Evolution of neutron capture elements in dwarf galaxies

Abstract

We study the evolution of Eu and Ba abundances in local group dwarf spheroidal and ultra faint dwarf galaxies by means of detailed chemical evolution models and compare our results with new sets of homogeneous abundances. The adopted models include gas infall and outflow and have been previously tested. We investigate several production scenarios for r-process elements: merging neutron stars and magneto-rotational driven supernovae. Production of Ba through the main s-process acting in low- and intermediate- mass stars is considered as well. We also test different sets of nucleosynthesis yields. For merging neutron stars we adopt either a constant and short delay time for merging or a delay time distribution function. Our simulations show that: i) if r-process elements are produced only by a quick source, it is possible to reproduce the [Eu/Fe] vs [Fe/H], but those models fail in reproducing the [Ba/Fe] vs [Fe/H]. ii) If r-process elements are produced only with longer delays the opposite happens. iii) If both a quick source and a delayed one are adopted, such as magneto-rotational driven supernovae and merging neutron stars with a delay time distribution, the [Eu/Fe] abundance pattern is successfully reproduced, but models still fail in reproducing the [Ba/Fe]. iv) On the other hand, the characteristic abundances of Reticulum II can be reproduced only if both the Eu and the r-process fraction of Ba are produced on short and constant time delays during a single merging event. We discuss also other possible interpretations, including an inhomogeneous mixing of gas which might characterize this galaxy.

References in corpus (74)

• The chemical composition of the Sun
• The Global Schmidt Law in Star Forming Galaxies
• Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
• Star Formation Histories, Abundances and Kinematics of Dwarf Galaxies in the Local Group
• The Progenitor Stars of Gamma-Ray Bursts
• Galactic chemical evolution: Carbon through Zinc
• Rotating Massive Main-Sequence Stars I: Grids of Evolutionary Models and Isochrones
• Updated stellar yields from Asymptotic Giant Branch models
• Origin of the Heaviest Elements: the Rapid Neutron-Capture Process
• A Universal Mass Profile for Dwarf Spheroidal Galaxies?
• Presupernova evolution and explosive nucleosynthesis of rotating massive stars in the metallicity range -3 <=[Fe/H]<= 0
• Eight New Milky Way Companions Discovered in First-Year Dark Energy Survey Data
• The Faintest Dwarf Galaxies
• Numerical Methods of Star Formation History Measurement and Applications to Seven Dwarf Spheroidals
• Magnetorotationally driven Supernovae as the origin of early galaxy $r$-process elements?
• Identification of strontium in the merger of two neutron stars
• The Stellar Abundances for Galactic Archeology (SAGA) Database - Compilation of the Characteristics of Known Extremely Metal-Poor Stars
• Nucleosynthesis and mixing on the Asymptotic Giant Branch. III. Predicted and observed s-process abundances
• Quantifying the uncertainties of chemical evolution studies. II. Stellar yields
• R-process enrichment from a single event in an ancient dwarf galaxy
• Collapsars as a major source of r-process elements
• The Rise of the s-Process in the Galaxy
• Neutron star mergers versus core-collapse supernovae as dominant r-process sites in the early Galaxy
• First Stars VIII -- Enrichment of the neutron-capture elements in the early Galaxy
• The Quenching of the Ultra-Faint Dwarf Galaxies in the Reionization Era
• The r-process nucleosynthesis in the various jet-like explosions of magnetorotational core-collapse supernovae
• The kinematic status and mass content of the Sculptor dwarf spheroidal galaxy
• On the typical timescale for the chemical enrichment from SNeIa in Galaxies
• Evolution, Explosion and Nucleosynthesis of Core Collapse Supernovae
• Neutron Star Mergers Might not be the Only Source of r-Process Elements in the Milky Way
• $s$-process production in rotating massive stars at solar and low metallicities
• Nucleosynthesis-relevant conditions in neutrino-driven supernova outflows. I. Spherically symmetric hydrodynamic simulations
• The intermediate r-process in core-collapse supernovae driven by the magneto-rotational instability
• Europium production: neutron star mergers versus core-collapse supernovae
• The Star Formation & Chemical Evolution History of the Fornax Dwarf Spheroidal Galaxy
• The Star Formation & Chemical Evolution History of the Sculptor Dwarf Spheroidal Galaxy
• R-process Nucleosynthesis from Three-Dimensional Magnetorotational Core-Collapse Supernovae
• Neutrino-driven wind simulations and nucleosynthesis of heavy elements
• r-Process Nucleosynthesis: Connecting Rare-Isotope Beam Facilities with the Cosmos
• The Predicted Metallicity Distribution of Stars in Dwarf Spheroidal Galaxies
• Non-parametric star formation histories for 5 dwarf spheroidal galaxies of the local group
• The role of neutron star mergers in the chemical evolution of the Galactic halo
• The s-process in the Galactic halo: the fifth signature of spinstars in the early Universe?
• On the Progenitor of Binary Neutron Star Merger GW170817
• The chemical evolution of Barium and Europium in the Milky Way
• Explaining the Ba, Y, Sr, and Eu abundance scatter in metal-poor halo stars: constraints to the r-process
• $r$-Process Nucleosynthesis from Three-dimensional Jet-driven Core-Collapse Supernovae with Magnetic Misalignments
• A Deep Survey of the Fornax dSph I: Star Formation History
• A new delay time distribution for merging neutron stars tested against Galactic and cosmic data
• Nucleosynthesis in magneto-rotational supernovae
• 129I and 247Cm in Meteorites Constrain the Last Astrophysical Source of Solar r-process Elements
• Simulating Neutron Star Mergers as r-process Sources in Ultra Faint Dwarf Galaxies
• Chemical evolution of Local Group dwarf galaxies in a cosmological context -- I. A new modelling approach and its application to the Sculptor dwarf spheroidal galaxy
• The effects of different Type Ia SN yields on Milky Way chemical evolution
• r-process enrichment of ultra-faint dwarf galaxies by fast merging double neutron stars
• Evidence for $\gtrsim 4$ Gyr timescales of neutron star mergers from Galactic archaeology
• Chemical evolution of classical and ultra-faint dwarf spheroidal galaxies
• Retainment of r-process material in dwarf galaxies
• The formation of the heaviest elements
• Neutron star binary orbits in their host potential: effect on early r-process enrichment
• Constraints on stellar rotation from the evolution of Sr and Ba in the Galactic halo
• R-process enrichment in ultrafaint dwarf galaxies
• The IGIMF and other IMFs in dSphs: the case of Sagittarius
• Neutron-capture elements in dwarf galaxies II: Challenges for the s- and i-processes at low metallicity
• Simulating Metal Mixing of Both Common and Rare Enrichment Sources in a Low Mass Dwarf Galaxy
• Nucleosynthesis in Neutrino-Driven Supernovae
• The r-Process in the Proto-Neutron-Star Winds with Anisotropic Neutrino Emission
• The contribution from rotating massive stars to the enrichment in Sr and Ba of the Milky Way
• Predicted rates of merging neutron stars in galaxies
• On the delay times of merging double neutron stars
• Neutron-capture elements in dwarf galaxies III: A homogenized analysis of 13 dwarf spheroidal and ultra-faint galaxies
• Complexity in small-scale dwarf spheroidal galaxies
• Review of Multi-messenger observations of neutron rich matter
• Chemical tagging and the second r-process

