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Following the coalescence of binary neutron stars, debris from the merger which remains marginally bound to the central compact remnant will fallback at late times, feeding a sustained accretion flow. Unbound winds or a wide-angle jet from…

High Energy Astrophysical Phenomena · Physics 2020-04-29 Valentin Decoene , Claire Guépin , Ke Fang , Kumiko Kotera , Brian David Metzger

The state of supranuclear matter in compact stars remains puzzling, and it is argued that pulsars could be strangeon stars. The consequences of merging double strangeon stars are worth exploring, especially in the new era of multi-messenger…

High Energy Astrophysical Phenomena · Physics 2021-12-08 X. Y. Lai , C. J. Xia , Y. W. Yu , R. X. Xu

A kilonova is a short-lived explosive event in the universe, resulting from the merger of two compact objects. Despite its importance as a primary source of heavy elements through r-process nucleosynthesis, its nature is not well…

High Energy Astrophysical Phenomena · Physics 2023-11-22 Donggeun Tak , Z. Lucas Uhm , James H. Gillanders

Kilonovae (KNe) are one of the fastest types of optical transients known, cooling rapidly in the first few days following their neutron-star merger origin. We show here that KN spectral features go through rapid recombination transitions,…

High Energy Astrophysical Phenomena · Physics 2024-08-14 Albert Sneppen , Darach Watson , James H. Gillanders , Kasper E. Heintz

We discuss how we can detect and identify counterparts of fast radio bursts (FRBs) in future optical follow up observations of FRBs if real-time alert of FRBs becomes available. We consider kilonovae as candidates of FRB optical…

High Energy Astrophysical Phenomena · Physics 2015-06-22 Yuu Niino , Tomonori Totani , Jun E. Okumura

Very recently, the gravitational-wave (GW) event GW170817 was discovered to be associated with the short gamma-ray burst (GRB) 170817A. Multi-wavelength follow-up observations were carried out, and X-ray, optical, and radio counterparts to…

High Energy Astrophysical Phenomena · Physics 2017-12-13 Di Xiao , Liang-Duan Liu , Zi-Gao Dai , Xue-Feng Wu

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

The electromagnetic transients accompanying compact binary mergers ($\gamma$-ray bursts, afterglows and 'macronovae') are crucial to pinpoint the sky location of gravitational wave sources. Macronovae are caused by the radioactivity from…

Multimessenger observations of the binary neutron star merger GW170817 have enabled the discovery of a diverse array of electromagnetic counterparts to compact binary mergers, including an unambiguous kilonova, a short gamma-ray burst, and…

With the increasing sensitivity of advanced gravitational wave detectors, the first joint detection of an electromagnetic and gravitational wave signal from a compact binary merger will hopefully happen within this decade. However, current…

High Energy Astrophysical Phenomena · Physics 2017-11-01 Michael Coughlin , Tim Dietrich , Kyohei Kawaguchi , Stephen Smartt , Christopher Stubbs , Maximiliano Ujevic

The nearby long-duration GRB 191019A recently detected by Swift lacks an associated supernova and belongs to a host galaxy with little star formation activity, suggesting that the origin of this burst is the result of a merger of two…

High Energy Astrophysical Phenomena · Physics 2024-02-21 Suo-Ning Wang , Hou-Jun Lü , Yong Yuan , Hao-Yu Yuan , Jared Rice , Meng-Hua Chen , En-Wei Liang

The final inspiral of double neutron star and neutron star-black hole binaries are likely to be detected by advanced networks of ground-based gravitational wave (GW) interferometers. Maximizing the science returns from such a discovery will…

High Energy Astrophysical Phenomena · Physics 2015-05-30 Brian D. Metzger , Edo Berger

The detection of a kilo/macronova electromagnetic counterpart (AT2017gfo) of the first gravitational wave signal compatible with the merger of two neutron stars (GW170817) has confirmed the occurrence of r-process nucleosynthesis in this…

High Energy Astrophysical Phenomena · Physics 2017-12-13 Albino Perego , David Radice , Sebastiano Bernuzzi

High-frequency gravitational-wave (GW) radiation has been detected by LIGO-Virgo-KAGRA in the merger of compact stars. However, two GW events, GW190814 and GW200210, the mass of one companion object falls into the mass region of…

High Energy Astrophysical Phenomena · Physics 2025-04-11 ZhaoWei Du , HouJun Lü , Xiaoxuan Liu , XiLong Fan , EnWei Liang

Black hole-neutron star (BHNS) binaries are amongst promising candidates for the joint detection of electromagnetic (EM) signals with gravitational waves (GWs) and are expected to be detected in the near future. Here we study the effect of…

High Energy Astrophysical Phenomena · Physics 2021-12-22 Mukul Bhattacharya , Pawan Kumar , George Smoot

We analyse the tidal disruption probability of potential neutron star--black hole (NSBH) merger gravitational wave (GW) events, including GW190426_152155, GW190814, GW200105_162426 and GW200115_042309, detected during the third observing…

High Energy Astrophysical Phenomena · Physics 2021-11-12 Jin-Ping Zhu , Shichao Wu , Yuan-Pei Yang , Bing Zhang , Yun-Wei Yu , He Gao , Zhoujian Cao , Liang-Duan Liu

We investigate the dynamics and electromagnetic (EM) signatures of neutron star-neutron star (NS-NS) or neutron star-black hole (NS-BH) merger ejecta that occurs in the accretion disk of an active galactic nucleus (AGN). We find that the…

High Energy Astrophysical Phenomena · Physics 2022-12-07 Jia Ren , Ken Chen , Yun Wang , Zi-Gao Dai

Short-hard gamma-ray bursts (GRBs) are widely believed to be produced by the merger of two binary compact objects, specifically by two neutron stars or by a neutron star orbiting a black hole. According to the Li-Paczynski kilonova model,…

High Energy Astrophysical Phenomena · Physics 2013-10-14 Zhi-Ping Jin , Dong Xu , Yi-Zhong Fan , Xue-Feng Wu , Da-Ming Wei

The observation of a kilonova AT2017gfo associated with the gravitational wave event GW170817 provides the first strong evidence that neutron star mergers are dominant contributors to the production of heavy $r$-process elements.…

High Energy Astrophysical Phenomena · Physics 2024-07-23 Meng-Hua Chen , Li-Xin Li , En-Wei Liang

Neutron star binary mergers are strong sources of gravitational waves (GWs). Promising electromagnetic counterparts are short gamma-ray bursts (GRBs) but the emission is highly collimated. We propose that the scattering of the long-lasting…

High Energy Astrophysical Phenomena · Physics 2015-08-19 Shota Kisaka , Kunihito Ioka , Takashi Nakamura
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