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We expand on our study of the gravitational and electromagnetic emissions from the late stage of an inspiraling neutron star binary as presented in Ref. \cite{Palenzuela:2013hu}. Interactions between the stellar magnetospheres, driven by…

General Relativity and Quantum Cosmology · Physics 2013-09-13 Carlos Palenzuela , Luis Lehner , Steven L. Liebling , Marcelo Ponce , Matthew Anderson , David Neilsen , Patrick Motl

We investigate energy release in the interacting magnetospheres of binary neutron stars (BNSs) with global 3D force-free electrodynamics simulations. The system dynamics depend on the inclinations $\chi_1$ and $\chi_2$ of the stars'…

High Energy Astrophysical Phenomena · Physics 2025-03-03 Jens F. Mahlmann , Andrei M. Beloborodov

The recent detection of gravitational waves associated with a binary neutron star merger revives interest in interacting pulsar magnetospheres. Current models predict that a significant amount of magnetic energy should be released prior to…

High Energy Astrophysical Phenomena · Physics 2019-02-20 Benjamin Crinquand , Benoît Cerutti , Guillaume Dubus

We consider electromagnetic interaction and precursor emission of merging neutron stars. Orbital motion of the magnetized neutron stars may revive pair production within the common magnetosphere years before the merger, igniting pulsar-like…

High Energy Astrophysical Phenomena · Physics 2019-12-06 Maxim Lyutikov

Binary neutron star mergers are expected to generate intense magnetic fields that power relativistic and non-relativistic outflows and shape their multimessenger signatures. These fields likely arise from the turbulent amplification of…

High Energy Astrophysical Phenomena · Physics 2026-01-30 Eduardo M. Gutiérrez , David Radice , Jacob Fields , James M. Stone

The merger of a neutron star (NS) binary may result in the formation of a long-lived, or indefinitely stable, millisecond magnetar remnant surrounded by a low-mass ejecta shell. A portion of the magnetar's prodigious rotational energy is…

High Energy Astrophysical Phenomena · Physics 2017-11-10 Ke Fang , Brian D. Metzger

We present the first 3D global kinetic simulations of the interacting magnetospheres of pre-merger binary neutron stars. The stars, whose magnetic moments are anti-aligned, twist the field lines connecting them, leading to periodic…

High Energy Astrophysical Phenomena · Physics 2026-04-27 Jasmine Parsons , Anatoly Spitkovsky , Alexander Philippov , Hayk Hakobyan

Neutrino interactions play a central role in transport and flavor evolution in the ejecta of binary neutron star mergers. Simulations suggest that neutron star mergers may produce magnetic fields as strong as $10^{17}$ G, but computational…

High Energy Astrophysical Phenomena · Physics 2026-04-10 Mia Kumamoto , Catherine Welch

The oscillation modes of neutron star (NS) merger remnants, as encoded by the kHz postmerger gravitational wave (GW) signal, hold great potential for constraining the as-yet undetermined equation of state (EOS) of dense nuclear matter.…

General Relativity and Quantum Cosmology · Physics 2025-02-28 Jamie Bamber , Antonios Tsokaros , Milton Ruiz , Stuart L. Shapiro

By performing fully general relativistic magnetohydrodynamic simulations of binary neutron star mergers, we investigate the possibility that the end result of the merger is a stable magnetar. In particular, we show that, for a binary…

High Energy Astrophysical Phenomena · Physics 2013-06-27 Bruno Giacomazzo , Rosalba Perna

We investigate the influence of magnetic fields upon the dynamics of and resulting gravitational waves from a binary neutron star merger in full general relativity coupled to ideal magnetohydrodynamics (MHD). We consider two merger…

General Relativity and Quantum Cosmology · Physics 2008-11-26 Matthew Anderson , Eric W. Hirschmann , Luis Lehner , Steven L. Liebling , Patrick M. Motl , David Neilsen , Carlos Palenzuela , Joel E. Tohline

We investigate emission signatures of binary compact star gravitational wave sources consisting of strongly magnetized neutron stars (NSs) and/or white dwarfs (WDs) in their late-time inspiral phase. Because of electromagnetic interactions…

High Energy Astrophysical Phenomena · Physics 2018-11-21 Jie-Shuang Wang , Fang-Kun Peng , Kinwah Wu , Zi-Gao Dai

We demonstrate that magnetospheric interactions between merging neutron stars (NSs) generate dual-jetted current outflows, analogous to the Alfv\'{e}n wings observed during planetary interactions in the Solar System. Using 3D relativistic…

High Energy Astrophysical Phenomena · Physics 2026-02-19 Praveen Sharma , Slava G. Turyshev , Maxim V. Barkov , Maxim Lyutikov

Highly eccentric binary neutron star mergers exhibit unique dynamical and observational signatures compared to quasi-circular ones in terms of their gravitational wave signal and the ejection of matter, leading to different electromagnetic…

General Relativity and Quantum Cosmology · Physics 2025-04-15 Anna Neuweiler , Tim Dietrich , Bernd Brügmann

In the late inspiral phase of a double neutron star (NS) or NS-black hole system in which one NS is a magnetar, the tidal force on the magnetar arisen from its companion will increase dramatically as the binary approaches. The tidal-induced…

High Energy Astrophysical Phenomena · Physics 2022-11-07 Zhen Zhang , Shu-Xu Yi , Shuang-Nan Zhang , Shao-Lin Xiong , Shuo Xiao

The merger of binary neutron stars (BNSs) can lead to large amplifications of the magnetic field due to the development of turbulence and instabilities in the fluid, such as the Kelvin-Helmholtz shear instability, which drive small-scale…

High Energy Astrophysical Phenomena · Physics 2015-09-09 Bruno Giacomazzo , Jonathan Zrake , Paul Duffell , Andrew I. MacFadyen , Rosalba Perna

The late stage of an inspiraling neutron star binary gives rise to strong gravitational wave emission due to its highly dynamic, strong gravity. Moreover, interactions between the stellar magnetospheres can produce considerable…

General Relativity and Quantum Cosmology · Physics 2013-08-27 Carlos Palenzuela , Luis Lehner , Marcelo Ponce , Steven L. Liebling , Matthew Anderson , David Neilsen , Patrick Motl

The simultaneous detection of electromagnetic and gravitational wave emission from merging neutron star binaries would aid greatly in their discovery and interpretation. By studying turbulent amplification of magnetic fields in local…

High Energy Astrophysical Phenomena · Physics 2015-06-15 Jonathan Zrake , Andrew I. MacFadyen

We study the dependence of the electromagnetic luminosity --produced by interactions of force-free magnetospheres-- on dipole inclinations in binary neutron star systems. We show that this interaction extracts kinetic energy from the system…

General Relativity and Quantum Cosmology · Physics 2014-08-06 Marcelo Ponce , Carlos Palenzuela , Luis Lehner , Steven L. Liebling

It is an open question whether and how gravitational wave events involving neutron stars can be preceded by electromagnetic counterparts. This work shows that the collision of two neutron stars with magnetic fields well below magnetar-level…

High Energy Astrophysical Phenomena · Physics 2023-06-21 Elias R. Most , Alexander A. Philippov
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