The structure and fate of white dwarf merger remnants

Abstract

We present a large parameter study where we investigate the structure of white dwarf (WD) merger remnants after the dynamical phase. A wide range of WD masses and compositions are explored and we also probe the effect of different initial conditions. We investigated the degree of mixing between the WDs, the conditions for detonations as well as the amount of gas ejected. We find that systems with lower mass ratios have more total angular momentum and as a result more mass is flung out in a tidal tail. Nuclear burning can affect the amount of mass ejected. Many WD binaries that contain a helium-rich WD achieve the conditions to trigger a detonation. In contrast, for carbon-oxygen transferring systems only the most massive mergers with a total mass above ~2.1 solar masses detonate. Even systems with lower mass may detonate long after the merger if the remnant remains above the Chandrasekhar mass and carbon is ignited at the centre. Finally, our findings are discussed in the context of several possible observed astrophysical events and stellar systems, such as hot subdwarfs, R Coronae Borealis stars, single massive white dwarfs, supernovae of type Ia and other transient events. A large database containing 225 white dwarf merger remnants is made available via a dedicated web page.

arXiv comment23 pages, 15 figures, submitted to MNRAS. A database containing 225 WD merger remnants is available for download at http://www.hs.uni-hamburg.de/DE/Ins/Per/Dan/wdwd_remnants.html

References in corpus (63)

• The Origin of Subdwarf B Star (I): the Formation Channels
• SPLASH: An interactive visualisation tool for Smoothed Particle Hydrodynamics simulations
• The origin of sdB stars (II)
• Explosions of O-Ne-Mg Cores, the Crab Supernova, and Subluminous Type II-P Supernovae
• The type Ia supernova SNLS-03D3bb from a super-Chandrasekhar-mass white dwarf star
• The Effects of Binary Evolution on the Dynamics of Core Collapse and Neutron-Star Kicks
• Low-frequency gravitational-wave science with eLISA/NGO
• Producing ultra-strong magnetic fields in neutron star mergers
• Double-detonation sub-Chandrasekhar supernovae: can minimum helium shell masses detonate the core?
• Faint Thermonuclear Supernovae from AM Canum Venaticorum Binaries
• Population synthesis for double white dwarfs I.Close detached systems
• Sub-luminous type Ia supernovae from the mergers of equal-mass white dwarfs with M~0.9 M_sun
• Detonations in Sub-Chandrasekhar Mass C+O White Dwarfs
• A faint type of supernova from a white dwarf with a helium-rich companion
• Sub-Chandrasekhar Mass Models For Type Ia Supernovae
• Mass Transfer between Double White Dwarfs
• Double-detonation sub-Chandrasekhar supernovae: synthetic observables for minimum helium shell mass models
• Remnant evolution after a carbon-oxygen white dwarf merger
• Tidal disruption and ignition of white dwarfs by moderately massive black holes
• Surface Detonations in Double Degenerate Binary Systems Triggered by Accretion Stream Instabilities
• Binary Star Origin of High Field Magnetic White Dwarfs
• Violent mergers of nearly equal-mass white dwarf as progenitors of subluminous Type Ia supernovae
• The multi-messenger picture of compact object encounters: binary mergers versus dynamical collisions
• Collisions of white dwarfs as a new progenitor channel for type Ia supernovae
• Prelude to a double degenerate merger: the onset of mass transfer and its impact on gravitational waves and surface detonations
• Thermonuclear .Ia Supernovae from Helium Shell Detonations: Explosion Models and Observables
• Sub-Chandrasekhar White Dwarf Mergers as the Progenitors of Type Ia Supernovae
• Fallback accretion in the aftermath of a compact binary merger
• Astrophysical Smooth Particle Hydrodynamics
• A 12 minute Orbital Period Detached White Dwarf Eclipsing Binary
• Rapidly Decaying Supernova 2010X: A Candidate ".Ia" Explosion
• Hot subdwarfs from the ESO Supernova Ia Progenitor Survey: II. Atmospheric parameters of subdwarf O stars
• The ELM Survey. II. Twelve Binary White Dwarf Merger Systems
• An Unusually Fast-Evolving Supernova
• Helium Shell Detonations on Low Mass White Dwarfs as a Possible Explanation for SN 2005E
• Off-Center Carbon Ignition in Rapidly Rotating, Accreting Carbon-Oxygen White Dwarfs
• The Fast and Furious Decay of the Peculiar Type Ic Supernova 2005ek
• High Resolution Calculations of Merging Neutron Stars I: Model Description and Hydrodynamic Evolution
• Accretion dynamics in neutron star black hole binaries
• Coalescing Binary Neutron Stars
• How the merger of two white dwarfs depends on their mass ratio: orbital stability and detonations at contact
• The Viscous Evolution of White Dwarf Merger Remnants
• The Post-Merger Magnetized Evolution of White Dwarf Binaries: The Double-Degenerate Channel of Sub-Chandrasekhar Type Ia Supernovae and the Formation of Magnetized White Dwarfs
• Discovery of the Eclipsing Detached Double White Dwarf Binary NLTT 11748
• Double white dwarf mergers and elemental surface abundances in extreme helium and R Coronae Borealis stars
• Spectra of Type Ia Supernovae from Double Degenerate Mergers
• Dynamical Tides in Compact White Dwarf Binaries: Tidal Synchronization and Dissipation
• Double white dwarfs and LISA
• Evolution of Close White Dwarf Binaries
• The Galactic Gravitational wave foreground
• On the formation of single and binary helium-rich sdO stars
• A Parameter-Space Study of Carbon-Oxygen White Dwarf Mergers
• A deeply eclipsing detached double helium white dwarf binary
• Constraints on the origin of the massive, hot, and rapidly rotating magnetic white dwarf RE J 0317-853 from an HST parallax measurement
• Discovery of a Bright, Extremely Low-Mass White Dwarf in a Close Double Degenerate System
• Tidal Interactions in Merging White Dwarf Binaries
• Abundance analyses of cool extreme helium stars
• Simulating Black Hole White Dwarf Encounters
• Conditions For Successful Helium Detonations In Astrophysical Environments
• Reproducing the observed abundances in RCB and HdC stars with post-double degenerate merger models - constraints on merger and post-merger simulations and physics processes
• The QSE-reduced αNetwork
• Locations of Peculiar Supernovae as a Diagnostic of Their Origins
• The galactic population of white dwarfs

