Classification of exoplanets according to density

Considering probability distribution as a function of the average density $\barρ$ computed for 424 extrasolar planets we identify three log-normal Gaussian population components. The two most populous components at $\barρ\simeq0.7$ g/cc and $\barρ\simeq7$ g/cc are the ice/gas giants and iron/rock super-Earths, respectively. A third component at $\barρ\simeq30$ g/cc is consistent with brown dwarfs, i.e., electron degeneracy supported objects. We note presence of several extreme density planetary objects.

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