Neutron Star Mergers in Active Galactic Nucleus Accretion Disks: Cocoon and Ejecta Shock Breakouts

Neutron star mergers are believed to occur in accretion disks around supermassive black holes. Here we show that a putative jet launched from the merger of binary neutron (BNS) or star–black hole (NSBH) occurring at migration trap an active galactic nucleus (AGN) disk would be choked. The energy is deposited within materials power hot cocoon. cocoon energetic enough break out AGN and produce bright X-ray shock breakout transient peaking ?0.15 days after merger. peak luminosity estimated as , which can discovered by Einstein Probe . Later on, nonrelativistic ejecta disk, powering X-ray/UV flare ?0.5 This second signal may detected UV searches. cooling emission kilonova outshone difficult detect. Future joint observations gravitational waves BNS/NSBH associated two signatures provide strong support for compact coalescence formation channel disks.