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We study MeV-scale electrophilic Feebly Interacting Particles (FIPs), thatmay be abundantly produced in Supernova (SN) explosions, escape the star anddecay into electrons and positrons. This exotic injection of leptons in theMilky Way leaves an imprint in both photon and cosmic-ray fluxes. Specifically,positrons lose energy and annihilate almost at rest with background electrons,producing photons with $511$ keV energy. In addition, electrons and positronsradiate photons through bremsstrahlung emission and upscatter the low-energygalactic photon fields via the inverse Compton process generating a broademission from X-ray to $\gamma$-ray energies. Finally, electrons and positronsare directly observable in cosmic ray experiments. In order to describe theFIP-induced lepton injection in full generality, we use a model independentparametrization which can be applied to a host of FIPs such as axion-likeparticles, dark photons and sterile neutrinos. Theoretical predictions arecompared to experimental data to robustly constrain FIP-electron interactionswith an innovative multimessenger analysis.

Multimessenger search for electrophilic feebly interacting particles from supernovae