New Neutron-capture Site in Massive Pop III and Pop II Stars as a Source for Heavy Elements in the Early Galaxy

Banerjee, Projjwal; Qian, Yong-Zhong; Heger, Alexander

doi:10.3847/1538-4357/aadb8c

Title: New Neutron-capture Site in Massive Pop III and Pop II Stars as a Source for Heavy Elements in the Early Galaxy

Journal Article · 27 September 2018 · The Astrophysical Journal (Online)

DOI: https://doi.org/10.3847/1538-4357/aadb8c · OSTI ID:1610091

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Shanghai Jiao Tong Univ. (China); DOE/OSTI
Univ. of Minnesota, Minneapolis, MN (United States); Tsung-Dao Lee Inst., Shanghai (China)
Tsung-Dao Lee Inst., Shanghai (China); Monash Univ., Melbourne, VIC (Australia)

We propose a new neutron-capture site in early metal-poor and metal-free stars of ~20–30 M_⊙ that results from proton ingestion in the He shell during late stages of the stars' lives. Most of the neutron capture occurs in the first lesssim106 s following proton ingestion when ¹³C(α, n)¹⁶O produces neutron densities typical of the intermediate neutron-capture process. This phase may be followed by another lasting gsim10⁷ s with ¹⁷O(α, n)²⁰Ne producing much lower neutron densities typical of the slow neutron-capture process. We explore the dependence of the proposed neutron-capture nucleosynthesis on the amount and time of proton ingestion, the initial metallicity, and the ensuing supernova shock. We obtain a range of heavy-element abundance patterns, including those attributed to the slow neutron-capture process or a combination of the slow and rapid neutron-capture processes. Our results can account for the observed ubiquity of heavy elements such as Sr and Ba in the early Galaxy and explain puzzling abundance patterns of these elements in at least some very metal-poor (VMP) stars, including those of the carbon-enhanced varieties. In the latter case, the explanation by the single site proposed here differs from the existing paradigm that attributes various classes of VMP stars to enrichment by multiple different sites.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-87ER40328

OSTI ID:: 1610091

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 865; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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The i-process yields of rapidly accreting white dwarfs from multicycle He-shell flash stellar evolution models with mixing parametrizations from 3D hydrodynamics simulations Denissenkov, Pavel A.; Herwig, Falk; Woodward, Paul Monthly Notices of the Royal Astronomical Society, Vol. 488, Issue 3 https://doi.org/10.1093/mnras/stz1921	journal	July 2019
The impact of (n,γ) reaction rate uncertainties on the predicted abundances of i-process elements with 32 ≤ Z ≤ 48 in the metal-poor star HD94028 McKay, John E.; Denissenkov, Pavel A.; Herwig, Falk Monthly Notices of the Royal Astronomical Society, Vol. 491, Issue 4 https://doi.org/10.1093/mnras/stz3322	journal	December 2019
Chemical Abundances in the Ultra-faint Dwarf Galaxies Grus I and Triangulum II: Neutron-capture Elements as a Defining Feature of the Faintest Dwarfs Ji, Alexander P.; Simon, Joshua D.; Frebel, Anna The Astrophysical Journal, Vol. 870, Issue 2 https://doi.org/10.3847/1538-4357/aaf3bb	journal	January 2019
Neutron Star Mergers Might Not Be the Only Source of r -process Elements in the Milky Way Côté, Benoit; Eichler, Marius; Arcones, Almudena The Astrophysical Journal, Vol. 875, Issue 2 https://doi.org/10.3847/1538-4357/ab10db	journal	April 2019
The Lanthanide Fraction Distribution in Metal-poor Stars: A Test of Neutron Star Mergers as the Dominant r -process Site Ji, Alexander P.; Drout, Maria R.; Hansen, Terese T. The Astrophysical Journal, Vol. 882, Issue 1 https://doi.org/10.3847/1538-4357/ab3291	journal	August 2019
Learning about the Intermediate Neutron-capture Process from Lead Abundances Hampel, Melanie; Karakas, Amanda I.; Stancliffe, Richard J. The Astrophysical Journal, Vol. 887, Issue 1 https://doi.org/10.3847/1538-4357/ab4fe8	journal	December 2019
New s -process Mechanism in Rapidly Rotating Massive Population II Stars Banerjee, Projjwal; Heger, Alexander; Qian, Yong-Zhong The Astrophysical Journal, Vol. 887, Issue 2 https://doi.org/10.3847/1538-4357/ab517a	journal	December 2019
Chemical Abundances in the Ultra-Faint Dwarf Galaxies Grus I and Triangulum II: Neutron-Capture Elements as a Defining Feature of the Faintest Dwarfs Ji, Alexander P.; Simon, Joshua D.; Frebel, Anna arXiv https://doi.org/10.48550/arxiv.1809.02182	text	January 2018
The i-process yields of rapidly-accreting white dwarfs from multicycle He-shell flash stellar evolution models with mixing parameterizations from 3D hydrodynamics simulations Denissenkov, Pavel; Herwig, Falk; Woodward, Paul arXiv https://doi.org/10.48550/arxiv.1809.03666	text	January 2018
The lanthanide fraction distribution in metal-poor stars: a test of neutron star mergers as the dominant r-process site Ji, Alexander P.; Drout, Maria R.; Hansen, Terese T. arXiv https://doi.org/10.48550/arxiv.1905.01814	text	January 2019

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