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Galactic evolution of rapid neutron capture process abundances: the inhomogeneous approach

Wehmeyer, B. and Pignatari, M. and Thielemann, F. -K.. (2015) Galactic evolution of rapid neutron capture process abundances: the inhomogeneous approach. Monthly Notices of the Royal Astronomical Society (MNRAS), 452 (2). pp. 1970-1981.

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Official URL: http://edoc.unibas.ch/41638/

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Abstract

For the origin of heavy rapid neutron capture process (r-process) elements, different sources have been proposed, e.g. core-collapse supernovae or neutron star mergers. Old metal-poor stars carry the signature of the astrophysical source(s). Among the elements dominantly made by the r-process, europium (Eu) is relatively easy to observe. In this work we simulate the evolution of Eu in our Galaxy with the inhomogeneous chemical evolution (ICE) model, and compare our results with spectroscopic observations. We test the most important parameters affecting the chemical evolution of Eu: (a) for neutron star mergers the coalescence time-scale of the merger (tcoal) and the probability to experience a neutron star merger event after two supernova explosions occurred and formed a double neutron star system (PNSM) and (b) for the subclass of magnetorotationally driven supernovae (‘Jet-SNe’), their occurrence rate compared to standard supernovae (PJet-SN). We find that the observed [Eu/Fe] pattern in the Galaxy can be reproduced by a combination of neutron star mergers and Jet-SNe as r-process sources. While neutron star mergers alone seem to set in at too high metallicities, Jet-SNe provide a cure for this deficiency at low metallicities. Furthermore, we confirm that local inhomogeneities can explain the observed large spread in the Eu abundances at low metallicities. We also predict the evolution of [O/Fe] to test whether the spread in α-elements for inhomogeneous models agrees with observations and whether this provides constraints on supernova explosion models and their nucleosynthesis.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Thielemann, Friedrich-Karl and Wehmeyer, Benjamin and Pignatari, Marco
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:The Royal Astronomical Society
ISSN:1365-2966
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Jun 2016 11:02
Deposited On:18 May 2016 14:36

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