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The common envelop jet supernovae (CEJSN) r-process scenario has beenproposed as an r-process nucleosynthesis site in the past decade. Jets launchedby a neutron star that spirals-in inside the core of a red supergiant star in acommon envelope evolution supply the proper conditions for the formation ofelements heavier than iron through the rapid neutron capture process. Thepresent work initially unveils the r-process abundance patterns that resultfrom the density profile in the relatively long-lived jets. The resultsindicate that the CEJSN r-process scenario can produce the largest ratio of thethird r-process peak elements to Lanthanides among current r-process scenarios,and in addition can form quite an amount of Lanthanides in a single event. Thecomparison of the ratio of the third peak elements to the Lanthanides with anumber of observed r-enhanced metal-poor stars and with other r-processscenarios suggests that a high mass of third peak elements is anti-correlatedwith high fraction of Lanthanides, both in observations and theory. The CEJSNr-process scenario plays a significant role in this conclusion, since itreproduces the observational features of some particular r-enhanced metal-poorstars where other r-process scenarios encounter problems. Due to the formationof extremely heavy elements, the CEJSN also offers a credible estimation on theage of the most Actinide boosted star by cosmochronometry.

Robust r-process Nucleosynthesis Beyond Lanthanides in the Common Envelop Jet Supernovae