Electrical conductivity and magnetic dynamos in magma oceans of Super-Earths

[SDU] Sciences of the Universe [physics] 0301 basic medicine 03 medical and health sciences 550 [SDU]Sciences of the Universe [physics] 13. Climate action Science Q 500 Article
DOI: 10.1038/s41467-018-06432-6 Publication Date: 2018-09-18T13:47:20Z
ABSTRACT
Abstract Super-Earths are extremely common among the numerous exoplanets that have been discovered. The high pressures and temperatures in their interiors likely to lead long-lived magma oceans. If electrical conductivity is sufficiently high, mantles of Super-Earth would generate own magnetic fields. With ab initio simulations, we show upon melting, behavior typical mantle silicates changes from semi-conducting semi-metallic. increases optical properties substantially modified. Melting could thus be detected with high-precision reflectivity measurements during short time scales shock experiments. We estimate order 100 Ω −1 cm , which implies a dynamo process develop oceans if convective velocities values 1 mm/s or higher. predict rotation periods longer than 2 days multipolar
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