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Secluded dark matter is one of the most popular dark matter models, wheredark matter annihilations go into particles that belong to a dark sector. Aninteresting way to probe such models is via indirect detection. In particular,gamma-ray observations are rather promising. Taking into account $1\%$ level ofsystematics, in this work we show that the Cherenkov Telescope Array (CTA) willplace the most stringent bounds on the dark matter annihilation cross section,surpassing existing probes based on H.E.S.S., Fermi-LAT, and Planck data, fordark matter masses above $400$ GeV, independently of the channel and choosingthe Einasto profile. We consider scenarios of secluded annihilations intoleptophilic, leptophobic scalars and Higgs-like particles being able to excludean annihilation cross section of $1.7 \times 10^{-25}$ cm$^3 \,$s$^{-1}$ for$m_{DM}=5000$ GeV, for $\phi \to e^+e^-$ channel, for example, exceeding thecurrent limits by one order of magnitude.

Secluded Dark Matter in light of the Cherenkov Telescope Array (CTA)