ERC project "IMPACT" by Razvan Caracas



Field: Geophysics

Research: The giant impact and the Earth and Moon formation

Very little is understood of the physics governing the Giant Impact and the subsequent formation of the Moon. According to this model an impactor hit the proto-Earth; the resulting energy was enough to melt and partially vaporize the two bodies generating a large protolunar disk, from which the Earth-Moon couple formed. Hydrodynamic simulations of the impact and the subsequent evolution of the protolunar disk are currently based on models of equations of state and phase diagrams that are unconstrained by experiments or calculations. Estimates of the positions of critical points, when available at all, vary by one order of magnitude in both temperature and density. Here we propose to compute the thermodynamics of the major rock-forming minerals and rock aggregates, and use it to study the formation and evolution of the protolunar disk. For this we employ a unique combination of atomistic state-of-the-art ab initio simulations. We use large-scale density-functional theory (DFT) molecular dynamics to study bulk fluids, coupled with Green functions (GW) and time-dependent DFT techniques to analyze atomic clusters and molecular species. We compute the vaporization curves, position the supercritical points, and characterize the sub-critical and supercritical regimes. We construct equations of state of the rocks at the conditions of the giant impact that are beyond current experimental capabilities. We employ a multiscale approach to bridge the gap between atomic, geological sample, and planetary scales via thermodynamics; we simulate the thermal profile through the disk, the ratio between liquid and vapor, and the speciation. From speciation we predict elemental and isotopic partitioning during condensation. Plausible impact scenarios, features of the impactor and of the proto-Earth will be constrained with a feedback loop, until convergence between predictions of final Earth-Moon compositions and observations is reached.

Max ERC Funding

1 900 000 €


Start date: 2016-09-01, End date: 2021-08-31

ERC Consolidator Grant

ERC Consolidator Grants support promising researchers who are at the beginning of an independent research career. The consolidation of their own research team will be funded with the grant. For the evaluation of the researcher profile several benchmarks according to research domain and career development are taken into account. For instance, applicants should have several important publications without their PhD supervisor. Other benchmarks include publications as first author in high-ranking international journals, (translated) monographs, patents, conference presentations or (inter)national prizes and awards.


Razvan CaracasRazvan Caracas

CNRS Research director at LGL-TPE

Razvan Caracas' home page