Dissociation of CaIrO3-type MgSiO3 in the gas giants

Details Dissociation of CaIrO3-type MgSiO3 in the gas giants Dissociation of CaIrO3-type MgSiO3 in the gas giants

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aps..marp42001u&link_type=abstract

American Physical Society, APS March Meeting, March 13-17, 2006, abstract #P42.001

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CaIrO3-type MgSiO3 is the planet-forming silicate stable at pressures and temperatures (PTs) beyond those of Earth's core-mantle boundary. We have found using first principles quasiharmonic free energy computations that this mineral dissociates into MgO and SiO2 at PTs expected to occur in the cores of the gas giants (>˜10 Mbar, 10,000 K). This transformation should be important also for modeling the internal structure of two recently discovered terrestrial exoplanets: a dense Saturn orbiting HD149026b and a super Earth orbiting GJ876d. We propose a low pressure route experiment to confirm this dissociation.

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