Key points are not available for this paper at this time.
Context. The opacity due to grains in the envelope of a protoplanet κgr regulates the accretion rate of gas during formation, meaning that the final bulk composition of planets with a primordial H/He envelope is a function of that opacity. Observationally, for extrasolar planets with known mass and radius it is possible to estimate the bulk composition via internal structure models.
Mordasini et al. (2014) studied this question.