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In this work we demonstrate that Dark Matter (DM) evaporation severelyhinders the effectiveness of exoplanets and Brown Dwarfs as sub-GeV DM probes.Moreover, we find useful analytic closed form approximations for DM capturerates for arbitrary astrophysical objects, valid in four disticnt regions inthe $\sigma-m_X$ parameter space. As expected, in one of those regions the DarkMatter capture saturates to its geometric limit, i.e. the entire flux crossingan object. As a consequence of this region, which for many objects falls withinthe parameter space not excluded by direct detection experiments, we point outthe existence of a DM parameter dependent critical temperature ($T_{crit}$),above which astrophysical objects lose any sensitivity as Dark Matter probes.For instance, Jupiters at the Galactic Center have a $T_{crit}$ ranging from$700$ K (for a $3 M_J$ Jupiter) to $950$ K (for $14 M_J$). This limitation israrely (if ever) considered in the previous literature of indirect Dark Matterdetection based on observable signatures of captured Dark Matter insidecelestial bodies.

The effectiveness of exoplanets and Brown Dwarfs as sub-GeV Dark Matter detectors