Survival times of supramassive neutron stars resulting from binary neutron star mergers

Abstract

A binary neutron star (BNS) merger can lead to various outcomes, from indefinitely stable neutron stars, through supramassive (SMNS) or hypermassive (HMNS) neutron stars supported only temporarily against gravity, to black holes formed promptly after the merger. Up-to-date constraints on the BNS total mass and the neutron star equation of state suggest that a long-lived SMNS may form in $\sim 0.45-0.9$ of BNS mergers. A maximally rotating SMNS needs to lose $\sim 3-6\times 10^{52}$ erg of it's rotational energy before it collapses, on a fraction of the spin-down timescale. A SMNS formation imprints on the electromagnetic counterparts to the BNS merger. However, a comparison with observations reveals tensions. First, the distribution of collapse times is too wide and that of released energies too narrow (and the energy itself too large) to explain the observed distributions of internal X-ray plateaus, invoked as evidence for SMNS-powered energy injection. Secondly, the immense energy injection into the blastwave should lead to extremely bright radio transients which previous studies found to be inconsistent with deep radio observations of short gamma-ray bursts. Furthermore, we show that upcoming all-sky radio surveys will constrain the extracted energy distribution, independently of a GRB jet formation. Our results can be self-consistently understood, provided that most BNS merger remnants collapse shortly after formation (even if their masses are low enough to allow for SMNS formation). This naturally occurs if the remnant retains half or less of its initial energy by the time it enters solid body rotation.

