Planetary equilibrium temperature versus planetary density for targets with Hα observations. Detections are shown in blue, with non-detections in red; the three targets considered here are shown as colored stars (outline for detection/nondetection). This plot suggests the major deciding factor is low ρ and high T_eq more than age. However, age and density are correlated as <200 Myr planets planets are known to be puffier than their older counterparts (S. Vach et al. 2024).