Gravitational waves from post-merger radially-oscillating millisecond pulsars

Abstract

Observations of short-duration gamma-ray bursts and their afterglows show that a good fraction (perhaps $\gtrsim 50\%$) of binary neutron star mergers lead to strongly magnetized, rapidly rotating pulsars (including millisecond magnetars), no matter whether the pulsar remnants are short- or long-lived. Such compact objects are very likely to have significant radial oscillations and high interior temperatures, as indicated in recent numerical simulations. In this paper, we have investigated rotation-induced gravitational radiation from possibly existing, radially oscillating pulsars after binary neutron star mergers, and find that this mechanism can efficiently damp the radial oscillations. The resulting gravitational waves (GWs) could have a non-negligible contribution to the high-frequency spectrum. We provide an order-of-magnitude estimate of the event rate and suggest that such GW events would be detectable with the advanced LIGO/Virgo or next-generation detectors. Our discussion can also be applied to newborn, radially oscillating, millisecond pulsars formed through the other astrophysical processes.

5 pages, 1 figure, published in Astronomy & Astrophysics

References in corpus (21)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Multi-messenger Observations of a Binary Neutron Star Merger
• 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
• X-Ray Flares from Postmerger Millisecond Pulsars
• Spectral properties of the post-merger gravitational-wave signal from binary neutron stars
• Search for post-merger gravitational waves from the remnant of the binary neutron star merger GW170817
• A magnetar origin for the kilonova ejecta in GW170817
• GRB afterglow plateaus and Gravitational Waves: multi-messenger signature of a millisecond magnetar?
• A long-lived neutron star merger remnant in GW170817: constraints and clues from X-ray observations
• A long-lived remnant neutron star after GW170817 inferred from its associated kilonova
• Inferring the post-merger gravitational wave emission from binary neutron star coalescences
• Spinning down newborn neutron stars: nonlinear development of the r-mode instability
• Gravitational-wave luminosity of binary neutron stars mergers
• The allowed parameter space of a long-lived neutron star as the merger remnant of GW170817
• Gravitational waves from remnant massive neutron stars of binary neutron star merger: Viscous hydrodynamics effects
• Observing the post-merger signal of GW170817-like events with improved gravitational-wave detectors
• What Powered the Optical Transient AT2017gfo Associated with GW170817?
• Using gravitational-wave data to constrain dynamical tides in neutron star binaries
• Brightening X-ray/Optical/Radio Emission of GW170817/SGRB 170817A: Results of an Electron-Positron Wind from the Central Engine?
• Observational evidence for Extended Emission to GW170817
• Magnetic-distortion-induced ellipticity and gravitational wave radiation of neutron stars: millisecond magnetars in short GRBs, Galactic pulsars, and magnetars

Cited by in corpus (4)

• Probing elastic quark phases in hybrid stars with radius measurements
• Central engine of GRB170817A: Neutron star versus Kerr black hole based on multimessenger calorimetry and event timing
• Gravitational Waves from Newborn Accreting Millisecond Magnetars
• Neutron Star Merger Remnants: Braking Indices, Gravitational Waves, and the Equation Of State