Derived constraints on the radius of KOI-423b as a function of age compared to evolution models. The dots represent solutions within 1σ (red), 2σ (orange), and 3σ of the inferred (Teff,ρ ⋆ ) obtained from stellar evolution models. From bottom to top, the lines correspond to evolution calculations for a hydrogen-helium brown dwarf with Y = 0.25 using a “standard” evolution model (black line), a model in which the greenhouse factor has been arbitrarily multiplied by 10 (purple line), and a model in which the atmospheric opacities have been arbitrarily multiplied by 10 (blue line).
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