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Title: Production of the entire range of r-process nuclides by black hole accretion disc outflows from neutron star mergers

Abstract

We consider r-process nucleosynthesis in outflows from black hole accretion discs formed in double neutron star and neutron star–black hole mergers. These outflows, powered by angular momentum transport processes and nuclear recombination, represent an important – and in some cases dominant – contribution to the total mass ejected by the merger. Here we calculate the nucleosynthesis yields from disc outflows using thermodynamic trajectories from hydrodynamic simulations, coupled to a nuclear reaction network. We find that outflows produce a robust abundance pattern around the second r-process peak (mass number A ~ 130), independent of model parameters, with significant production of A < 130 nuclei. This implies that dynamical ejecta with high electron fraction may not be required to explain the observed abundances of r-process elements in metal poor stars. Disc outflows reach the third peak (A ~ 195) in most of our simulations, although the amounts produced depend sensitively on the disc viscosity, initial mass or entropy of the torus, and nuclear physics inputs. Some of our models produce an abundance spike at A = 132 that is absent in the Solar system r-process distribution. The spike arises from convection in the disc and depends on the treatment of nuclear heatingmore » in the simulations. We conclude that disc outflows provide an important – and perhaps dominant – contribution to the r-process yields of compact binary mergers, and hence must be included when assessing the contribution of these systems to the inventory of r-process elements in the Galaxy.« less

Authors:
 [1];  [2];  [3];  [4]
  1. Technical Univ. of Darmstadt (Germany)
  2. Univ. of California, Berkeley, CA (United States)
  3. Technical Univ. of Darmstadt (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  4. Columbia Univ., New York, NY (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE
OSTI Identifier:
1526235
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 463; Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Wu, Meng-Ru, Fernández, Rodrigo, Martínez-Pinedo, Gabriel, and Metzger, Brian D. Production of the entire range of r-process nuclides by black hole accretion disc outflows from neutron star mergers. United States: N. p., 2016. Web. doi:10.1093/mnras/stw2156.
Wu, Meng-Ru, Fernández, Rodrigo, Martínez-Pinedo, Gabriel, & Metzger, Brian D. Production of the entire range of r-process nuclides by black hole accretion disc outflows from neutron star mergers. United States. https://doi.org/10.1093/mnras/stw2156
Wu, Meng-Ru, Fernández, Rodrigo, Martínez-Pinedo, Gabriel, and Metzger, Brian D. Thu . "Production of the entire range of r-process nuclides by black hole accretion disc outflows from neutron star mergers". United States. https://doi.org/10.1093/mnras/stw2156. https://www.osti.gov/servlets/purl/1526235.
@article{osti_1526235,
title = {Production of the entire range of r-process nuclides by black hole accretion disc outflows from neutron star mergers},
author = {Wu, Meng-Ru and Fernández, Rodrigo and Martínez-Pinedo, Gabriel and Metzger, Brian D.},
abstractNote = {We consider r-process nucleosynthesis in outflows from black hole accretion discs formed in double neutron star and neutron star–black hole mergers. These outflows, powered by angular momentum transport processes and nuclear recombination, represent an important – and in some cases dominant – contribution to the total mass ejected by the merger. Here we calculate the nucleosynthesis yields from disc outflows using thermodynamic trajectories from hydrodynamic simulations, coupled to a nuclear reaction network. We find that outflows produce a robust abundance pattern around the second r-process peak (mass number A ~ 130), independent of model parameters, with significant production of A < 130 nuclei. This implies that dynamical ejecta with high electron fraction may not be required to explain the observed abundances of r-process elements in metal poor stars. Disc outflows reach the third peak (A ~ 195) in most of our simulations, although the amounts produced depend sensitively on the disc viscosity, initial mass or entropy of the torus, and nuclear physics inputs. Some of our models produce an abundance spike at A = 132 that is absent in the Solar system r-process distribution. The spike arises from convection in the disc and depends on the treatment of nuclear heating in the simulations. We conclude that disc outflows provide an important – and perhaps dominant – contribution to the r-process yields of compact binary mergers, and hence must be included when assessing the contribution of these systems to the inventory of r-process elements in the Galaxy.},
doi = {10.1093/mnras/stw2156},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 463,
place = {United States},
year = {Thu Aug 25 00:00:00 EDT 2016},
month = {Thu Aug 25 00:00:00 EDT 2016}
}

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journal, September 2018

  • Ojima, Takuya; Ishimaru, Yuhri; Wanajo, Shinya
  • The Astrophysical Journal, Vol. 865, Issue 2
  • DOI: 10.3847/1538-4357/aada11

Super-knee Cosmic Rays from Galactic Neutron Star Merger Remnants
journal, October 2018

  • Kimura, Shigeo S.; Murase, Kohta; Mészáros, Peter
  • The Astrophysical Journal, Vol. 866, Issue 1
  • DOI: 10.3847/1538-4357/aadc0a

Physical Conditions for the r -process. I. Radioactive Energy Sources of Kilonovae
journal, November 2018


Binary Neutron Star Mergers: Mass Ejection, Electromagnetic Counterparts, and Nucleosynthesis
journal, December 2018

  • Radice, David; Perego, Albino; Hotokezaka, Kenta
  • The Astrophysical Journal, Vol. 869, Issue 2
  • DOI: 10.3847/1538-4357/aaf054

