A Late-time Radio Survey of Short GRBs at $z<0.5$: New Constraints on the Remnants of Neutron Star Mergers

Abstract

Massive, rapidly-spinning magnetar remnants produced as a result of binary neutron star (BNS) mergers may deposit a fraction of their energy into the surrounding kilonova ejecta, powering a synchrotron radio signal from the interaction of the ejecta with the circumburst medium. We present 6.0 GHz Very Large Array (VLA) observations of nine, low-redshift short gamma-ray bursts (SGRBs; $z<0.5$) on rest-frame timescales of $\approx 2.4-13.9$ yr following the bursts. We place $3\sigma$ limits on radio continuum emission of $F_{\nu }\lesssim 6-20\mu$Jy at the burst positions, or $L_{\nu }\lesssim (0.6-8.3)\times 10^{28}$erg s${}^{-1}$Hz${}^{-1}$. Comparing these limits with new light curve modeling which properly incorporates relativistic effects, we obtain limits on the energy deposited into the ejecta of $E_{ej}\lesssim (0.6-6.7)\times 10^{52}$erg ($E_{ej}\lesssim (1.8-17.6)\times 10^{52}$erg) for an ejecta mass of $0.03M_{\odot }$ ($0.1M_{\odot }$). We present a uniform re-analysis of 27 SGRBs with $5.5-6.0$ GHz observations, and find that $\gtrsim 50\%$ of SGRBs did not form stable magnetar remnants in their mergers. Assuming SGRBs are produced by BNS mergers drawn from the Galactic BNS population plus an additional component of high-mass GW194025-like mergers in a fraction $f_{GW190425}$ of cases, we place constraints on the maximum mass of a non-rotating neutron star (NS) ($M_{TOV}$), finding $M_{TOV}\lesssim 2.23M_{\odot }$ for $f_{GW190425}=0.4$; this limit increases for larger values of $f_{GW190425}$. The detection (or lack thereof) of radio remnants in untargeted surveys such as the VLA Sky Survey (VLASS) could provide more stringent constraints on the fraction of mergers that produce stable remnants. If $\gtrsim 30-300$ radio remnants are discovered in VLASS, this suggests that SGRBs are a biased population of BNS mergers in terms of the stability of the remnants they produce.

21 pages, 7 figures, submitted to ApJ

References in corpus (30)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• Constraining the Maximum Mass of Neutron Stars From Multi-Messenger Observations of GW170817
• The Combined Ultraviolet, Optical, and Near-Infrared Light Curves of the Kilonova Associated with the Binary Neutron Star Merger GW170817: Unified Data Set, Analytic Models, and Physical Implications
• Particle acceleration in relativistic collisionless shocks: Fermi process at last?
• Modeling GW170817 based on numerical relativity and its implications
• The 1% Concordance Hubble Constant
• Short Duration Gamma-Ray Bursts with Extended Emission from Proto-Magnetar Spin-Down
• Merger of binary neutron stars to a black hole: Disk mass, short gamma-ray bursts, and quasinormal mode ringing
• Kilonova Light Curves from the Disk Wind Outflows of Compact Object Mergers
• Post-correlation radio frequency interference classification methods
• The Millisecond Magnetar Central Engine in short GRBs
• Black Hole-Neutron Star Mergers: Disk Mass Predictions
• High resolution numerical-relativity simulations for the merger of binary magnetized neutron stars
• Mass ejection from neutron star mergers: different components and expected radio signals
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. VIII. A Comparison to Cosmological Short-duration Gamma-ray Bursts
• Gamma Ray Bursts Are Observed Off-Axis
• The Properties of Short gamma-ray burst Jets Triggered by neutron star mergers
• Electrons' energy in GRB afterglows implied by radio peaks
• A Putative Early-Type Host Galaxy for GRB 060502B: Implications for the Progenitors of Short-Duration Hard-Spectrum Bursts
• GRMHD simulations of prompt-collapse neutron star mergers: the absence of jets
• Radio Constraints on Long-Lived Magnetar Remnants in Short Gamma-Ray Bursts
• Gravitational waves or deconfined quarks: what causes the premature collapse of neutron stars born in short gamma-ray bursts?
• Constraints on the circumburst environments of short gamma-ray bursts
• Shock within a shock: revisiting the radio flares of NS merger ejecta and GRB-supernovae
• A long optical plateau in the afterglow of the Extended Emission short GRB 150424A: Evidence for energy injection by a magnetar?
• Constraining the long-lived magnetar remnants in short gamma-ray bursts from late-time radio observations
• Deep ATCA and VLA radio observations of short-GRB host galaxies. Constraints on star-formation rates, afterglow flux, and kilonova radio flares

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• Short GRB Host Galaxies. II. A Legacy Sample of Redshifts, Stellar Population Properties, and Implications for their Neutron Star Merger Origins
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• Probing Kilonova Ejecta Properties Using a Catalog of Short Gamma-Ray Burst Observations
• Thermal Electrons in Mildly-relativistic Synchrotron Blast-waves
• Angular Momentum Transport in Proto-Neutron Stars and the Fate of Neutron Star Merger Remnants
• Ab-Initio General-Relativistic Neutrino-Radiation Hydrodynamics Simulations of Long-Lived Neutron Star Merger Remnants to Neutrino Cooling Timescales
• Searching for the radio remnants of short duration gamma-ray bursts
• On the diversity of magnetar-driven kilonovae
• "Super-Kilonovae" from Massive Collapsars as Signatures of Black-Hole Birth in the Pair-instability Mass Gap
• A Late-Time Galaxy-Targeted Search for the Radio Counterpart of GW190814
• Neutron stars and the dense matter equation of state: from microscopic theory to macroscopic observations
• A collapsar origin for GRB 211211A is (just barely) possible
• Electromagnetic counterparts of binary neutron star mergers leading to a strongly magnetized long-lived remnant neutron star
• The distant, galaxy cluster environment of the short GRB 161104A at $z\sim 0.8$ and a comparison to the short GRB host population
• External Inverse-Compton Emission Associated with Extended and Plateau Emission of Short Gamma-Ray Bursts: Application to GRB 160821B
• Late-time accretion in neutron star mergers: implications for short gamma-ray bursts and kilonovae
• Extragalactic Millimeter Transients in the Era of Next Generation CMB Surveys
• Turbulence modelling in neutron star merger simulations
• Late-time radio observations of the short GRB200522A: constraints on the magnetar model
• Late-Time Evolution and Modeling of the Off-Axis Gamma-ray Burst Candidate FIRST J141918.9+394036
• Afterglow light curves of the non-relativistic ejecta mass in a stratified circumstellar medium
• Multi-Peaked Non-Thermal Light Curves from Magnetar-Powered Gamma-Ray Bursts
• Search for radio remnants of nearby off-axis Gamma-Ray Bursts in a sample of Swift/BAT events
• VLT/MUSE and ATCA observations of the host galaxy of the short GRB 080905A at z=0.122
• A search for kilonova radio flares in a sample of Swift/BAT short GRBs
• Comparing the Space Densities of Millisecond-Spin Magnetars and Fast X-Ray Transients
• Features and prospects for kilonova remnant detection with current and future surveys
• Numerical Modeling of Relativistic Effects in Synchrotron-Emitting Shocks