Energy-limited atmospheric escape ($\dot{M}=\eta \pi R_{\mathrm{EUV}}^2{F}_{\mathrm{EUV}}{R}_p/(G{M}_p)$)

Energy-limited atmospheric escape equates a fraction $\eta$ of absorbed high-energy stellar power to the gravitational work needed to remove gas. Ignoring tidal and cooling corrections gives $\dot{M}=\eta \pi R_{\mathrm{EUV}}^2{F}_{\mathrm{EUV}}{R}_p/(G{M}_p)$.