strongly increased in recent years, notably with the ESA-JAXA BepiColombo mission. Yet the giant impact hypothesis has never been tested in terms of thermochemical evolution.
In this context, the applicant has designed ""MAGMA"", a project to reassess how such an event shaped Mercury and test its viability. The project will explore thermodynamic and chemical outcomes of candidate impacts, focusing on melt production and volatile partitioning between core and mantle materials from both impactor and target—key to Mercury’s thermal and chemical evolution and to interpreting BepiColombo data. Given Mercury’s particularly large core, even small differences in volatile content strongly affect its mass and measured gravity field. The work combines shock-physics simulations with laboratory experiments on element behavior under post-impact conditions, compared to spacecraft data. It merges the applicant’s expertise with an innovative experimental campaign, new to the applicant, requiring host infrastructure and supervisor expertise. Ultimately, MAGMA will assess the uniqueness of Mercury in light of the growing discovery of super-Mercury exoplanets.
Beyond Mercury, the project will advance understanding of how giant impacts shape the diversity of rocky planets, including Earth. Its interdisciplinary approach will provide new tools to link geochemical signatures to dynamical histories. Results will directly benefit interpretation of ongoing missions and exoplanet observations, offering a framework to understand how extreme collisional events shape planetary systems."

Keywords

Programme(s)

Topic(s)

Funding Scheme

HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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Call for proposal

(opens in new window) HORIZON-MSCA-2025-PF

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Coordinator

KATHOLIEKE UNIVERSITEIT LEUVEN
Net EU contribution
€ 200 400,00
Address
OUDE MARKT 13
3000 Leuven
Belgium
Region
Vlaams Gewest Prov. Vlaams-Brabant Arr. Leuven
Activity type
Higher or Secondary Education Establishments
Links
Total cost
No data