The p-Process in the Carbon Deflagration Model for Type Ia Supernovae and Chronology of the Solar System Formation

Abstract

We study nucleosynthesis of p‐nuclei in the carbon deflagration model for Type Ia supernovae (SNe Ia) by assuming that seed nuclei are produced by the s‐process in accreting layers on a carbon‐oxygen white dwarf during mass accretion from a binary companion. We find that about 50 % of the p‐nuclides are synthesized in proportion to the solar abundance and that p‐isotopes of Mo and Ru which are significantly underproduced in Type II supernovae (SNe II) are produced up to a level close to other p‐nuclei. Comparing the yields of iron and p‐nuclei in SNe Ia we find that SNe Ia can contribute to the galactic evolution of the p‐nuclei. Next, we consider nucleochronology of the solar system formation by using four radioactive nuclides and apply the result of the p‐process nucleosynthesis to simple galactic chemical evolution models. We find that when assumed three phases of interstellar medium are mixed by the interdiffusion with the timescale of about 40 Myr 53Mn/55Mn value in the early solar system is consistent with a meteoritic value. In addition, we put constraints to a scenario that SNe Ia induce the core collapse of the molecular cloud, which leads to the formation of the solar system.