The Impact of Initial Composition on Massive Star Evolution and Nucleosynthesis
We study the sensitivity of presupernova evolution and supernova nucleosynthesis yields of massive stars to variations of the initial composition. We use the solar abundances from Lodders, and compute two different sets of initial stellar compositions: (i) scaled solar abundances and (ii) the isotop...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/add68f |
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| author | Christopher West Alexander Heger Benoit Côté Lev Serxner Haoxuan Sun |
| author_facet | Christopher West Alexander Heger Benoit Côté Lev Serxner Haoxuan Sun |
| author_sort | Christopher West |
| collection | DOAJ |
| description | We study the sensitivity of presupernova evolution and supernova nucleosynthesis yields of massive stars to variations of the initial composition. We use the solar abundances from Lodders, and compute two different sets of initial stellar compositions: (i) scaled solar abundances and (ii) the isotopic galactic chemical history model (GCH) developed by C. West & A. Heger. We run a grid of models using the KEPLER stellar evolution code, with 7 initial stellar masses, 12 initial metallicities, and the 2 scaling methods, to explore the effects on nucleosynthesis over a metallicity range of −4.0 ≤ [ Z ] ≤ +0.3. We find that the compositions from the GCH model better reproduce the weak s -process peak than the scaled solar models. The model yields are then used in the OMEGA Galactic Chemical Evolution (GCE) code to assess this result further. We find that initial abundances used in computing stellar structure have a larger impact on the GCE results than the initial abundances used in the large nuclear co-processing network, with the GCH model again being favored when compared to observations. Finally, a machine learning algorithm was used to verify the free parameter values of the GCH model, which were previously found by C. West & A. Heger using a stochastic fitting process. The updated model is provided as an accessible tool for further nucleosynthesis studies. |
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| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-b4b8a2e6331344e89e7354b0cb9d0b092025-06-26T12:33:52ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198715110.3847/1538-4357/add68fThe Impact of Initial Composition on Massive Star Evolution and NucleosynthesisChristopher West0Alexander Heger1https://orcid.org/0000-0002-3684-1325Benoit Côté2https://orcid.org/0000-0002-9986-8816Lev Serxner3Haoxuan Sun4Department of Physics and Astronomy, Carleton College , Northfield, MN 55057, USA ; cwest@carleton.edu, christopher.west287@gmail.com; Department of Physics and Astronomy, Macalester College , Saint Paul, MN 55105, USA ; lssgm1@gmail.com, haoxuansun0616@gmail.com; School of Physics and Astronomy, University of Minnesota , Minneapolis, MN 55455, USA; Minnesota Institute for Astrophysics , USA; Joint Institute for Nuclear Astrophysics , Notre Dame, IN 46556, USASchool of Physics and Astronomy, Monash University , Vic 3800, Australia ; alexander.heger@monash.edu; Joint Institute for Nuclear Astrophysics, Michigan State University , MI, USAJoint Institute for Nuclear Astrophysics, Michigan State University , MI, USA; Konkoly Observatory, Research Centre for Astronomy and Earth Sciences , HUN-REN, Konkoly Thege M. út 15-17, Budapest 1121, Hungary; Department of Physics and Astronomy, University of Victoria , Victoria, CanadaDepartment of Physics and Astronomy, Macalester College , Saint Paul, MN 55105, USA ; lssgm1@gmail.com, haoxuansun0616@gmail.comDepartment of Physics and Astronomy, Macalester College , Saint Paul, MN 55105, USA ; lssgm1@gmail.com, haoxuansun0616@gmail.comWe study the sensitivity of presupernova evolution and supernova nucleosynthesis yields of massive stars to variations of the initial composition. We use the solar abundances from Lodders, and compute two different sets of initial stellar compositions: (i) scaled solar abundances and (ii) the isotopic galactic chemical history model (GCH) developed by C. West & A. Heger. We run a grid of models using the KEPLER stellar evolution code, with 7 initial stellar masses, 12 initial metallicities, and the 2 scaling methods, to explore the effects on nucleosynthesis over a metallicity range of −4.0 ≤ [ Z ] ≤ +0.3. We find that the compositions from the GCH model better reproduce the weak s -process peak than the scaled solar models. The model yields are then used in the OMEGA Galactic Chemical Evolution (GCE) code to assess this result further. We find that initial abundances used in computing stellar structure have a larger impact on the GCE results than the initial abundances used in the large nuclear co-processing network, with the GCH model again being favored when compared to observations. Finally, a machine learning algorithm was used to verify the free parameter values of the GCH model, which were previously found by C. West & A. Heger using a stochastic fitting process. The updated model is provided as an accessible tool for further nucleosynthesis studies.https://doi.org/10.3847/1538-4357/add68fNucleosynthesisStellar nucleosynthesisStellar abundancesIsotopic abundancesGalaxy abundancesGalaxy chemical evolution |
| spellingShingle | Christopher West Alexander Heger Benoit Côté Lev Serxner Haoxuan Sun The Impact of Initial Composition on Massive Star Evolution and Nucleosynthesis The Astrophysical Journal Nucleosynthesis Stellar nucleosynthesis Stellar abundances Isotopic abundances Galaxy abundances Galaxy chemical evolution |
| title | The Impact of Initial Composition on Massive Star Evolution and Nucleosynthesis |
| title_full | The Impact of Initial Composition on Massive Star Evolution and Nucleosynthesis |
| title_fullStr | The Impact of Initial Composition on Massive Star Evolution and Nucleosynthesis |
| title_full_unstemmed | The Impact of Initial Composition on Massive Star Evolution and Nucleosynthesis |
| title_short | The Impact of Initial Composition on Massive Star Evolution and Nucleosynthesis |
| title_sort | impact of initial composition on massive star evolution and nucleosynthesis |
| topic | Nucleosynthesis Stellar nucleosynthesis Stellar abundances Isotopic abundances Galaxy abundances Galaxy chemical evolution |
| url | https://doi.org/10.3847/1538-4357/add68f |
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