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We conduct three-dimensional hydrodynamical simulations of eccentric commonenvelope jets supernova (CEJSN) impostors, i.e., a neutron star (NS) thatcrosses through the envelope of a red supergiant star on a highly eccentricorbit and launches jets as it accretes mass from the envelope. Because ofnumerical limitations we apply a simple prescription where we inject theassumed jets' power into two opposite conical regions inside the envelope. Wefind the outflow morphology to be very complicated, clumpy, and non-spherical,having a large-scale symmetry only about the equatorial plane. The outflowmorphology can substantially differ between simulations that differ by theirjets' power. We estimate by simple means the light curve to be very bumpy, tohave a rise time of one to a few months, and to slowly decay in about a year toseveral years. These eccentric CEJSN impostors will be classified as `gap'objects, i.e., having a luminosity between those of classical novae and typicalsupernovae (termed also ILOTs for intermediate luminosity optical transients).We strengthen a previous conclusion that CEJSN impostors might account for somepeculiar ILOTs, in particular those that might repeat over timescales of monthsto years.

Simulating highly-eccentric common envelope jets supernova (CEJSN) impostors