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- W2892025726 abstract "Super-Earths are extremely common among the numerous exoplanets that have been discovered. The high pressures and temperatures in their interiors are likely to lead to long-lived magma oceans. If their electrical conductivity is sufficiently high, the mantles of Super-Earth would generate their own magnetic fields. With ab initio simulations, we show that upon melting, the behavior of typical mantle silicates changes from semi-conducting to semi-metallic. The electrical conductivity increases and the optical properties are substantially modified. Melting could thus be detected with high-precision reflectivity measurements during the short time scales of shock experiments. We estimate the electrical conductivity of mantle silicates to be of the order of 100 Ω-1 cm-1, which implies that a magnetic dynamo process would develop in the magma oceans of Super-Earths if their convective velocities have typical values of 1 mm/s or higher. We predict exoplanets with rotation periods longer than 2 days to have multipolar magnetic fields." @default.
- W2892025726 created "2018-09-27" @default.
- W2892025726 creator A5023169746 @default.
- W2892025726 creator A5030583683 @default.
- W2892025726 date "2018-09-24" @default.
- W2892025726 modified "2023-09-30" @default.
- W2892025726 title "Electrical conductivity and magnetic dynamos in magma oceans of Super-Earths" @default.
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- W2892025726 doi "https://doi.org/10.1038/s41467-018-06432-6" @default.
- W2892025726 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6155165" @default.
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