Neutrino-driven Outflows and the Elemental Abundance Patterns of Very Metal-poor Stars
The elemental abundances between strontium and silver ( Z = 38–47) observed in the atmospheres of very metal-poor stars in the Galaxy may contain the fingerprint of the weak r -process and ν p -process occurring in early core-collapse supernovae explosions. In this work, we combine various astrophys...
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad2dfb |
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| author | A. Psaltis M. Jacobi F. Montes A. Arcones C. J. Hansen H. Schatz |
| author_facet | A. Psaltis M. Jacobi F. Montes A. Arcones C. J. Hansen H. Schatz |
| author_sort | A. Psaltis |
| collection | DOAJ |
| description | The elemental abundances between strontium and silver ( Z = 38–47) observed in the atmospheres of very metal-poor stars in the Galaxy may contain the fingerprint of the weak r -process and ν p -process occurring in early core-collapse supernovae explosions. In this work, we combine various astrophysical conditions based on a steady-state model to cover the richness of the supernova ejecta in terms of entropy, expansion timescale, and electron fraction. The calculated abundances based on different combinations of conditions are compared with stellar observations, with the aim of constraining supernova ejecta conditions. We find that some conditions of the neutrino-driven outflows consistently reproduce the observed abundances of our sample. In addition, from the successful combinations, the neutron-rich trajectories better reproduce the observed abundances of Sr–Zr ( Z = 38–40), while the proton-rich ones, Mo–Pd ( Z = 42–47). |
| first_indexed | 2024-04-24T06:58:07Z |
| format | Article |
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| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-04-24T06:58:07Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj.art-db4c8797bc7f4473954657742c7630c62024-04-22T10:24:53ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0196611110.3847/1538-4357/ad2dfbNeutrino-driven Outflows and the Elemental Abundance Patterns of Very Metal-poor StarsA. Psaltis0https://orcid.org/0000-0003-2197-0797M. Jacobi1https://orcid.org/0000-0001-8168-4579F. Montes2https://orcid.org/0000-0001-9849-5555A. Arcones3https://orcid.org/0000-0002-6995-3032C. J. Hansen4https://orcid.org/0000-0002-7277-7922H. Schatz5https://orcid.org/0000-0003-1674-4859Department of Physics, North Carolina State University , Raleigh, NC 27695, USA ; psaltis.tha@duke.edu; Triangle Universities Nuclear Laboratory, Duke University , Durham, NC 27710, USAInstitut für Kernphysik, Technische Universität Darmstadt , Schlossgartenstr. 2, Darmstadt 64289, Germany ; almudena.arcones@physik.tu-darmstadt.deFacility for Rare Isotope Beams , East Lansing, MI 48824, USA; Joint Institute for Nuclear Astrophysics - CEE, Michigan State University , East Lansing, MI 48824, USAInstitut für Kernphysik, Technische Universität Darmstadt , Schlossgartenstr. 2, Darmstadt 64289, Germany ; almudena.arcones@physik.tu-darmstadt.de; GSI Helmholtzzentrum für Schwerionenforschung GmbH , Planckstr. 1, Darmstadt 64291, GermanyInstitute for Applied Physics, Goethe University Frankfurt , Max-von-Laue-Str. 12, Frankfurt am Main 60438, GermanyFacility for Rare Isotope Beams , East Lansing, MI 48824, USA; Joint Institute for Nuclear Astrophysics - CEE, Michigan State University , East Lansing, MI 48824, USA; Department of Physics and Astronomy, Michigan State University , 567 Wilson Road, East Lansing, MI 48824, USAThe elemental abundances between strontium and silver ( Z = 38–47) observed in the atmospheres of very metal-poor stars in the Galaxy may contain the fingerprint of the weak r -process and ν p -process occurring in early core-collapse supernovae explosions. In this work, we combine various astrophysical conditions based on a steady-state model to cover the richness of the supernova ejecta in terms of entropy, expansion timescale, and electron fraction. The calculated abundances based on different combinations of conditions are compared with stellar observations, with the aim of constraining supernova ejecta conditions. We find that some conditions of the neutrino-driven outflows consistently reproduce the observed abundances of our sample. In addition, from the successful combinations, the neutron-rich trajectories better reproduce the observed abundances of Sr–Zr ( Z = 38–40), while the proton-rich ones, Mo–Pd ( Z = 42–47).https://doi.org/10.3847/1538-4357/ad2dfbCore-collapse supernovaeIsotopic abundancesNuclear astrophysicsNucleosynthesisObservational astronomyR-process |
| spellingShingle | A. Psaltis M. Jacobi F. Montes A. Arcones C. J. Hansen H. Schatz Neutrino-driven Outflows and the Elemental Abundance Patterns of Very Metal-poor Stars The Astrophysical Journal Core-collapse supernovae Isotopic abundances Nuclear astrophysics Nucleosynthesis Observational astronomy R-process |
| title | Neutrino-driven Outflows and the Elemental Abundance Patterns of Very Metal-poor Stars |
| title_full | Neutrino-driven Outflows and the Elemental Abundance Patterns of Very Metal-poor Stars |
| title_fullStr | Neutrino-driven Outflows and the Elemental Abundance Patterns of Very Metal-poor Stars |
| title_full_unstemmed | Neutrino-driven Outflows and the Elemental Abundance Patterns of Very Metal-poor Stars |
| title_short | Neutrino-driven Outflows and the Elemental Abundance Patterns of Very Metal-poor Stars |
| title_sort | neutrino driven outflows and the elemental abundance patterns of very metal poor stars |
| topic | Core-collapse supernovae Isotopic abundances Nuclear astrophysics Nucleosynthesis Observational astronomy R-process |
| url | https://doi.org/10.3847/1538-4357/ad2dfb |
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