Effect of improved atmospheric opacities in modelling sub-Neptunes

Aims. We investigate the impact of updated atmospheric mean opacity input values on modelled transit radius and distribution interior layer mass fractions. Methods. developed applied a coupled interior-atmosphere model. Our straightforward semi-grey calculation temperature enables us to perform thousands model realisations in Monte Carlo approach address potential degeneracies fraction. main constraints are planetary from which our infers distributions internal structure exoplanetary classes ranging Super-Earth Mini-Neptune. varied relative masses gas, envelope, mantle, core layers subject bulk density observations, investigated effect updating opacities. Results. First, we validate output with observed profiles for modern Neptune. can reproduce basic features middle atmosphere but not inversion upper layers, is likely because lacks aerosol heating. Calculated interiors generally consistent Second, compare well-studied object GJ 1214 b obtain results that broadly previous findings; they suggest correlations between water, fractions, although these weak. Updating opacities leads change order few percent radius. This comparable magnitude planned accuracy PLATO data radius, suggesting update important implement.