Heat redistribution and planet radius mismatch for TOI-519 b. (a) Zero variability in the planetary light curve, but the eclipse is considered in the analysis; by including the eclipsing epochs in the VPIE analysis, the radius of the planet is tightly constrained. (b) Same as (a), but the T_night/T_day of the ground truth is 0.5. (c) Same as (a), but the eclipse is removed from the data before analysis. This case simulates a nontransiting planet; in the absence of an eclipse, the minimum ﹩{\chi }_{{\rm{red}}}^{2}﹩ is degenerate between heat redistribution and planet radius. At the true ∼R_J radius of TOI-519 b, moderate heat redistribution is rejected at 10σ. (d) Same as (c), but the T_night/T_day of the ground truth is 0.5. In each panel, the star indicates the ground truth used in calculating ﹩{\chi }_{{\rm{red}}}^{2}﹩ ✎.