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Title: Nuclear-dominated accretion flows in two dimensions – II. Ejecta dynamics and nucleosynthesis for CO and ONe white dwarfs

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [1]; ORCiD logo [2];  [3]
  1. Univ. of Alberta, Edmonton, AB (Canada)
  2. Univ. of California, Berkeley, CA (United States)
  3. Columbia Univ., New York, NY (United States)

We study mass ejection from accretion discs formed in the merger of a white dwarf with a neutron star or black hole. These discs are mostly radiatively inefficient and support nuclear fusion reactions, with ensuing outflows and electromagnetic transients. Here we perform time-dependent, axisymmetric hydrodynamic simulations of these discs including a physical equation of state, viscous angular momentum transport, a coupled 19-isotope nuclear network, and self-gravity. We find no detonations in any of the configurations studied. Our global models extend from the central object to radii much larger than the disc. We evolve these global models for several orbits, as well as alternate versions with an excised inner boundary to much longer times. We obtain robust outflows, with a broad velocity distribution in the range 102–104 km s-1. The outflow composition is mostly that of the initial white dwarf, with burning products mixed in at the |$${\lesssim } 10\rm {-}30{{\ \rm per\ cent}}$$| level by mass, including up to ~10-2 M of 56Ni. These heavier elements (plus 4He) are ejected within ≲ 40° of the rotation axis, and should have higher average velocities than the lighter elements that make up the white dwarf. These results are in broad agreement with previous one- and two-dimensional studies, and point to these systems as progenitors of rapidly rising (~ few day) transients. If accretion on to the central BH/NS powers a relativistic jet, these events could be accompanied by high-energy transients with peak luminosities ~1047–1050 erg s-1 and peak durations of up to several minutes, possibly accounting for events like CDF-S XT2.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1577633
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 488; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (67)

