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We study the properties of jets launched by a neutron star spiralling insidethe envelope and core of a red supergiant. We propose that Thorne-Zytkowobjects (TZO) are unlikely to be formed via common envelope (CE) evolution ifaccretion on to the neutron star can exceed the Eddington rate with much of theaccretion energy directed into jets that subsequently dissipate within thegiant envelope. We use the jet-feedback mechanism, where energy deposited bythe jets drives the ejection of the entire envelope and part of the core, andfind a very strong interaction of the jets with the core material at latephases of the CE evolution. Following our results we speculate on two rareprocesses that might take place in the evolution of massive stars. (1) Recentstudies have claimed that the peculiar abundances of the HV2112 RSG star can beexplained if this star is a TZO. We instead speculate that the rich-calciumenvelope comes from a supernova explosion of a stellar companion that was onlyslightly more massive than HV2112, such that during its explosion HV2112 wasalready a giant that intercepted a relatively large fraction of the SN ejecta.(2) We raise the possibility that strong r-process nucleosynthesis, whereelements with high atomic weight of $A \ga 130$ are formed, occurs inside thejets that are launched by the NS inside the core of the RSG star.

Ejecting the envelope of red supergiant stars with jets launched by an inspiraling neutron star