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I propose a new scenario, the polar common envelope jets supernova (CEJSN)impostor scenario, to account for AT2018cow-like fast blue optical transients(FBOTs). The polar CEJSN impostor scenario evolves through four main phases.(1) A red supergiant (RSG) star expands to tidally interact with a neutron star(NS) companion (or a black hole). The interaction increases the RSG mass lossrate to form a circumstellar matter (CSM) halo to ~0.1pc. (2) Shortly beforethe onset of a common envelope evolution (CEE) and about a year beforeexplosion the NS accretes mass from the RSG envelope and launches jets thatinflate two opposite lobes in the CSM within ~100AU. (3) The NS-RSG systementers a CEE phase during which the system ejects most of the envelope mass ina dense equatorial outflow. (4) At the termination of the CEE the leftoverenvelope forms a circumbinary disk around the NS-core system. The NS accretesmass from the circumbinary disk and launches energetic jets that when collidewith the fronts of the CSM lobes power an FBOT event. The low mass of thejets-lobes interaction zones and their large distance, of about 100AU, from thecenter account for the fast transient. In the future the core collapses to forma second NS. In the far future the two NS might merge. I suggest that FBOTs andsimilar fast transients are CEJSN impostors which compose a large fraction ofthe progenitors of NS-NS merger binaries.

A common envelope jets supernova (CEJSN) impostor scenario for fast blue optical transients