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We estimate the long-lasting gravitational wave (GW) emission of compact dark objects following a binary neutron-star (NS) merger. We consider compact dark objects, which initially reside in the centers of NSs and which may consist of…

High Energy Astrophysical Phenomena · Physics 2023-10-13 Andreas Bauswein , Gang Guo , Jr-Hua Lien , Yen-Hsun Lin , Meng-Ru Wu

Performing N-body simulations, we examine the dynamics of BH-BH (10 Msun each) and NS-NS (1.4 Msun each) binaries formed in a cluster and its implications for gravitational wave detection. A significant fraction of compact binaries are…

High Energy Astrophysical Phenomena · Physics 2015-06-16 Yeong-Bok Bae , Chunglee Kim , Hyung Mok Lee

We review current understanding of kilonova/macronova emission from compact binary mergers (mergers of two neutron stars or a neutron star and a black hole). Kilonova/macronova is optical and near-infrared emission powered by radioactive…

High Energy Astrophysical Phenomena · Physics 2016-07-27 Masaomi Tanaka

Binary neutron star mergers are expected to produce fast dynamical ejecta, with mildly relativistic velocities extending to $\beta=v/c>0.6$. In a preceding paper, we derived an analytic description of the time-dependent radio to X-ray…

High Energy Astrophysical Phenomena · Physics 2024-05-27 Gilad Sadeh , Noya Linder , Eli Waxman

Multi-messenger astronomy was galvanized by the detection of gravitational waves (GWs) from the binary neutron star (BNS) merger GW170817 and electromagnetic (EM) emission from the subsequent kilonova and short gamma ray burst. Maximizing…

High Energy Astrophysical Phenomena · Physics 2025-12-02 Nathan Steinle , Samar Safi-Harb , Matt Nicholl , Isabelle Worssam , Benjamin P. Gompertz

The rich phenomenology of binary neutron star mergers offers a unique opportunity to test general relativity, investigate matter at supranuclear densities, and learn more about the origin of heavy elements. As multi-messenger sources, they…

High-mass gravitational-wave events in the neutron-star mass range, such as GW190425, have recently started to be detected by the LIGO/Virgo detectors. If the masses of the two binary components fall in the neutron-star mass range, such a…

High Energy Astrophysical Phenomena · Physics 2021-05-12 Elias R. Most , L. Jens Papenfort , Samuel Tootle , Luciano Rezzolla

While there are a number of proposed formation channels for subsolar mass compact objects, including black holes formed primordially, or neutron stars that form in collapsar disks, there have yet to be any conclusive observations of such…

High Energy Astrophysical Phenomena · Physics 2026-03-27 Maxence Corman , William E. East , Jocelyn S. Read

Compact binary mergers are sources of gravitational waves, and can be accompanied by electromagnetic signals. We discuss the possible features in the kilonova emissions which may help distinguish the black hole - neutron star mergers from…

High Energy Astrophysical Phenomena · Physics 2024-03-25 Agnieszka Janiuk , Joseph Saji , Gerardo Urrutia

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

Following merger, a neutron star (NS) binary can produce roughly one of three different outcomes: (1) a stable NS, (2) a black hole (BH), or (3) a supra-massive, rotationally-supported NS, which then collapses to a BH following angular…

High Energy Astrophysical Phenomena · Physics 2017-08-02 Anthony L. Piro , Bruno Giacomazzo , Rosalba Perna

The LIGO-Virgo gravitational wave detectors have confidently observed 4 events involving neutron stars: two binary neutron star (BNS) mergers (GW170817 and GW190425), and two neutron star-black hole mergers (GW200105 and GW200115). However,…

High Energy Astrophysical Phenomena · Physics 2023-08-10 Sumeet Kulkarni , Surendra Padamata , Anuradha Gupta

The study of massive binary systems has steadily progressed over the past decades, with increasing focus on their evolution, interactions and mergers, driven by improvements in computational modelling and observational techniques. In…

High Energy Astrophysical Phenomena · Physics 2025-02-05 Aldana Grichener

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

Neutron star mergers are among the most promising sources of gravitational waves for advanced ground-based detectors. These mergers are also expected to power bright electromagnetic signals, in the form of short gamma-ray bursts,…

The detection of gravitational waves emitted during a neutron star - black hole merger and the associated electromagnetic counterpart will provide a wealth of information about stellar evolution nuclear matter, and General Relativity. While…

Astrophysics of Galaxies · Physics 2020-06-16 Manuel Arca Sedda

Using state-of-the-art dynamical simulations of globular clusters, including radiation reaction during black hole encounters and a cosmological model of star cluster formation, we create a realistic population of dynamically-formed binary…

High Energy Astrophysical Phenomena · Physics 2018-12-26 Carl L. Rodriguez , Pau Amaro-Seoane , Sourav Chatterjee , Kyle Kremer , Frederic A. Rasio , Johan Samsing , Claire S. Ye , Michael Zevin

We present fully general-relativistic simulations of binary neutron star mergers with a temperature and composition dependent nuclear equation of state. We study the dynamical mass ejection from both quasi-circular and dynamical-capture…

High Energy Astrophysical Phenomena · Physics 2016-06-21 David Radice , Filippo Galeazzi , Jonas Lippuner , Luke F. Roberts , Christian D. Ott , Luciano Rezzolla

Neutron star-black hole binaries are among the strongest sources of gravitational waves detectable by current observatories. They can also power bright electromagnetic signals (gamma-ray bursts, kilonovae), and may be a significant source…

As the technology of gravitational-wave and neutrino detectors becomes increasingly mature, a multi-messenger era of astronomy is ushered in. Advanced gravitational wave detectors are close to making a ground-breaking discovery of…

High Energy Astrophysical Phenomena · Physics 2015-06-16 He Gao , Bing Zhang , Xue-Feng Wu , Zi-Gao Dai