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Using a one-dimensional stellar evolution code we simulate the response of ared supergiant (RSG) star to injection of energy and to mass removal. We takethe values of the energy that we inject and the mass that we remove accordingto our previous three-dimensional hydrodynamical simulations of a neutron star(NS) on a highly eccentric orbit that enters the envelope of an RSG star forhalf a year and launches jets as it accretes mass via an accretion disk. Wefind that for injected energies of ~1e47-1e48 erg and removed mass of~0.03-0.6Mo the RSG envelope expands to a large radius. Therefore, we expectthe NS to continue to orbit inside this massive inflated envelope for severalmore months, up to about twice the initial RSG radius, to continue to accretemass and launch jets for a prolonged period. Although these late jets areweaker than the jets that the NS launches while inside the original RSGenvelope, the late jets might actually be more influential on the light curve,leading to a long, several months to few years, and bright, about >10^8Lo,transient event. The RSG returns to more or less a relaxed structure afterabout ten years, and so another transient event might occur in the nextperiastron passage of the NS. Our results add to the already rich variety ofjet-driven explosions/outbursts that might account for many puzzling transientevents.

The response of a red supergiant to a common envelope jets supernova (CEJSN) impostor event