Physics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2903g&link_type=abstract
American Astronomical Society, DPS meeting #39, #29.03; Bulletin of the American Astronomical Society, Vol. 39, p.467
Physics
Scientific paper
To the date of this writing, 19 extrasolar planets in transit are known and characterized with enough accuracy to allow constraining their composition from the measurements of their mass and radius. Among these, several (of order 5) appear to be anomalously large: they cannot be explained by the standard evolution of a solar composition giant planet. This asks for a missing physical ingredient (an extra energy source, for example tidal heating due to weather noise, or increased interior opacities). I will show that with reasonnable assumptions on this missing physics, one can explain with the same hypotheses the sizes of ALL transiting planets by allowing for the presence of a variable mass in heavy elements. In this case the mass of heavy elements in the planets appears to be correlated with the metallicity of their parent stars. The stars that are the most metal-rich host the most "metal"-rich planets, with masses of heavy elements of order 50 to 100 Earth masses.
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