Delayed jet breakouts from binary neutron star mergers

Abstract

Short gamma-ray bursts (sGRBs) are thought to be produced by binary NS mergers. While a sGRB requires a relativistic jet to break out of ejecta, the jet may be choked and fails to produce a successful sGRB. We propose a "delayed breakout" scenario where a late-time jet launched by a long-term engine activity can penetrate ejecta even if a prompt jet is choked. Observationally, such a late-time jet is supported by the long-lasting high-energy emissions in sGRBs. Solving the jet propagation in ejecta, we show that a typical late-time activity easily achieves the delayed breakout. This event shows not prompt $\gamma$-rays but long-time X-ray emissions for $\sim 10^{2-3}\mathrm{s}$ or even $\sim 10^{4-5}\mathrm{s}$. Some delayed events may be already detected as soft-long GRBs without supernova signatures. In an optimistic case, a few events coincident with gravitational-waves (GWs) are detected by the second-generation GW detectors every year. X-ray followups of merger events without $\gamma$-rays will be a probe of long-lasting engine activities in binary mergers.

arXiv comment7 pages, 2 figures, accepted for publication in ApJL !!!

References in corpus (44)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Swope Supernova Survey 2017a (SSS17a), the Optical Counterpart to a Gravitational Wave Source
• Short-Duration Gamma-Ray Bursts
• Short-Hard Gamma-Ray Bursts
• Illuminating Gravitational Waves: A Concordant Picture of Photons from a Neutron Star Merger
• The mass ejection from the merger of binary neutron stars
• A Decade of Short-duration Gamma-ray Burst Broad-band Afterglows: Energetics, Circumburst Densities, and Jet Opening Angles
• Signatures of magnetar central engines in short GRB lightcurves
• Short Gamma-Ray Bursts with Extended Emission
• Short Duration Gamma-Ray Bursts with Extended Emission from Proto-Magnetar Spin-Down
• Late time afterglow observations reveal a collimated relativistic jet in the ejecta of the binary neutron star merger GW170817
• The propagation of relativistic jets in external media
• The rate, luminosity function and time delay of non-Collapsar short GRBs
• Short GRBs with Extended Emission from Magnetar Birth: Jet Formation and Collimation
• Supernova Hosts for Gamma-Ray Burst Jets: Dynamical Constraints
• J-GEM observations of an electromagnetic counterpart to the neutron star merger GW170817
• Jet collimation in the ejecta of double neutron star merger: new canonical picture of short gamma-ray bursts
• GRB 080503: Implications of a Naked Short Gamma-Ray Burst Dominated by Extended Emission
• Fallback accretion in the aftermath of a compact binary merger
• Variabilities of Gamma-Ray Burst Afterglows: Long-acting Engine, Anisotropic Jet or Many Fluctuating Regions?
• Magnetar powered GRBs: Explaining the extended emission and X-ray plateau of short GRB light curves
• Gravitational Waves and $\gamma$-Ray Bursts
• Opening Angles of Collapsar Jets
• Necessary Conditions for Short Gamma-Ray Burst Production in Binary Neutron Star Mergers
• An observational imprint of the Collapsar model of long Gamma Ray Bursts
• Can magnetar spin-down power extended emission in some short GRBs?
• In-Orbit Performance of MAXI Gas Slit Camera (GSC) on ISS
• High-Energy Neutrino Emission from Short Gamma-Ray Bursts: Prospects for Coincident Detection with Gravitational Waves
• A New, Faint Population of X-ray Transients
• Numerically calibrated model for propagation of a relativistic unmagnetized jet in dense media
• Model of extended emission of short Gamma-ray Bursts
• The GRB-SLSN Connection: mis-aligned magnetars, weak jet emergence, and observational signatures
• Measuring the viewing angle of GW170817 with electromagnetic and gravitational waves
• Fallback Accretion onto a Newborn Magnetar: short GRBs with Extended Emission
• Bimodal Long-Lasting Components in Short Gamma-Ray Bursts: Promising Electromagnetic Counterparts to Neutron Star Binary Mergers
• Long-Lasting Black-Hole Jets in Short Gamma-Ray Bursts
• The orbit of GW170817 was inclined by less than 28 degrees to the line of sight
• Low Lorentz Factor Jets from Compact Stellar Mergers - Candidate Electromagnetic Counterparts to Gravitational Wave Sources
• Observational evidence for mass ejection accompanying short gamma ray bursts
• Is the macronova in GW170817 powered by the central engine?
• MAXI observations of GRBs
• Determine the Lorentz factor and the viewing angle of GRB 170817A
• Soft X-ray Extended Emissions of Short Gamma-Ray Bursts as Electromagnetic Counterparts of Compact Binary Mergers; Possible Origin and Detectability
• Using ISS Telescopes for Electromagnetic Follow-up of Gravitational Wave Detections of NS-NS and NS-BH Mergers

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• Gamma-ray burst jet propagation, development of angular structure, and the luminosity function
• Implications of the search for optical counterparts during the second part of the Advanced LIGO's and Advanced Virgo's third observing run: lessons learned for future follow-up observations
• Jet-cocoon outflows from neutron star mergers: structure, light curves, and fundamental physics
• GRB 170817A as a Refreshed Shock Afterglow viewed off-axis
• Upscattered Cocoon Emission in Short Gamma-ray Bursts as High-energy Gamma-ray Counterparts to Gravitational Waves
• Linking extended and plateau emissions of short gamma-ray bursts
• High-energy neutrino emission subsequent to gravitational wave radiation from supermassive black hole mergers
• Gravitational-wave memory from a propagating relativistic jet: a probe of the interior of gamma-ray burst progenitors
• Propagation of GRB Relativistic Jets in AGN Disks and Its Implication for GRB Detection
• High-energy neutrino emission associated with gravitational-wave signals: effects of cocoon photons and constraints on late-time emission
• Conditions for jet break-out in NS mergers
• High-energy emissions from neutron star mergers