Heavy Elements Nucleosynthesis On Accreting White Dwarfs: building seeds for the p-process

Abstract

The origin of the proton-rich trans-iron isotopes in the solar system is still uncertain. Single-degenerate thermonuclear supernovae (SNIa) with n-capture nucleosynthesis seeds assembled in the external layers of the progenitor's rapidly accreting white dwarf phase may produce these isotopes. We calculate the stellar structure of the accretion phase of five white dwarf models with initial masses >~ 0.85Msun using the stellar code MESA. The near-surface layers of the 1, 1.26, 1.32 and 1.38Msun models are most representative of the regions in which the bulk of the p nuclei are produced during SNIa explosions, and for these models we also calculate the neutron-capture nucleosynthesis in the external layers. Contrary to previous rapidly-accreting white dwarf models at lower mass, we find that the H-shell ashes are the main site of n-capture nucleosynthesis. We find high neutron densities up to several 10^15 cm^-3 in the most massive WDs. Through the recurrence of the H-shell ashes these intermediate neutron densities can be sustained effectively for a long time leading to high neutron exposures with a strong production up to Pb. Both the neutron density and the neutron exposure increase with increasing the mass of the accreting WD. Finally, the SNIa nucleosynthesis is calculated using the obtained abundances as seeds. We obtain solar to super-solar abundances for p-nuclei with A>96. Our models show that SNIa are a viable p-process production site.

arXiv commentAccepted for publication in MNRAS. 49 pages, 17 figures, 5 tables

References in corpus (53)

• Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
• Low Temperature Opacities
• Observational clues to the progenitors of Type-Ia supernovae
• Nucleosynthesis in Massive Stars With Improved Nuclear and Stellar Physics
• The s Process: Nuclear Physics, Stellar Models, Observations
• Shell-model calculations of stellar weak interaction rates: II. Weak rates for nuclei in the mass range A=45-65 in supernovae environment
• The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
• Neutrino-induced nucleosynthesis of A>64 nuclei: The nu p-process
• Normal Type Ia supernovae from violent mergers of white dwarf binaries
• A Common Explosion Mechanism for Type Ia Supernovae
• Nuclear Level Density and the Determination of Thermonuclear Rates for Astrophysics
• The 12C(a,g)16O reaction and its implications for stellar helium burning
• S-factor of 14N(p,gamma)15O at astrophysical energies
• Thermal Stability of White Dwarfs Accreting Hydrogen-rich Matter and Progenitors of Type Ia Supernovae
• Convective-reactive proton-C12 combustion in Sakurai's object (V4334 Sagittarii) and implications for the evolution and yields from the first generations of stars
• NuGrid stellar data set I. Stellar yields from H to Bi for stars with metallicities Z = 0.02 and Z = 0.01
• Constraining Type Ia supernova models: SN 2011fe as a test case
• Hydrogen Burning on Accreting White Dwarfs: Stability, Recurrent Novae, and the Post-Novae Supersoft Source
• Type Ia Supernovae as Sites of p-process: Two-Dimensional Models Coupled to Nucleosynthesis
• The Role of Electron Captures in Chandrasekhar Mass Models for Type Ia Supernovae
• Thermally Stable Nuclear Burning on Accreting White Dwarfs
• s-Process Nucleosynthesis in Advanced Burning Phases of Massive Stars
• New Type Ia supernova Yields and the Manganese and Nickel Problems in the Milky Way and Dwarf Spheroidal Galaxies
• The bottleneck of the CNO burning and the age of the Globular Clusters
• i-process nucleosynthesis and mass retention efficiency in He-shell flash evolution of rapidly accreting white dwarfs
• He-Accreting WDs: accretion regimes and final outcomes
• Global non-spherical oscillations in 3-D $4\pi$ simulations of the H-ingestion flash
• New evolutionary calculations for the Born Again scenario
• Neutronization During Type Ia Supernova Simmering
• A New Estimation of Mass Accumulation Efficiency in Helium Shell Flashes toward Type Ia Supernova Explosions
• The i-process yields of rapidly-accreting white dwarfs from multicycle He-shell flash stellar evolution models with mixing parameterizations from 3D hydrodynamics simulations
• Convective-reactive nucleosynthesis of K, Sc, Cl and p-process isotopes in O-C shell mergers
• Role of core-collapse supernovae in explaining Solar System abundances of p nuclides
• MESA and NuGrid simulations of classical novae: CO and ONe nova nucleosynthesis
• Hybrid C-O-Ne white dwarfs as progenitors of type Ia supernovae: dependence on Urca process and mixing assumptions
• Survival of Nature's Rarest Isotope 180Ta under Stellar Conditions
• The impact of updated Zr neutron-capture cross sections and new asymptotic giant branch models on our understanding of the s process and the origin of stardust
• He-detonation in sub-Chandrasekhar CO white dwarfs: a new insight into energetics and p-process nucleosynthesis
• Production of the p-Process Nuclei in the Carbon-Deflagration Model for Type Ia Supernovae
• Testing the role of SNe Ia for Galactic chemical evolution of p-nuclei with 2D models and with s-process seeds at different metallicities
• He II recombination lines as a test of the nature of SN Ia progenitors in elliptical galaxies
• Uncertainties in the production of p nuclides in thermonuclear supernovae determined by Monte Carlo variations
• i-Process Contribution of Rapidly Accreting White Dwarfs to the Solar Composition of First-Peak Neutron-Capture Elements
• Observational constraints on the origin of the elements. III. Evidence for the dominant role of sub-Chandrasekhar SN Ia in the chemical evolution of Mn and Fe in the Galaxy
• Nucleosynthesis in 2D Core-Collapse Supernovae of 11.2 and 17.0 M${}_{\odot }$ Progenitors: Implications for Mo and Ru Production
• Optical tomography of chemical elements synthesized in Type Ia supernovae
• Origin of the p-process radionuclides 92Nb and 146Sm in the early Solar System and inferences on the birth of the Sun
• The born again (VLTP) scenario revisited: The mass of the remnants and implications for V4334 Sgr
• Diffuse Gas in Retired Galaxies: Nebular Emission Templates and Constraints on the Sources of Ionization
• Co-production of light p-, s- and r-process isotopes in the high-entropy wind of type II supernovae
• Uncertainties in $\nu$p-process nucleosynthesis from Monte Carlo variation of reaction rates
• Theoretical Studies of Accretion of Matter onto White Dwarfs and the Single Degenerate Scenario for Supernovae of Type Ia
• A Super-Eddington Wind Scenario for the Progenitors of Type Ia Supernovae

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