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Indirect detection experiments typically measure the flux of annihilatingdark matter (DM) particles propagating freely through galactic halos. Weconsider a new scenario where celestial bodies "focus" DM annihilation events,increasing the efficiency of halo annihilation. In this setup, DM is firstcaptured by celestial bodies, such as neutron stars or brown dwarfs, and thenannihilates within them. If DM annihilates to sufficiently long-livedparticles, they can escape and subsequently decay into detectable radiation.This produces a distinctive annihilation morphology, which scales as theproduct of the DM and celestial body densities, rather than as DM densitysquared. We show that this signal can dominate over the halo annihilation ratein $\gamma$-ray observations in both the Milky Way Galactic center and globularclusters. We use \textit{Fermi} and H.E.S.S. data to constrain the DM-nucleonscattering cross section, setting powerful new limits down to$\sim10^{-39}~$cm$^2$ for sub-GeV DM using brown dwarfs, which is up to nineorders of magnitude stronger than existing limits. We demonstrate that neutronstars can set limits for TeV-scale DM down to about $10^{-47}~$cm$^2$.

Celestial-Body Focused Dark Matter Annihilation Throughout the Galaxy