Cited by in corpus (122)

• Observational clues to the progenitors of Type-Ia supernovae
• The Evolution of Compact Binary Star Systems
• Hot subluminous stars
• Improving the convergence properties of the moving-mesh code AREPO
• Theoretical uncertainties of the type Ia supernova rate
• Three Hypervelocity White Dwarfs in Gaia DR2: Evidence for Dynamically Driven Double-Degenerate Double-Detonation Type Ia Supernovae
• Pulsating white dwarfs: new insights
• The Initiation and Propagation of Helium Detonations in White Dwarf Envelopes
• A cooling anomaly of high-mass white dwarfs
• The ejected mass distribution of type Ia supernovae: A significant rate of non-Chandrasekhar-mass progenitors
• A highly magnetised and rapidly rotating white dwarf as small as the Moon
• He-Accreting WDs: accretion regimes and final outcomes
• The Evolution and Fate of Super-Chandrasekhar Mass White Dwarf Merger Remnants
• Type Ia Supernovae from Merging White Dwarfs I. Prompt Detonations
• The separation distribution and merger rate of double white dwarfs: improved constraints
• The ESO supernovae type Ia progenitor survey (SPY)
• Evolutionary Models for the Remnant of the Merger of Two Carbon-Oxygen Core White Dwarfs
• A systematic study of carbon-oxygen white dwarf mergers: mass combinations for Type Ia supernovae
• Post-merger evolution of carbon-oxygen + helium white dwarf binaries and the origin of R Coronae Borealis and extreme helium stars
• Double white dwarf merger products among high-mass white dwarfs
• Type Ia supernovae from violent mergers of carbon-oxygen white dwarfs: polarisation signatures
• FBOTs and AT2018cow following electron-capture collapse of merged white dwarfs
• The critical mass ratio of double white dwarf binaries for violent merger-induced Type Ia supernova explosions
• The double-degenerate model for the progenitors of type Ia supernovae
• Type Ia Supernova Sub-classes and Progenitor Origin
• Discovery of the Fastest Early Optical Emission from Overluminous SN Ia 2020hvf: A Thermonuclear Explosion within a Dense Circumstellar Environment
• Population synthesis of helium white dwarf--red giant star mergers and the formation of lithium-rich giants and carbon stars
• The formation of ultra-massive carbon-oxygen core white dwarfs and their evolutionary and pulsational properties
• Dynamical Tides in Compact White Dwarf Binaries: Influence of Rotation
• Nuclear Dominated Accretion Flows in Two Dimensions. II. Ejecta dynamics and nucleosynthesis for CO and ONe white dwarfs
• Thermonuclear detonations ensuing white dwarf mergers
• Hot subdwarfs formed from the merger of two He white dwarfs
• Spiral Disk Instability Can Drive Thermonuclear Explosions in Binary White Dwarf Mergers
• The explosion of supernova 2011fe in the frame of the core-degenerate scenario
• Magnetized Moving Mesh Merger of a Carbon-Oxygen White Dwarf Binary
• Evolutionary models for R Coronae Borealis stars
• On the type Ia supernovae 2007on and 2011iv: Evidence for Chandrasekhar-mass explosions at the faint end of the luminosity-width relationship
• An Isolated White Dwarf with 317-Second Rotation and Magnetic Emission
• White Dwarf Mergers on Adaptive Meshes I. Methodology and Code Verification
• The Lunar Gravitational-wave Antenna: Mission Studies and Science Case
• Discovery of a hot ultramassive rapidly rotating DBA White Dwarf
• The violent white dwarf merger scenario for the progenitors of type Ia supernovae
• Binary Central Stars of Planetary Nebulae Identified With Kepler/K2