Mass transfer in white dwarf–neutron star binaries journal February 2017
Optical Thermonuclear Transients from Tidal Compression of White Dwarfs as Tracers of the low end of the Massive Black hole mass Function journal February 2016
Merging White Dwarf/Black Hole Binaries and Gamma-Ray Bursts text January 1998
Rapidly Evolving and Luminous Transients from Pan-Starrs1 journal September 2014
Electromagnetic Signatures of Neutron Star Mergers in the Advanced LIGO Era text January 2015
Electromagnetic Signatures of Neutron Star Mergers in the Advanced LIGO Era journal October 2016
Time dependent models of accretion disks with nuclear burning following the tidal disruption of a white dwarf by a neutron star text January 2016
Long-term GRMHD simulations of neutron star merger accretion discs: implications for electromagnetic counterparts journal October 2018
Neutron star–white dwarf mergers: early evolution, physical properties, and outcomes journal January 2019
A planetary system around the millisecond pulsar PSR1257 + 12 journal January 1992
The ultracompact nature of the black hole candidate X-ray binary 47 Tuc X9 journal February 2017
The ultracompact nature of the black hole candidate X-ray binary 47 Tuc X9 text January 2017
The structure and fate of white dwarf merger remnants text January 2013
Hot Accretion Flows Around Black Holes journal August 2014
Time-dependent models of accretion discs with nuclear burning following the tidal disruption of a white dwarf by a neutron star journal June 2016
Calcium-Rich gap Transients in the Remote Outskirts of Galaxies journal August 2012
Binary and Millisecond Pulsars journal September 1998
The demographics of neutron star – white dwarf mergers: Rates, delay-time distributions, and progenitors journal November 2018
The Piecewise Parabolic Method (PPM) for gas-dynamical simulations journal April 1984
A magnetar-powered X-ray transient as the aftermath of a binary neutron-star merger journal April 2019
Simulating self-gravitating hydrodynamic flows journal August 1995
The Probability Distribution Of Binary Pulsar Coalescence Rates. II. Neutron Star–White Dwarf Binaries journal December 2004
Pulsar Binary Birthrates with Spin-Opening Angle Correlations journal April 2010
Delayed outflows from black hole accretion tori following neutron star binary coalescence journal August 2013
Presupernova evolution of massive stars journal October 1978
Analytic Approximations to the Mass-Radius Relation and Energy of Zero-Temperature Stars journal July 1972
The dynamical stability of differentially rotating discs with constant specific angular momentum journal June 1984
Outflows from accretion discs formed in neutron star mergers: effect of black hole spin journal November 2014
Approximations to the radii of Roche lobes journal May 1983
Nuclear Dominated Accretion Flows in two Dimensions. i. Torus Evolution with Parametric Microphysics journal January 2013
Binary and Millisecond Pulsars journal November 2008
Nucleosynthesis in advective accretion disc and outflow: possible explanation for overabundances in winds from X-ray binaries journal April 2019
Hydrodynamical non-radiative accretion flows in two dimensions journal December 1999
Numerical Simulation of hot Accretion Flows. i. a Large Radial Dynamical Range and the Density Profile of Accretion flow journal December 2012
A faint type of supernova from a white dwarf with a helium-rich companion journal May 2010
The structure and fate of white dwarf merger remnants journal December 2013
Masses and Orbital Inclinations of Planets in the PSR B1257+12 System journal June 2003
Tidal Disruption and Ignition of White Dwarfs by Moderately Massive Black Holes journal March 2009
The merger of binary white dwarf-neutron stars: Simulations in full general relativity text January 2011
FLASH: An Adaptive Mesh Hydrodynamics Code for Modeling Astrophysical Thermonuclear Flashes journal November 2000
Merger of a white dwarf–neutron star binary to 10 29 carat diamonds: origin of the pulsar planets journal October 2016
The demographics of neutron star - white dwarf mergers: rates, delay-time distributions and progenitors text January 2018
Merger of binary white dwarf–neutron stars: Simulations in full general relativity journal November 2011
A magnetar-powered X-ray transient as the aftermath of a binary neutron-star merger text January 2019
Tidal disruption of a white dwarf by a black hole: the diversity of nucleosynthesis, explosion energy, and the fate of debris streams journal March 2018
Merging White Dwarf/Black Hole Binaries and Gamma‐Ray Bursts journal August 1999
The Probability Distribution of Binary Pulsar Coalescence Rate Estimates. II. Neutron Star-White Dwarf Binaries text January 2004
Tidal disruption and ignition of white dwarfs by moderately massive black holes text January 2008
Supernova Light Curves Powered by Fallback Accretion journal July 2013
Confirmation of Earth-Mass Planets Orbiting the Millisecond Pulsar PSR B1257 + 12 journal April 1994
Outflows from accretion disks formed in neutron star mergers: effect of black hole spin text January 2014
Neutrino Energy Loss in Stellar Interiors. VII. Pair, Photo-, Plasma, Bremsstrahlung, and Recombination Neutrino Processes journal January 1996
Tidal Disruption of a White Dwarf by a Black Hole: The Diversity of Nucleosynthesis, Explosion Energy, and the Fate of Debris Streams text January 2017
Matplotlib: A 2D Graphics Environment journal January 2007
Nuclear Dominated Accretion Flows in Two Dimensions. I. Torus Evolution with Parametric Microphysics text January 2012
A new type of long gamma-ray burst journal January 2007
Modified Newtonian Potentials for the Description of Relativistic Effects in Accretion Disks around Black Holes journal April 1996
The Accuracy, Consistency, and Speed of an Electron‐Positron Equation of State Based on Table Interpolation of the Helmholtz Free Energy journal February 2000
TYPE Iax SUPERNOVAE: A NEW CLASS OF STELLAR EXPLOSION text January 2013
On the theory of Type I supernovae journal May 1979
Merger of a White Dwarf-Neutron Star Binary to $10^{29}$ Carat Diamonds: Origin of the Pulsar Planets text January 2016
A fast-evolving luminous transient discovered by K2/Kepler journal March 2018
TYPE Iax SUPERNOVAE: A NEW CLASS OF STELLAR EXPLOSION journal March 2013
Nuclear-dominated accretion and subluminous supernovae from the merger of a white dwarf with a neutron star or black hole: Nuclear dominated accretion and WD-NS/BH mergers journal November 2011
Extensible component-based architecture for FLASH, a massively parallel, multiphysics simulation code journal October 2009
Integration of Nuclear Reaction Networks for Stellar Hydrodynamics journal September 1999
Type Iax Supernovae: A New Class of Stellar Explosion text January 2012

Cited By (5)

CDF-S XT1 and XT2: White Dwarf Tidal Disruption Events by Intermediate-Mass Black Holes? text January 2019
A unified binary neutron star merger magnetar model for the Chandra X-ray transients CDF-S XT1 and XT2 text January 2019
A Unified Binary Neutron Star Merger Magnetar Model for the Chandra X-Ray Transients CDF-S XT1 and XT2 journal November 2019
The Progenitors of Calcium-strong Transients journal December 2019
CDF-S XT1 and XT2: White Dwarf Tidal Disruption Events by Intermediate-mass Black Holes? journal October 2019