Phase properties of dilute mixtures of helium in near critical mercury

Hensel, F.

doi:10.1016/s0022-3093(99)00314-2

Cited by 1 publication

(1 citation statement)

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“…These H/He mixtures are challenging because even the relatively small amount of helium involved is thought to greatly impact the EOS. Specifically, the insulator-to-metal transition that occurs at o(100) GPa pressures in pure H (Morales et al 2010;Lorenzen et al 2010) is thought to be suppressed to even higher pressures and temperatures with the inclusion of trace amounts of He (Hensel 1999).…”

Section: Hydrogenmentioning

confidence: 99%

Mass-Radius Relationships for Exoplanets

Swift

Eggert

Hicks

et al. 2011

ApJ

151

100

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For planets other than Earth, particularly exoplanets, interpretation of the composition and structure depends largely on comparing the mass and radius with the composition expected given their distance from the parent star. The composition implies a mass-radius relation which relies heavily on equations of state calculated from electronic structure theory and measured experimentally on Earth. We lay out a method for deriving and testing equations of state, and deduce mass-radius and mass-pressure relations for key, relevant materials whose equation of state is reasonably well established, and for differentiated Fe/rock.We find that variations in the equation of state, such as may arise when extrapolating from low pressure data, can have significant effects on predicted massradius relations, and on planetary pressure profiles. The relations are compared with the observed masses and radii of planets and exoplanets, broadly supporting recent inferences about exoplanet structures. Kepler-10b is apparently 'Earthlike,' likely with a proportionately larger core than Earth's, nominally 2/3 of the mass of the planet. CoRoT-7b is consistent with a rocky mantle over an Fe-based core which is likely to be proportionately smaller than Earth's. GJ 1214b lies between the mass-radius curves for H 2 O and CH 4 , suggesting an 'icy' composition with a relatively large core or a relatively large proportion of H 2 O. CoRoT-2b is less dense than the hydrogen relation, which could be explained by an anomalously high degree of heating or by higher than assumed atmospheric opacity.HAT-P-2b is slightly denser than the mass-radius relation for hydrogen, suggesting the presence of a significant amount of matter of higher atomic number.CoRoT-3b lies close to the hydrogen relation. The pressure at the center of Kepler-10b is 1.5 +1.2 −1.0 TPa. The central pressure in CoRoT-7b is probably close to 0.8 TPa, though may be up to 2 TPa. These pressures are accessible by pla--3nar shock and ramp loading experiments at large laser facilities. The center of HAT-P-2b is probably around 210 TPa, in the range of planned National Ignition Facility experiments, and that of CoRoT-3b around 1900 TPa.

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Section: Hydrogenmentioning

confidence: 99%