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• Origin of neutron capture elements with the Gaia-ESO survey: the evolution of s- and r-process elements across the Milky Way
• The chemical composition of globular clusters in the Local Group
• Signatures of R-process Enrichment in Supernovae from Collapsars
• Common envelope jets supernova r-process yields can reproduce $[Eu/Fe]$ abundance evolution in the Galaxy
• 2D chemical evolution models II. Effects of multiple spiral arm patterns on O, Eu, Fe and Ba abundance gradients
• Chemical Evolution of R-process Elements in Stars (CERES): IV. An observational run-up of the third r-process peak with Hf, Os, Ir, and Pt
• Effects of nuclear matter properties in neutron star mergers
• GalCEM I -- An Open-Source Detailed Isotopic Chemical Evolution Code
• Modelling chemical clocks -- Theoretical evidences of the space and time evolution of [s/alpha] in the Galactic disc with Gaia-ESO survey
• Hydrodynamic mixing of accretion disk outflows in collapsars: implications for r-process signatures
• Europium, we have a problem. Modelling r-process enrichment across Local Group galaxies
• Enrichment of the Galactic disc with neutron-capture elements: Gd, Dy, and Th
• Chemical evolution of elliptical galaxies I: supernovae and AGN feedback
• Where has all the $r$-process gone? Timescales for GRB-Kilonovae to Enrich their Host Galaxies
• The chemical DNA of the Magellanic Clouds VI. Origin and evolution of neutron-capture elements in the SMC