Rocky Exoplanets with Four to Six Times Earth’s Mass Have Longest Dynamos, Study Suggests physics planetaryscience space science
In new research, a team of scientists from the Lawrence Livermore National Laboratory and elsewhere used high-energy lasers at the National Ignition Facility and X-ray diffraction to determine the iron-melt curve up to a pressure of 1,000 gigapascals , three times the pressure of Earth’s inner core and nearly four times greater pressure than any previous experiments.
“The iron melting curve is critical to understanding the internal structure, thermal evolution, as well as the potential for dynamo-generated magnetospheres.” With the prominence of iron in terrestrial planets, accurate and precise physical properties at extreme pressure and temperatures are required to predict what is happening within their interiors.
“We find that terrestrial exoplanets with four to six times Earth’s mass will have the longest dynamos, which provide important shielding against cosmic radiation,” Dr. Kraus said.
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