Neutrino-driven Outflows and the Elemental Abundance Patterns of Very Metal-poor Stars

Psaltis, A.; Jacobi, M.; Montes, F.; Arcones, A.; Hansen, C. J.; Schatz, H.

doi:10.3847/1538-4357/ad2dfb

Title: Neutrino-driven Outflows and the Elemental Abundance Patterns of Very Metal-poor Stars

Journal Article · 21 April 2024 · The Astrophysical Journal

DOI: https://doi.org/10.3847/1538-4357/ad2dfb · OSTI ID:2339915

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Abstract 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).

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0017799; FG02-97ER41042

OSTI ID:: 2339915

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 966; ISSN 0004-637X

Publisher:: American Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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