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Observations of short-duration gamma-ray bursts and their afterglows show that a good fraction (perhaps $\gtrsim50\%$) of binary neutron star mergers lead to strongly magnetized, rapidly rotating pulsars (including millisecond magnetars),…

High Energy Astrophysical Phenomena · Physics 2019-02-22 Z. G. Dai

The gravitational wave signals of black hole-neutron star (BHNS) binary systems have now been detected, and future detections might be accompanied by electromagnetic counterparts. BHNS mergers involve much of the same physics as binary…

High Energy Astrophysical Phenomena · Physics 2024-04-24 Matthew D. Duez

The next generation of gravitational wave detectors and electromagnetic telescopes are beckoning the onset of the multi-messenger era and the exciting science that lies ahead. Multi-messenger strong gravitational lensing will help probe…

Cosmology and Nongalactic Astrophysics · Physics 2025-02-05 Anupreeta More , Hemantakumar Phurailatpam

We analytically study the properties of the electromagnetic field in vacuum around close binary compact stars containing at least one neutron star. We show that the orbital motion of the neutron star induces high multipole modes of the…

High Energy Astrophysical Phenomena · Physics 2022-09-16 Tomoki Wada , Masaru Shibata , Kunihito Ioka

The detection of the binary neutron star (BNS) merger, GW170817, was the first success story of multi-messenger observations of compact binary mergers. The inferred merger rate along with the increased sensitivity of the ground-based…

Instrumentation and Methods for Astrophysics · Physics 2020-06-24 Deep Chatterjee , Shaon Ghosh , Patrick R. Brady , Shasvath J. Kapadia , Andrew L. Miller , Samaya Nissanke , Francesco Pannarale

In this article, I introduce ideas and techniques to extract information about the equation of state of matter at very high densities from gravitational waves emitted before, during and after the merger of binary neutron stars. I also…

High Energy Astrophysical Phenomena · Physics 2019-09-30 Luca Baiotti

In the vicinity of merging neutron strar binaries or supernova remnants, gravitational waves can interact with the prevailing strong magnetic fields. The resulting partial conversion of gravitational waves into electromagnetic (radio) waves…

General Relativity and Quantum Cosmology · Physics 2007-05-23 Joachim Moortgat

Continuous gravitational waves from rapidly rotating neutron stars are on the new frontiers of gravitational wave astrophysics and have strong connections to electromagnetic astronomy, nuclear astrophysics, and condensed matter physics. In…

General Relativity and Quantum Cosmology · Physics 2026-03-13 Benjamin J. Owen

As technology has improved, binary neutron star systems have been observed more frequently, in fact, the first gravitational wave to have an electromagnetic counterpart originated from the merger of two neutron stars (GW170817). Detecting…

Instrumentation and Methods for Astrophysics · Physics 2022-11-18 Jeshwanth Mohan

Neutron star binaries offer a rich phenomenology in terms of gravitational waves and merger remnants. However, most general relativistic studies have been performed for nearly circular binaries, with the exception of head-on collisions. We…

General Relativity and Quantum Cosmology · Physics 2013-01-10 Roman Gold , Sebastiano Bernuzzi , Marcus Thierfelder , Bernd Bruegmann , Frans Pretorius

During the final moments of a binary black hole (BH) merger, the gravitational wave (GW) luminosity of the system is greater than the combined electromagnetic output of the entire observable universe. However, the extremely weak coupling…

High Energy Astrophysical Phenomena · Physics 2015-05-20 Jeremy D. Schnittman

The merger of binary neutron-stars systems combines in a single process: extreme gravity, copious emission of gravitational waves, complex microphysics, and electromagnetic processes that can lead to astrophysical signatures observable at…

General Relativity and Quantum Cosmology · Physics 2018-02-21 Luca Baiotti , Luciano Rezzolla

Mergers of binary neutron stars and black hole-neutron star binaries are one of the most promising sources for the ground-based gravitational-wave (GW) detectors and also a high-energy astrophysical phenomenon as illustrated by the…

High Energy Astrophysical Phenomena · Physics 2019-08-08 Masaru Shibata , Kenta Hotokezaka

The question "what is the observable electromagnetic (EM) signature of a compact binary merger?" is an intriguing one with crucial consequences to the quest for gravitational waves (GW). Compact binary mergers are prime sources of GW,…

High Energy Astrophysical Phenomena · Physics 2015-03-18 Ehud Nakar , Tsvi Piran

We describe the first observations of the same celestial object with gravitational waves and light. * GW170817 was the first detection of a neutron star merger with gravitational waves. * The detection of a spatially coincident weak burst…

High Energy Astrophysical Phenomena · Physics 2021-12-01 Raffaella Margutti , Ryan Chornock

In addition to producing loud gravitational waves (GW), the dynamics of a binary black hole system could induce emission of electromagnetic (EM) radiation by affecting the behavior of plasmas and electromagnetic fields in their vicinity. We…

General Relativity and Quantum Cosmology · Physics 2010-04-21 Carlos Palenzuela , Luis Lehner , Shin Yoshida

Understanding the properties of strongly interacting matter at extreme densities is a central problem in fundamental physics, but neutron star mergers provide a natural laboratory for probing this regime. However, the complexity of the…

High Energy Astrophysical Phenomena · Physics 2026-02-24 Nina Kunert , Guilherme Grams , William Newton , Edoardo Giangrandi , Anna Puecher , Hauke Koehn , Violetta Sagun , Tim Dietrich

In light of the recent dazzling discovery of GW170817, we discuss several new scientific opportunities that would emerge in multi-messenger time-domain astrophysics if a facility like the next generation Very Large Array (ngVLA) were to…

Instrumentation and Methods for Astrophysics · Physics 2018-10-18 Alessandra Corsi , Dale A. Frail , Davide Lazzati , Dario Carbone , Eric J. Murphy , Benjamin J. Owen , David J. Sand , Richard O'Shaughnessy

How many gravitational-wave observations from double compact object mergers have we seen to date? This seemingly simple question surprisingly yields a somewhat ambiguous answer that depends on the chosen data-analysis pipeline, detection…

High Energy Astrophysical Phenomena · Physics 2024-04-25 Floor S. Broekgaarden , Sharan Banagiri , Ethan Payne

We discuss gravitational waves from merging binaries using a Newtonian approach with some inputs from the Post-Newtonian formalism. We show that it is possible to understand the key features of the signal using fundamental physics and also…

Popular Physics · Physics 2019-12-20 Jahanvi , Ashish Kumar Meena , J. S. Bagla