A Common Envelope Jets Supernova (CEJSN) Impostor Scenario for Fast Blue Optical Transients

Abstract I propose a new scenario, the polar common envelope jets supernova (CEJSN) impostor to account for AT2018cow-like fast blue optical transients (FBOTs). The CEJSN scenario evolves through four main phases. (1) A red supergiant (RSG) star expands tidally interact with neutron (NS) companion (or black hole). interaction increases RSG mass loss rate form circumstellar matter (CSM) halo r ≃ 0.1 pc. (2) Shortly before onset of evolution (CEE) and about year explosion NS accretes from launches that inflate two opposite lobes in CSM within ≈100 au. (3) NS-RSG system enters CEE phase during which ejects most dense equatorial outflow. (4) At termination leftover forms circumbinary disk around NS-core system. energetic that, when colliding fronts lobes, power an FBOT event. low jets-lobes zones their large distance, 100 au, center transient. In future core collapses second NS. far NSs might merge. suggest FBOTs similar are impostors compose fraction progenitors NS-NS merger binaries.