arXiv commentAccepted for publication in ApJ

References in corpus (92)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Cosmic Star Formation History
• Relativistic Shapiro delay measurements of an extremely massive millisecond pulsar
• A unified equation of state of dense matter and neutron star structure
• Tests of general relativity from timing the double pulsar
• The GMRT 150 MHz All-sky Radio Survey: First Alternative Data Release TGSS ADR1
• Supernova Light Curves Powered by Young Magnetars
• Constraining the Maximum Mass of Neutron Stars From Multi-Messenger Observations of GW170817
• Using gravitational-wave observations and quasi-universal relations to constrain the maximum mass of neutron stars
• Gamma-ray Burst Afterglow with Continuous Energy Injection: Signature of a Highly-Magnetized Millisecond Pulsar
• The Proto-Magnetar Model for Gamma-Ray Bursts
• Swift detects a remarkable gamma-ray burst, GRB 060614, that introduces a new classification scheme
• Comparing Models of Rapidly Rotating Relativistic Stars Constructed by Two Numerical Methods
• Timing Measurements of the Relativistic Binary Pulsar PSR B1913+16
• Modeling GW170817 based on numerical relativity and its implications
• Binary Neutron Star Mergers: Mass Ejection, Electromagnetic Counterparts and Nucleosynthesis
• Radio Remnants of Compact Binary Mergers - the Electromagnetic Signal that will follow the Gravitational Waves
• Accurate evolutions of inspiralling neutron-star binaries: prompt and delayed collapse to black hole
• Merger of binary neutron stars to a black hole: Disk mass, short gamma-ray bursts, and quasinormal mode ringing
• Maximum mass, moment of inertia and compactness of relativistic stars
• Remnant massive neutron stars of binary neutron star mergers: Evolution process and gravitational waveform
• Optical and X-ray emission from stable millisecond magnetars formed from the merger of binary neutron stars
• The Electromagnetic Signals of Compact Binary Mergers
• Gravitational waves and neutrino emission from the merger of binary neutron stars
• The Diversity of Transients from Magnetar Birth
• Multi-messenger Bayesian parameter inference of a binary neutron-star merger
• Pulsar J0453+1559: A Double Neutron Star System with a Large Mass Asymmetry
• The Millisecond Magnetar Central Engine in short GRBs
• Merger and Mass Ejection of Neutron-Star Binaries
• Bright "merger-nova" from the remnant of a neutron star binary merger: A signature of a newly born, massive, millisecond magnetar
• Mass Ejection from the Remnant of a Binary Neutron Star Merger: Viscous-Radiation Hydrodynamics Study
• The unusual X-ray emission of the short Swift GRB 090515: Evidence for the formation of a magnetar?
• Global simulations of strongly magnetized remnant massive neutron stars formed in binary neutron star mergers
• High resolution numerical-relativity simulations for the merger of binary magnetized neutron stars
• Formation of Stable Magnetars from Binary Neutron Star Mergers
• The Observable Signatures of GRB Cocoons
• Early X-ray and optical afterglow of gravitational wave bursts from mergers of binary neutron stars
• Studies of the Relativistic Binary Pulsar PSR B1534+12: I. Timing Analysis
• Neutron Star Mergers as sites of r-process Nucleosynthesis and Short Gamma-Ray Bursts
• GRB Afterglows with Energy Injection from a spinning down NS
• Rotational properties of hypermassive neutron stars from binary mergers
• PALFA Discovery of a Highly Relativistic Double Neutron Star Binary
• General-Relativistic Large-Eddy Simulations of Binary Neutron Star Mergers
• PSR J1756-2251: a new relativistic double neutron star system
• The electromagnetic counterparts of compact binary mergers
• Can the early X-ray afterglow of GRBs be explained by a contribution from the reverse shock?
• Implications of the Early X-Ray Afterglow Light Curves of Swift GRBs
• First 100 ms of a long-lived magnetized neutron star formed in a binary neutron star merger
• Threshold for Extended Emission in Short Gamma-Ray Bursts
• Stability of magnetic fields in non-barotropic stars: an analytic treatment
• The young, highly relativistic binary pulsar J1906+0746
• The Multi-Messenger Matrix: the Future of Neutron Star Merger Constraints on the Nuclear Equation of State
• Efficiency Crisis of Swift Gamma-Ray Bursts with Shallow X-ray Afterglows: Prior Activity or Time-Dependent Microphysics?
• The Caltech-NRAO Stripe 82 Survey (CNSS) Paper I: The Pilot Radio Transient Survey In 50 deg${}^2$
• Long-lived Remnants from Binary Neutron Star Mergers
• Effects of Fall-Back Accretion on Proto-Magnetar Outflows in Gamma-Ray Bursts and Superluminous Supernovae
• Bright broad-band afterglows of gravitational wave bursts from mergers of binary neutron stars
• Synchrotron radiation from the fast tail of dynamical ejecta of neutron star mergers
• The Influence of Thermal Pressure on Equilibrium Models of Hypermassive Neutron Star Merger Remnants
• General relativistic viscous hydrodynamics of differentially rotating neutron stars
• The Case for Anisotropic Afterglow Efficiency within Gamma-Ray Burst Jets
• Multi-telescope timing of PSR J1518+4904
• Lessons from the short GRB170817A - the First Gravitational Wave Detection of a Binary Neutron Star Merger
• The High Time Resolution Universe Pulsar Survey - XIII. PSR J1757-1854, the most accelerated binary pulsar
• How loud are neutron star mergers?
• On the magnetar origin of the GRBs presenting X-ray afterglow plateaus
• Arecibo timing and single-pulse observations of 17 pulsars
• A novel paradigm for short gamma-ray bursts with extended X-ray emission
• Possible detection of hard X-ray afterglows of short gamma-ray bursts
• A lesson from GW170817: most neutron star mergers result in tightly collimated successful GRB jets
• The Green Bank North Celestial Cap Pulsar Survey III: 45 New Pulsar Timing Solutions
• Einstein@Home discovery of a Double-Neutron Star Binary in the PALFA Survey
• X-ray Plateaus in Gamma Ray Bursts' light-curves from jets viewed slightly off-axis
• Collimated outflows from long-lived binary neutron star merger remnants
• The Gravitational waves merger time distribution of binary neutron star systems
• Constraints on long-lived remnants of neutron star binary mergers from late-time radio observations of short duration gamma-ray bursts
• A Late-Time Flattening of Light Curves in Gamma-Ray Burst Afterglows
• Structured Jets and X-ray Plateaus in Gamma-Ray Burst Phenomena
• Double Neutron Star Mergers and Short Gamma-Ray Bursts: Long-Lasting High-Energy Signatures and Remnant Dichotomy
• Testing the Magnetar Model via Late Time Radio Observations of Two Macronova Candidates
• A Search for Neutron Star-Black Hole Binary Mergers in the Short Gamma-Ray Burst Population
• Radio Constraints on Long-Lived Magnetar Remnants in Short Gamma-Ray Bursts
• Constraints on millisecond magnetars as the engines of prompt emission in gamma-ray bursts
• Observable Features of GW170817 Kilonova Afterglow
• Constraints on the circumburst environments of short gamma-ray bursts
• Radio Transients from the Accretion Induced Collapse of White Dwarfs
• Searching for the radio remnants of short duration gamma-ray bursts
• Ready, set, launch: time interval between BNS merger and short GRB jet formation
• Coasting external shock in wind medium: an origin for the X-ray plateau decay component in Swift GRB afterglows
• The Allen Telescope Array Pi GHz Sky Survey I. Survey Description and Static Catalog Results for the Bootes Field
• Radio SNRs in the Magellanic Clouds as probes of shock microphysics

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• Central engine of GRB170817A: Neutron star versus Kerr black hole based on multimessenger calorimetry and event timing
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