Nucleosynthesis of r-Process Elements by Jittering Jets in Core-Collapse Supernovae

Abstract

We calculate the nucleosynthesis inside the hot bubble formed in the jittering-jets model for core collapse supernovae (CCSNe) explosions, and find the formation of several times 10^-4 M_\odot of r-process elements. In the jittering-jets model fast jets launched from a stochastic accretion disk around the newly formed neutron star are shocked at several thousands km, and form hot high-pressure bubbles. These bubbles merge to form a large bubble that explode the star. In the current study we assume a spherically symmetric homogenous bubble, and follow its evolution for about one second during which nuclear reactions take place. The jets last for about one second, their velocity is v_j=0.5c, and their total energy is 10^51 erg. We use jets' neutron enrichment independent on time, and follow the nuclear reactions to the formation of the seed nuclei up to $Z\le 50$, on which more neutrons will be absorbed to form the r-process elements. Based on the mass of the seed nuclei we find the r-process element mass in our idealized model to be several times 10^-4 M_\odot, which is slightly larger than the value deduced from observations. More realistic calculations that relax the assumptions of a homogenous bubble and constant jets composition might lead to agreement with observations.

Accepted for publication in MNRAS

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• Magnetar-powered superluminous supernovae must first be exploded by jets
• The common envelope jets supernova (CEJSN) r-process scenario
• A Planar Jitternig-Jets Pattern in Core-Collapse Supernova Explosions
• A call for a paradigm shift from neutrino-driven to jet-driven core-collapse supernova mechanisms
• Angular momentum fluctuations in the convective helium shell of massive stars
• Operation of the jet feedback mechanism (JFM) in intermediate luminosity optical transients (ILOTs)
• Exploding Core-Collapse Supernovae by Jets-Driven Feedback Mechanism
• Low energy core collapse supernovae in the frame of the jittering jets explosion mechanism
• A mixed helium-oxygen shell in some core-collapse supernova progenitors