Geochemistry study suggests the interiors of some exoplanets are very similar to that of Earth.
."White dwarf stars are the last known phase of stellar evolution for sun-like stars. When a star like the sun dies, it evolves into a white dwarf. This evolution can be very chaotic for the planetary system surrounding the star, and as the star expands and contracts the smaller bodies orbiting the star will change trajectories, which can send some of them towards the star, thus causing eventual trapping of the rocky material by the white dwarf.
In the study, the team looked at six white dwarfs and rocks from the planets that once orbited it."The geochemistry and geophysics of interiors of exoplanets are crucial, because they can determine important parameters for habitability of a planet, such as, whether or not it has a magnetic field, what the atmosphere will look like and the existence of plate tectonics," Doyle said.
"For rocky exoplanets in general, we are finding that rocks forming around other stars are geochemically similar to most of the rocky bodies in the Solar System. We are seeing that rocks are rocks, even when they form around other stars."
France Dernières Nouvelles, France Actualités
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