Black Hole Hyperaccretion Inflow–Outflow Model. II. Long-duration Gamma-Ray Bursts and Supernova 56 Ni Bumps
journal, January 2019


Neutron Star Mergers Might Not Be the Only Source of r -process Elements in the Milky Way
journal, April 2019

  • Côté, Benoit; Eichler, Marius; Arcones, Almudena
  • The Astrophysical Journal, Vol. 875, Issue 2
  • DOI: 10.3847/1538-4357/ab10db

Probing the Production of Actinides under Different r-process Conditions
journal, July 2019


Active–Sterile Neutrino Oscillations in Neutrino-driven Winds: Implications for Nucleosynthesis
journal, July 2019

  • Xiong, Zewei; Wu, Meng-Ru; Qian, Yong-Zhong
  • The Astrophysical Journal, Vol. 880, Issue 2
  • DOI: 10.3847/1538-4357/ab2870

The Lanthanide Fraction Distribution in Metal-poor Stars: A Test of Neutron Star Mergers as the Dominant r -process Site
journal, August 2019

  • Ji, Alexander P.; Drout, Maria R.; Hansen, Terese T.
  • The Astrophysical Journal, Vol. 882, Issue 1
  • DOI: 10.3847/1538-4357/ab3291

Enrichment of Strontium in Dwarf Galaxies
journal, October 2019

  • Hirai, Yutaka; Wanajo, Shinya; Saitoh, Takayuki R.
  • The Astrophysical Journal, Vol. 885, Issue 1
  • DOI: 10.3847/1538-4357/ab4654

Diversity of Kilonova Light Curves
journal, February 2020

  • Kawaguchi, Kyohei; Shibata, Masaru; Tanaka, Masaomi
  • The Astrophysical Journal, Vol. 889, Issue 2
  • DOI: 10.3847/1538-4357/ab61f6

The Intermediate r-process in Core-collapse Supernovae Driven by the Magneto-rotational Instability
journal, February 2017

  • Nishimura (西村信, N.; Sawai (澤井秀, H.; Takiwaki (滝脇知, T.
  • The Astrophysical Journal, Vol. 836, Issue 2
  • DOI: 10.3847/2041-8213/aa5dee

AT 2017gfo: An Anisotropic and Three-component Kilonova Counterpart of GW170817
journal, November 2017

  • Perego, Albino; Radice, David; Bernuzzi, Sebastiano
  • The Astrophysical Journal, Vol. 850, Issue 2
  • DOI: 10.3847/2041-8213/aa9ab9

GW170817: Joint Constraint on the Neutron Star Equation of State from Multimessenger Observations
journal, January 2018

  • Radice, David; Perego, Albino; Zappa, Francesco
  • The Astrophysical Journal, Vol. 852, Issue 2
  • DOI: 10.3847/2041-8213/aaa402

Viscous-dynamical Ejecta from Binary Neutron Star Mergers
journal, December 2018

  • Radice, David; Perego, Albino; Hotokezaka, Kenta
  • The Astrophysical Journal, Vol. 869, Issue 2
  • DOI: 10.3847/2041-8213/aaf053

Constraining Collapsar r -process Models through Stellar Abundances
journal, May 2019


Spiral-wave Wind for the Blue Kilonova
journal, November 2019

  • Nedora, Vsevolod; Bernuzzi, Sebastiano; Radice, David
  • The Astrophysical Journal, Vol. 886, Issue 2
  • DOI: 10.3847/2041-8213/ab5794

A kilonova as the electromagnetic counterpart to a gravitational-wave source
journal, October 2017

  • Smartt, S. J.; Chen, T. -W.; Jerkstrand, A.
  • Nature, Vol. 551, Issue 7678
  • DOI: 10.1038/nature24303

The Intermediate r-process in Core-collapse Supernovae Driven by the Magneto-rotational Instability
text, January 2017


Impact of ejecta morphology and composition on the electromagnetic signatures of neutron star mergers
text, January 2017


A kilonova as the electromagnetic counterpart to a gravitational-wave source
text, January 2017


AT2017gfo: an anisotropic and three-component kilonova counterpart of GW170817
text, January 2017


A magnetar origin for the kilonova ejecta in GW170817
text, January 2018


Optimizing searches for electromagnetic counterparts of gravitational wave triggers
text, January 2018


Super-Knee Cosmic Rays from Galactic Neutron Star Merger Remnants
text, January 2018


Stochastic Chemical Evolution of Galactic Subhalos and the Origin of r-Process Elements
text, January 2018


Binary Neutron Star Mergers: Mass Ejection, Electromagnetic Counterparts and Nucleosynthesis
text, January 2018


Viscous-Dynamical Ejecta from Binary Neutron Star Merger
text, January 2018


Multimessenger Parameter Estimation of GW170817
text, January 2018


A new delay time distribution for merging neutron stars tested against Galactic and cosmic data
text, January 2019


Equation-of-state Constraints and the QCD Phase Transition in the Era of Gravitational-Wave Astronomy
text, January 2019


Full Transport Model of GW170817-Like Disk Produces a Blue Kilonova
text, January 2019


Diversity of kilonova light curves
text, January 2019


Kilonovae
journal, December 2019