Heavy elements nucleosynthesis on accreting white dwarfs: building seeds for the p-process

Battino, U. and Pignatari, M. and Travaglio, C. and Lederer-Woods, C. and Denissenkov, P. and Herwig, F. and Thielemann, F. and Rauscher, T.. (2020) Heavy elements nucleosynthesis on accreting white dwarfs: building seeds for the p-process. Monthly Notices of the Royal Astronomical Society, 497 (4). pp. 4981-4998.

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Official URL: https://edoc.unibas.ch/80184/

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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 (RAWD) phase may produce these isotopes. We calculate the stellar structure of the accretion phase of five white dwarf (WD) models with initial masses >= 0.85 M-circle dot using the stellar code MESA The near-surface layers of the 1, 1.26, 1.32 and 1.38 M-circle dot 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 RAWD models at lower mass, we find that the H-shell flashes 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 flashes 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 supersolar abundances for p-nuclei with A > 96. Our models show that SNIa are a viable p-process production site.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas and Thielemann, Friedrich-Karl
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Oxford University Press
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:29 Apr 2021 13:07
Deposited On:29 Apr 2021 13:07

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