• Hydrogen in hot subdwarfs formed by double helium white dwarf mergers
• Nonlinear dynamical tides in white dwarf binaries
• Connecting the Young Pulsars in Milky Way Globular Clusters with White Dwarf Mergers and the M81 Fast Radio Burst
• Smoothed Particle Hydrodynamics simulations of the core-degenerate scenario for Type Ia supernovae
• Impacts of the New Carbon Fusion Cross Sections on Type Ia Supernovae
• The luminous type Ia supernova 2022ilv and its early excess emission
• Radio transients from accretion-induced collapse of white dwarfs
• Light Curves and Spectra from a Thermonuclear Explosion of a White Dwarf Merger
• Prospects for Detecting Fast Radio Bursts in Globular Clusters of Nearby Galaxies
• High-Energy Neutrino Emission from White Dwarf Mergers
• Monte Carlo population synthesis of post-common-envelope white dwarf binaries and type Ia supernova rate
• Formation of ultra-massive carbon-oxygen white dwarfs from the merger of carbon-oxygen and helium white dwarf pairs
• Stellar Core-Merger-Induced Collapse: New Formation Pathways for Black Holes, Thorne-$\dot{\mathrm{Z}}$ytkow objects, Magnetars and Superluminous Supernovae
• Helium ignition in rotating magnetized CO white dwarfs leading to fast and faint rather than classical type Ia supernovae
• The evolution of ultra-massive carbon oxygen white dwarfs
• SCATTER: A New Common Envelope Formalism
• Optical and radio transients after the collapse of super-Chandrasekhar white dwarf merger remnants
• R Coronae Borealis Stars are Viable Factories of Pre-solar Grains
• A fast spinning magnetic white dwarf in the double-degenerate, super-Chandrasekhar system NLTT 12758
• The outcomes of carbon-oxygen white dwarfs accreting CO-rich material
• A Physical Basis for the H-band Blue-edge Velocity and Light-Curve Shape Correlation in Context of Type Ia Supernova Explosion Physics
• An evolutionary channel for CO-rich and pulsating He-rich subdwarfs
• Phase Separation in Ultramassive White Dwarfs
• The origin and evolution of the normal Type Ia SN 2018aoz with infant-phase reddening and excess emission
• Initial Flash and Spectral Formation of Type Ia Supernovae with An Envelope: Applications to Over-luminous SNe Ia
• Normal type Ia supernovae from disruptions of hybrid He-CO white-dwarfs by CO white-dwarfs
• Electromagnetic emission of white dwarf binary mergers
• No double detonations but core carbon ignitions in high-resolution, grid-based simulations of binary white dwarf mergers
• Fast and Luminous Transients from the Explosions of Long Lived Massive White Dwarf Merger Remnants
• The Spin Evolution of Fast-Rotating, Magnetized Super-Chandrasekhar White Dwarfs in the Aftermath of White Dwarf Mergers
• An Ultramassive 1.28 M${}_{\odot }$ White Dwarf in NGC 2099
• Consequence of total lepton number violation in strongly magnetized iron white dwarfs
• A New Merging Double Degenerate Binary in the Solar Neighborhood
• Merging of a CO WD and a He-rich white dwarf to produce a type Ia supernovae
• One-Armed Spiral Instability in Double-Degenerate Post-Merger Accretion Disks
• SN 2018agk: A Prototypical Type Ia Supernova with a Smooth Power-law Rise in Kepler (K2)
• A magnetic white-dwarf accretion model for the anomalous X-ray pulsar 4U 0142+61
• The role of dredge-up in double white dwarf mergers
• Post-merger evolution of double helium white dwarfs and distribution of helium-rich hot subdwarfs
• A Comparison of Grid-Based and SPH Binary Mass-Transfer and Merger Simulations
• Carbon Detonation Initiation in Turbulent Electron-Degenerate Matter
