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A black hole (BH) hyperaccretion system might be born after the merger of aBH and a neutron star (NS) or a binary NS (BNS). In the case of a high massaccretion rate, the hyperaccretion disk is in a state of neutrino-dominatedaccretion flow (NDAF) and emits numerous anisotropic MeV neutrinos. Only asmall fraction of these neutrinos annihilates in the space outside of the diskand then launch ultrarelativistic jets that break away from the merger ejectato power gamma-ray bursts. Mergers and their remnants are generally consideredsources of gravitational waves (GWs), neutrinos, and kilonovae. Anisotropicneutrino emission and anisotropic high-velocity material outflows from centralBH-NDAF systems can also trigger strong GWs and luminous disk-outflow-driven(DOD) kilonovae, respectively. In this paper, the anisotropic multimessengersignals from NDAFs with outflows, including DOD kilonovae, MeV neutrinos, andGWs, are presented. As the results, the typical AB magnitude of the DODkilonovae is lower than that of AT 2017gfo at the same distance, and itdecreases with increasing viewing angles and its anisotropy is not sensitive tothe outflow mass distribution but mainly determined by the velocitydistribution. Since neutrinos with $\gtrsim 10~\rm MeV$ are mainly produced inthe inner region of the disk, they will be dramatically deflected to a largeviewing angle by relativity effects. Moreover, the strains of GWs induced byanisotropic neutrinos increase with increasing viewing angles. The accumulationof multimessenger detection of the BH-NS/BNS mergers with different viewingangles might further verify the existence of NDAFs with outflows.

Anisotropic multimessenger signals from black hole neutrino-dominated accretion flows with outflows in binary compact object mergers