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The detection of a secular post-merger gravitational wave (GW) signal in a binary neutron star (BNS) merger serves as strong evidence for the formation of a long-lived post-merger neutron star (NS), which can help constrain the maximum mass…

General Relativity and Quantum Cosmology · Physics 2023-11-17 Yikang Chen , Bin Liu , Shunke Ai , Lin Lan , He Gao , Yong Yuan , Zong-Hong Zhu

The remnant star of a neutron star merger is an anticipated loud source of kiloHertz gravitational waves that conveys unique information on the equation of state of hot matter at extreme densities. Observations of such signals are hampered…

General Relativity and Quantum Cosmology · Physics 2020-01-22 Matteo Breschi , Sebastiano Bernuzzi , Francesco Zappa , Michalis Agathos , Albino Perego , David Radice , Alessandro Nagar

Mergers of double neutron stars (DNSs) could lead to the formation of a long-lived massive remnant NS, which has been previously suggested to explain the AT 2017gfo kilonova emission in the famous GW170817 event. For an NS-affected…

High Energy Astrophysical Phenomena · Physics 2021-10-27 Guang-Lei Wu , Yun-Wei Yu , Jin-Ping Zhu

We present a search for gravitational waves from merging binary neutron stars which have non-negligible eccentricity as they enter the LIGO observing band. We use the public Advanced LIGO data which covers the period from 2015 through 2017…

High Energy Astrophysical Phenomena · Physics 2020-03-24 Alexander H. Nitz , Amber Lenon , Duncan A. Brown

We present a rapid analytic framework for predicting kilonova light curves following neutron star (NS) mergers, where the main input parameters are binary-based properties measurable by gravitational wave detectors (chirp mass and mass…

High Energy Astrophysical Phenomena · Physics 2021-07-07 Matt Nicholl , Ben Margalit , Patricia Schmidt , Graham P. Smith , Evan J. Ridley , James Nuttall

Gravitational wave astronomy has established its role in measuring the equation of state governing cold supranuclear matter. To date and in the near future, gravitational wave measurements from neutron star binaries are likely to be…

General Relativity and Quantum Cosmology · Physics 2019-09-04 Ka Wa Tsang , Tim Dietrich , Chris Van Den Broeck

On the 29th of May 2023, the LIGO-Virgo-KAGRA Collaboration observed a compact binary coalescence event consistent with a neutron star-black hole merger, though the heavier object of mass 2.5-4.5 $M_\odot$ would fall into the purported…

The detection of the events GW150914 and GW151226, both consistent with the merger of a binary black hole system (BBH), opened the era of gravitational wave (GW) astronomy. Besides BBHs, the most promising GW sources are the coalescences of…

High Energy Astrophysical Phenomena · Physics 2016-12-07 Barbara Patricelli , Massimiliano Razzano , Giancarlo Cella , Francesco Fidecaro , Elena Pian , Marica Branchesi , Antonio Stamerra

The detection of the GW170817 neutron star merger event has incited an intense research activity towards the understanding of the nuclear matter equation of state. In this paper we compare in particular the pressure-density relation…

Nuclear Theory · Physics 2019-07-09 G. F. Burgio , A. Figura , H. -J. Schulze , J. -B. Wei

We present new (3+1)D numerical relativity simulations of the binary neutron star (BNS) merger and postmerger phase. We focus on a previously inaccessible region of the binary parameter space spanning the binary's mass-ratio…

General Relativity and Quantum Cosmology · Physics 2017-02-01 Tim Dietrich , Maximiliano Ujevic , Wolfgang Tichy , Sebastiano Bernuzzi , Bernd Bruegmann

Explaining gravitational-wave (GW) observations of binary neutron star (BNS) mergers requires an understanding of matter beyond nuclear saturation density. Our current knowledge of the properties of high-density matter relies on…

High Energy Astrophysical Phenomena · Physics 2024-03-15 Giuseppe Rivieccio , Davide Guerra , Milton Ruiz , José A. Font

The merger of two neutron stars is predicted to give rise to three major detectable phenomena: a short burst of gamma-rays, a gravitational wave signal, and a transient optical/near-infrared source powered by the synthesis of large amounts…

The historical detection of gravitational waves from the binary neutron star merger GW170817 is providing fundamental new insights into the astrophysical site for the creation of the heaviest elements in the cosmos and on the equation of…

Nuclear Theory · Physics 2024-03-26 J. Piekarewicz

The first detection of gravitational waves from the binary neutron star merger event GW170817 has started to provide important new constraints on the nuclear equation of state at high density. The tidal deformability bound of GW170817…

High Energy Astrophysical Phenomena · Physics 2019-05-29 Rana Nandi , Prasanta Char , Subrata Pal

It seems that the wealth of information revealed by the multi-messenger observations of the binary neutron star (NS) merger event, GW170817/GRB 170817A/kilonova AT2017gfo, places irreconcilable constraints to models of the prompt emission…

High Energy Astrophysical Phenomena · Physics 2023-08-16 Shuang Du , Tingting Lin , Shujin Hou , Renxin Xu

The recent LIGO observation of gravitational waves from a binary black hole merger triggered several follow-up searches from both electromagnetic wave as well as neutrino observatories. Since in general, it is expected that all matter has…

High Energy Astrophysical Phenomena · Physics 2017-10-25 Krijn D. de Vries , Gwenhaël de Wasseige , Jean-Marie Frère , Matthias Vereecken

The gravitational waves from the first binary neutron star merger, GW170817, were accompanied by a multi-wavelength electromagnetic counterpart, from $\gamma$-rays to radio. The accompanying gamma-rays, seems at first to confirm the…

High Energy Astrophysical Phenomena · Physics 2018-10-31 Ehud Nakar , Ore Gottlieb , Tsvi Piran , Mansi M. Kasliwal , Greg Hallinan

The historic observations of the neutron star merger GW170817 advanced our understanding of r-process nucleosynthesis and the equation of state (EOS) of neutron rich matter. Simple neutrino physics suggests that supernovae are not the site…

High Energy Astrophysical Phenomena · Physics 2019-11-04 C. J. Horowitz

This paper provides an overview of the current state of the stripping model for short gamma-ray bursts. After the historical joint detection of the gravitational wave event GW170817 and the accompanying gamma-ray burst GRB170817A, the…

High Energy Astrophysical Phenomena · Physics 2021-05-18 S. Blinnikov , D. Nadyozhin , N. Kramarev , A. Yudin

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