• AREPO White Dwarf merger simulations resulting in edge-lit detonation and run-away hypervelocity companion
• Exploration of Aspherical Ejecta Properties in Type Ia Supernova: Progenitor Dependence and Applications to Progenitor Classification
• Minute-Cadence Observations of the LAMOST Fields with the TMTS: II. Catalogues of Short-Period Variable Stars from the First Two-Year Surveys
• Looking into the cradle of the grave: J22564-5910, a young post-merger hot subdwarf?
• The double white dwarf merger progenitors of SDSS J2211+1136 and ZTF J1901+1458
• Circumstellar properties of Type Ia supernovae from the helium star donor channel
• Rotating white dwarf models with finite-temperature envelope
• SALT revisits DY Cen: a rapidly-evolving strontium-rich single helium star
• White dwarf dynamical interactions and fast optical transients
• Two New White Dwarfs With Variable Magnetic Balmer Emission Lines
• Detonability of white dwarf plasma: turbulence models at low densities
• Magnetic White Dwarfs: Observations, Theory, and Future Prospects
• Differentially Rotating White Dwarfs I: Regimes of Internal Rotation
• Single Millisecond Pulsars from Dynamical Interaction Processes in Dense Star Clusters
• VTC J095517.5+690813: A radio transient from an accretion-induced collapse of a white dwarf?
• On the optical transients from double white-dwarf mergers
• Repeated partial disruptions in a WD-NS or WD-BH merger modulate the prompt emission of long-duration merger-type GRBs
• The Formation of Electron-capture Supernovae: A Review
• The distribution, kinematics and luminosities of extreme helium stars as probes of their origin and evolution
• The white dwarf binary merger model of GRB 170817A
• A Semi-analytic Criterion for the Spontaneous Initiation of Carbon Detonations in White Dwarfs
• Prospects for the Observation of Continuous Gravitational Waves from Deformed Fast-spinning White Dwarfs
• Comparing the Space Densities of Millisecond-Spin Magnetars and Fast X-Ray Transients
• A half-ring of ionized circumstellar material trapped in the magnetosphere of a white dwarf merger remnant
• SPH Methods in the Modelling of Compact Objects
• Identifying Disappearance of a White Dwarf Binary with LISA
• Exploring Temperature Influences on Gravitational Wave Production in Binary White Dwarfs
• Modeling Solids in Nuclear Astrophysics with Smoothed Particle Hydrodynamics
• Ultrashort-period WD binaries are not undergoing strong tidal heating
• Merged white dwarfs and nucleosynthesis
• Evidence of .Ia Supernova Detonations in 3D Hydrodynamical Simulations of Double Degenerate Mergers
• How an overweight and rapidly rotating PG 1159 star in the Galactic halo challenges evolutionary models
• Stars on the ascending helium giant branch I. From white dwarf merger to helium giant: the evolutionary state of the rapidly rotating hot subdwarf HE 1518-0948
• Halted-Pendulum Relaxation: Application to White Dwarf Binary Initial Data
• The Differences between Analytical and Numerical Ignition Curve of He-C-O Mixture
• Chirping compact stars: gravitational radiation and detection degeneracy with binary systems A conceptual pathfinder for space-based gravitational-wave observatories
• The final fates of close hot subdwarf - white dwarf binaries: mergers involving He/C/O white dwarfs and the formation of unusual giant stars with C/O-dominated envelopes
• Optical transients from non-explosive double white-dwarf mergers: the case of a central neutron star remnant