Benjamin Wehmeyer
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View article: Can We Draw Conclusions on Supernova Shock Wave Propagation Using Short‐Lived Radioactive Isotopes?
Can We Draw Conclusions on Supernova Shock Wave Propagation Using Short‐Lived Radioactive Isotopes? Open
We run a three‐dimensional Galactic chemical evolution (GCE) model to follow the propagation of 53 Mn (exclusively produced from type Ia supernovae, SNIa), 60 Fe (exclusively produced from core‐collapse supernovae, CCSNe), 182 Hf (exclusiv…
View article: The aluminium-26 distribution in a cosmological simulation of a Milky Way-type Galaxy
The aluminium-26 distribution in a cosmological simulation of a Milky Way-type Galaxy Open
Context . The 1.8 MeV γ -rays corresponding to the decay of the radioactive isotope 26 Al (with a half-life of 0.72 Myr ) have been observed by the SPI detector on the INTEGRAL spacecraft and extensively used as a tracer of star formation …
View article: Galactic chemical evolution with the short-lived isotopes <sup>53</sup>Mn, <sup>60</sup>Fe, <sup>182</sup>Hf, and <sup>244</sup>Pu
Galactic chemical evolution with the short-lived isotopes <sup>53</sup>Mn, <sup>60</sup>Fe, <sup>182</sup>Hf, and <sup>244</sup>Pu Open
We run a three-dimensional Galactic chemical evolution (GCE) model to follow the propagation of 53 Mn from supernovae of type Ia (SNIa), 60 Fe from core-collapse supernovae (CCSNe), 182 Hf from intermediate mass stars (IMSs), and 244 Pu fr…
View article: Galactic Chemical Evolution with the short lived radioisotopes \(^{53}\textbf{Mn}\), \(^{60}\textbf{Fe}\), \(^{182}\textbf{Hf}\), and \(^{244}\textbf{Pu}\)
Galactic Chemical Evolution with the short lived radioisotopes \(^{53}\textbf{Mn}\), \(^{60}\textbf{Fe}\), \(^{182}\textbf{Hf}\), and \(^{244}\textbf{Pu}\) Open
Modelling the Galactic chemical evolution (GCE) of short-lived radioisotopes (SLRs, with half-lives of the order of million years) can provide timing information on recent nucleosynthesis. The knowledge of their spatial distribution throug…
View article: Inhomogeneous Enrichment of Radioactive Nuclei in the Galaxy: Deposition of Live <sup>53</sup>Mn, <sup>60</sup>Fe, <sup>182</sup>Hf, and <sup>244</sup>Pu into Deep-sea Archives. Surfing the Wave?
Inhomogeneous Enrichment of Radioactive Nuclei in the Galaxy: Deposition of Live <sup>53</sup>Mn, <sup>60</sup>Fe, <sup>182</sup>Hf, and <sup>244</sup>Pu into Deep-sea Archives. Surfing the Wave? Open
While modeling the galactic chemical evolution (GCE) of stable elements provides insights to the formation history of the Galaxy and the relative contributions of nucleosynthesis sites, modeling the evolution of short-lived radioisotopes (…
View article: Inhomogeneous enrichment of radioactive nuclei in the Galaxy: Deposition of live Mn-53, Fe-60, Hf-182, and Pu-244 into deep-sea archives. Surfing the wave?
Inhomogeneous enrichment of radioactive nuclei in the Galaxy: Deposition of live Mn-53, Fe-60, Hf-182, and Pu-244 into deep-sea archives. Surfing the wave? Open
While modelling the galactic chemical evolution (GCE) of stable elements provides insights to the formation history of the Galaxy and the relative contributions of nucleosynthesis sites, modelling the evolution of short-lived radioisotopes…
View article: Origin of Plutonium-244 in the Early Solar System
Origin of Plutonium-244 in the Early Solar System Open
We investigate the origin in the early Solar System of the short-lived radionuclide 244Pu (with a half life of 80 Myr) produced by the rapid (r) neutron-capture process. We consider two large sets of r-process nucleosynthesis models and an…
View article: The Radioactive Nuclei 26Al and 60Fe in the Cosmos and in the Solar System
The Radioactive Nuclei 26Al and 60Fe in the Cosmos and in the Solar System Open
The Author(s), 2021. Published by Cambridge University Press on behalf of the Astronomical Society of Australia. This is an Open Access article, distributed under the terms of the Creative Commons Attribution-Non Commercial-Share Alike lic…
View article: Radioactive isotopes: astrophysics answers in abundance
Radioactive isotopes: astrophysics answers in abundance Open
Radioactive isotopes: astrophysics answers in abundance The ERC Consolidator Grant project “RADIOSTAR: Radioactivities form Stars to Solar Systems” uses radioactive nuclei produced by nuclear reactions inside stars and supernovae to unders…
View article: The Radioactive Nuclei $^{\textbf{26}}$Al and $^{\textbf{60}}$Fe in the Cosmos and in the Solar System
The Radioactive Nuclei $^{\textbf{26}}$Al and $^{\textbf{60}}$Fe in the Cosmos and in the Solar System Open
The cosmic evolution of the chemical elements from the Big Bang to the present time is driven by nuclear fusion reactions inside stars and stellar explosions. A cycle of matter recurrently re-processes metal-enriched stellar ejecta into th…
View article: <sup>129</sup> I and <sup>247</sup> Cm in meteorites constrain the last astrophysical source of solar r-process elements
<sup>129</sup> I and <sup>247</sup> Cm in meteorites constrain the last astrophysical source of solar r-process elements Open
The origin of r-process elements Theoretical models predict that the synthesis of heavy elements by the rapid neutron capture process (r-process) occurs in extreme astrophysical environments such as neutron star mergers or some types of su…
