Metallicity-Suppressed Collapsars Cannot be the Dominant r-Process Source in the Milky Way

Abstract

We develop a high-performance analytical model of Galactic Chemical Evolution, which accounts for delay time distributions and lock-up of stellar yields in a thermal-phased ISM. The model is capable of searching, for the first time, through the high-dimensional parameter space associated with the r-process enrichment of the Milky Way by its possible sources: Neutron Star Mergers and Collapsar events. Their differing formation mechanisms give these two processes different time dependencies, a property which has frequently been used to argue in favour of collapsars as the dominant r-process source. However, we show that even with large degrees of freedom in the allowed thermal, structural, and chemical properties of the galaxy, large regions of parameter space are in strong tension with the data. In particular, whilst we are able to find models in which neutron star mergers produce the majority of r-process material, the data rule out all models with dominant collapsar yields. With no other identified source, we conclude that Neutron Star Mergers must be the dominant contributors to the modern Milky Way r-process budget.

arXiv comment20 pages (3 pages appendices), 16 figures

References in corpus (65)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Galactic Stellar and Substellar Initial Mass Function
• Collapsars - Gamma-Ray Bursts and Explosions in "Failed Supernovae"
• A large stellar evolution database for population synthesis studies. I. Scaled solar models and isochrones
• Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
• Exploring the Milky Way stellar disk. A detailed elemental abundance study of 714 F and G dwarf stars in the Solar neighbourhood
• Presupernova Evolution of Rotating Massive Stars I: Numerical Method and Evolution of the Internal Stellar Structure
• The Progenitor Stars of Gamma-Ray Bursts
• Elemental Abundance Survey of The Galactic Thick Disk
• New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
• Chemical evolution with radial mixing
• The Observed Offset Distribution of Gamma-Ray Bursts from Their Host Galaxies: A Robust Clue to the Nature of the Progenitors
• Evolution of rapidly rotating metal-poor massive stars towards gamma-ray bursts
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. IV. Detection of Near-infrared Signatures of r-process Nucleosynthesis with Gemini-South
• Abundances and Kinematics of Field Halo and Disk Stars I: Observational Data and Abundance Analysis
• No supernovae associated with two long-duration gamma ray bursts
• The Stellar Abundances for Galactic Archeology (SAGA) Database - Compilation of the Characteristics of Known Extremely Metal-Poor Stars
• Chemical yields from low- and intermediate-mass stars: model predictions and basic observational constraints
• Collapsars as a major source of r-process elements
• Explosive yields of massive stars from Z=0 to Z=Zsun
• Origin and structure of the Galactic disc(s)
• Neutron star mergers versus core-collapse supernovae as dominant r-process sites in the early Galaxy
• Toward a Unification of Star Formation Rate Determinations in the Milky Way and Other Galaxies
• The search for failed supernovae with the Large Binocular Telescope: confirmation of a disappearing star
• The present-day star formation rate of the Milky-Way determined from Spitzer detected young stellar objects
• Kinematics and history of the solar neighbourhood revisited
• Electron-capture supernovae as the origin of elements beyond iron
• Stars, Gas, and Dark Matter in the Solar Neighborhood
• Radial mixing and the transition between the thick and thin Galactic discs
• The Distribution of the Elements in the Galactic Disk III. A Reconsideration of Cepheids from l = 30 to 250 Degrees
• Neutron-capture elements in the very metal-poor star HD122563
• On the Collapsar Model of Long Gamma-Ray Bursts: Constraints from Cosmic Metallicity Evolution
• The r-Process in Neutrino-Driven Winds from Nascent, "Compact" Neutron Stars of Core-Collapse Supernovae
• The intermediate r-process in core-collapse supernovae driven by the magneto-rotational instability
• The Swift GRB Host Galaxy Legacy Survey - II. Rest-Frame NIR Luminosity Distribution and Evidence for a Near-Solar Metallicity Threshold
• Europium production: neutron star mergers versus core-collapse supernovae
• The first direct double neutron star merger detection: implications for cosmic nucleosynthesis
• The Type Ic Hypernova SN 2003dh/GRB 030329
• Systematic non-LTE study of the $-2.6\le$ [Fe/H] $\le 0.2$ F and G dwarfs in the solar neighbourhood. II. Abundance patterns from Li to Eu
• Supernova 2006aj and the associated X-Ray Flash 060218
• The origin and evolution of r- and s-process elements in the Milky Way stellar disk
• The R-Process Alliance: First Release from the Northern Search for r-Process Enhanced Metal-Poor Stars in the Galactic Halo
• Chemical Cartography with APOGEE: Multi-element abundance ratios
• r-Process Calculations and Galactic Chemical Evolution
• Equilibrium and Sudden Events in Chemical Evolution
• i-process nucleosynthesis and mass retention efficiency in He-shell flash evolution of rapidly accreting white dwarfs
• Neutrino spectra evolution during proto-neutron star deleptonization
• Abundances of neutron-capture elements in stars of the galactic disk substructures
• The metallicity dependence of the long-duration GRB rate from host galaxy luminosities
• Understanding inverse metallicity gradients in galactic discs as a consequence of inside-out formation
• Elemental abundances and classification of CEMP stars
• Metallicity effect in multi-dimensional SNIa nucleosynthesis
• Core-collapse Supernova Explosions Driven by the Hadron-quark Phase Transition as a Rare $r$-process Site
• Bimodality of [α/Fe]-[Fe/H] distributions is a natural outcome of dissipative collapse and disc growth in Milky Way-type galaxies
• Explosive Common-Envelope Ejection: Implications for Gamma-Ray Bursts and Low-Mass Black-Hole Binaries
• Galactic Simulations of r-process Elemental Abundances
• Magnetohydrodynamic Simulations of A Rotating Massive Star Collapsing to A Black Hole
• Radial Flows and Angular Momentum Conservation in Galactic Chemical Evolution
• Prospects for joint gravitational-wave and electromagnetic observations of neutron-star--black-hole coalescing binaries
• i-Process Contribution of Rapidly Accreting White Dwarfs to the Solar Composition of First-Peak Neutron-Capture Elements
• The chemical evolution of r-process elements from neutron star mergers: the role of a 2-phase interstellar medium
• Stochastic Chemical Evolution of Galactic Subhalos and the Origin of r-Process Elements
• Non-local thermodynamic equilibrium stellar spectroscopy with 1D and 3D models - II. Chemical properties of the Galactic metal-poor disc and the halo
• The AMBRE Project: r-process elements in the Milky Way thin and thick discs
• Galactic r-process abundance feature shaped by radial migration

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• Common envelope jets supernova r-process yields can reproduce $[Eu/Fe]$ abundance evolution in the Galaxy
• Signature of Collapsars as Sources for High-energy Neutrinos and $r$-process Nuclei
• Chemical Evolution in Nuclear Stellar Discs
• Revisiting the Perseus Cluster III: Role of Aspherical Explosions on its Chemical Composition and Extension to Metal-Poor Stars and Galaxies