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The discovery of a kilonova associated with the GW170817 binary neutron star merger had far-reaching implications for our understanding of several open questions in physics and astrophysics. Unfortunately, since then, only one robust binary…

High Energy Astrophysical Phenomena · Physics 2025-04-14 Ido Keinan , Iair Arcavi

Recent discoveries of long gamma-ray bursts accompanied by kilonova emission prompted interest in understanding their progenitors. If these long-duration bursts arise from neutron star mergers, similar to short gamma-ray bursts, it raises…

High Energy Astrophysical Phenomena · Physics 2025-06-24 Hsin-Yu Chen , Ore Gottlieb

Fast material ejected dynamically over $<10$ ms during the merger of a binary neutron-star (BNS) system can give rise to distinctive electromagnetic counterparts to the system's gravitational-wave emission that can serve as a "smoking gun"…

High Energy Astrophysical Phenomena · Physics 2023-03-23 Luciano Combi , Daniel M. Siegel

Multimessenger observations of the neutron star merger GW170817 and its kilonova proved that neutron star mergers can synthesize large quantities of r-process elements. If neutron star mergers in fact dominate all r-process element…

High Energy Astrophysical Phenomena · Physics 2019-09-11 Alexander P. Ji , Maria R. Drout , Terese T. Hansen

GW170817 showed that neutron star mergers not only emit gravitational waves but also can release electromagnetic signatures in multiple wavelengths. Within the first half of the third observing run of the Advanced LIGO and Virgo detectors,…

GRB 211211A is a rare burst with a genuinely long duration, yet its prominent kilonova association provides compelling evidence that this peculiar burst was the result of a compact binary merger. However, the exact nature of the merging…

High Energy Astrophysical Phenomena · Physics 2023-09-01 Yi-Han Iris Yin , Bin-Bin Zhang , Hui Sun , Jun Yang , Yacheng Kang , Lijing Shao , Yu-Han Yang , Bing Zhang

We reassess the capacity for multimessenger inference of AT2017gfo/GW170817 using both kilonova and gravitational wave emission within the context of a recent simulation-based surrogate model for kilonova emission. Independent of the…

In the new era of gravitational wave (GW) and multi-messenger astrophysics, the detection of a GW signal from the coalescence of a black hole - neutron star (BHNS) binary remains a highly anticipated discovery. This kind of system is…

High Energy Astrophysical Phenomena · Physics 2019-06-05 C. Barbieri , O. S. Salafia , A. Perego , M. Colpi , G. Ghirlanda

Following the historical observations of GW170817 and its multi-wavelength afterglow, more radio afterglows from neutron star mergers are expected in the future as counterparts to gravitational wave inspiral signals. We wish to describe…

High Energy Astrophysical Phenomena · Physics 2019-10-23 Raphaël Duque , Frédéric Daigne , Robert Mochkovitch

Short gamma-ray bursts result from mergers of two neutron stars or from collapsars, but probably at a smaller rate. In the first case, a kilonova occurs while in the second case a Type Ic supernova is expected. } {Even if future…

High Energy Astrophysical Phenomena · Physics 2019-01-29 Nidhal Guessoum , Hannachi Zitouni , Robert Mochkovitch

AAssociation of GW170817/GRB170817A/AT2017gfo provides the first direct evidence for neutron star mergers as significant sources of $r$-process nucleosynthesis. A gamma-ray transient (GRT) would be powered by the radioactive decay of the…

High Energy Astrophysical Phenomena · Physics 2022-06-22 Meng-Hua Chen , Rui-Chong Hu , En-Wei Liang

Revealing the temporal evolution of individual heavy elements synthesized in the merger ejecta from binary neutron star mergers not only improves our understanding of the origin of heavy elements beyond iron but also clarifies the energy…

High Energy Astrophysical Phenomena · Physics 2023-11-15 Meng-Hua Chen , En-Wei Liang

LSST's wide-field of view and sensitivity will revolutionize studies of the transient sky by finding extraordinary numbers of new transients every night. The recent discovery of a kilonova counterpart to LIGO/Virgo's first detection of…

High Energy Astrophysical Phenomena · Physics 2019-02-15 Graham P. Smith , Andrew Robertson , Matteo Bianconi , Mathilde Jauzac

The merger of neutron star binaries is believed to eject a wide range of heavy elements into the universe. By observing the emission from this ejecta, scientists can probe the ejecta properties (mass, velocity and composition…

The discovery of the optical/infra-red counterpart (AT2017gfo) to the binary neutron star gravitational-wave detection (GW170817), which was followed by a short gamma-ray burst (GRB170817), marked a groundbreaking moment in multi-messenger…

We present a comprehensive analysis of 653 optical candidate counterparts reported during the third gravitational wave (GW) observing run. Our sample concentrates on candidates from the 15 events (published in GWTC-2, GWTC-3 or not…

High Energy Astrophysical Phenomena · Physics 2022-03-14 J. Rastinejad , K. Paterson , W. Fong , D. J. Sand , M. J. Lundquist , G. Hosseinzadeh , E. Christensen , P. N. Daly , A. R. Gibbs , S. Hall , F. Shelly , S. Yang

GW190425 was the second gravitational wave (GW) signal compatible with a binary neutron star (BNS) merger detected by the Advanced LIGO and Advanced Virgo detectors. Since no electromagnetic counterpart was identified, whether the…

High Energy Astrophysical Phenomena · Physics 2024-01-25 A. Camilletti , L. Chiesa , G. Ricigliano , A. Perego , L. C. Lippold , S. Padamata , S. Bernuzzi , D. Radice , D. Logoteta , F. M. Guercilena

The Einstein Telescope (ET), a proposed next-generation gravitational wave (GW) observatory, will expand the reach of GW astronomy of stellar-mass compact object binaries to unprecedented distances, enhancing opportunities for…

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

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
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