The radioactive nuclei and in the Cosmos and in the solar system Open
The cosmic evolution of the chemical elements from the Big Bang to the present time is driven by nuclear fusion reactions inside stars and stellar explosions. A cycle of matter recurrently re-processes metal-enriched stellar ejecta into th…
View article: r-Process Sites, their Ejecta Composition, and their Imprint in Galactic Chemical Evolution
r-Process Sites, their Ejecta Composition, and their Imprint in Galactic Chemical Evolution Open
From low metallicity stars and the presence of radioactive isotopes in deep-sea sediments we know that the main r-process, producing the heaviest elements, is a rare event. The question remains whether neutron star mergers, via GW170817 th…
View article: Constraining the Rapid Neutron-Capture Process with Meteoritic I-129 and Cm-247
Constraining the Rapid Neutron-Capture Process with Meteoritic I-129 and Cm-247 Open
Meteoritic analysis demonstrates that radioactive nuclei heavier than iron were present in the early Solar System. Among them, $^{129}$I and $^{247}$Cm both have a rapid neutron-capture process ($r$ process) origin and decay on the same ti…
View article: Core-collapse Supernova Explosions Driven by the Hadron-quark Phase Transition as a Rare r-process Site
Core-collapse Supernova Explosions Driven by the Hadron-quark Phase Transition as a Rare r-process Site Open
Supernova explosions of massive stars are one of the primary sites for the production of the elements in the universe. Up to now, stars with zero-age main-sequence masses in the range of 35–50 M ⊙ had mostly represented the failed supernov…
View article: Could Failed Supernovae Explain the High <i>r</i>-process Abundances in Some Low Metallicity Stars?
Could Failed Supernovae Explain the High <i>r</i>-process Abundances in Some Low Metallicity Stars? Open
Rapid neutron capture process (r-process) elements have been detected in a large number of metal-poor halo stars. The observed large abundance scatter in these stars suggests that r-process elements have been produced in a site that is rar…
View article: Using failed supernovae to constrain the Galactic r-process element production
Using failed supernovae to constrain the Galactic r-process element production Open
Rapid neutron capture process (r-process) elements have been detected in a large fraction of metal-poor halo stars, with abundances relative to iron (Fe) that vary by over two orders of magnitude. This scatter is reduced to less than a fac…
View article: Neutron Star Mergers and Nucleosynthesis of Heavy Elements
Neutron Star Mergers and Nucleosynthesis of Heavy Elements Open
The existence of neutron star mergers has been supported since the discovery of the binary pulsar and the observation of its orbital energy loss, consistent with General Relativity. They are considered nucleosynthesis sites of the rapid ne…
View article: Observing the metal-poor solar neighbourhood: a comparison of galactic chemical evolution predictions*†
Observing the metal-poor solar neighbourhood: a comparison of galactic chemical evolution predictions*† Open
© 2017 The Authors. Atmospheric parameters and chemical compositions for 10 stars with metallicities in the region of -2.2 < [Fe/H] < -0.6 were precisely determined using high-resolution, high signal-tonoise, spectra. For each star, the ab…
View article: Inhomogeneous Chemical Evolution of r-process Elements in the Galactic Halo
Inhomogeneous Chemical Evolution of r-process Elements in the Galactic Halo Open
For the production of r-process elements in our Galaxy, multiple sites have been discussed, among others, core-collapse supernovae and neutron star mergers. We use the observed elemental abundances of europium (Eu) in metal poor stars to r…
View article: Advanced LIGO Constraints on Neutron Star Mergers and r-process Sites
Advanced LIGO Constraints on Neutron Star Mergers and r-process Sites Open
The role of compact binary mergers as the main production site of r-process elements is investigated by combining stellar abundances of Eu observed in the Milky Way, galactic chemical evolution (GCE) simulations, and binary population synt…
View article: Inhomogeneous chemical evolution of r-process elements
Inhomogeneous chemical evolution of r-process elements Open
We report the results of a galactic chemical evolution (GCE) study for r-process- and alpha elements. For this work, we used the inhomogeneous GCE model "ICE", which allows to keep track of the galactic abundances of elements produced by d…
View article: Modelling of the galactic chemical evolution of r-process elements
Modelling of the galactic chemical evolution of r-process elements Open
Are we made of star dust? This question which already guided me during my
\nmaster studies could be a good motivation to justify the efforts taken in this
\nwork.
\nThe Big Bang made space itself and time itself. Also, a lot of energy was
…
View article: Galactic evolution of rapid neutron capture process abundances: the inhomogeneous approach
Galactic evolution of rapid neutron capture process abundances: the inhomogeneous approach Open
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…