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Recent gravitational wave observations include possible detections of black hole - neutron star binary mergers. As with binary black hole mergers, numerical simulations help characterize the sources. For binary systems with neutron star…

General Relativity and Quantum Cosmology · Physics 2024-04-16 Bing-Jyun Tsao , Bhavesh Khamesra , Miguel Gracia-Linares , Pablo Laguna

There are important but unresolved processes in the standard formation scenarios of double compact star binaries (DCBs; BH-BH, BH-NS, NS-NS systems), such as mass transfer and the common envelope (CE) phase. We analyze the effects of…

High Energy Astrophysical Phenomena · Physics 2018-10-29 Iminhaji Ablimit , Keiichi Maeda

Aims. The mass discrepancy between the observed population of double neutron star binaries by radio pulsar observations and gravitational-wave observation requires an explanation. Methods. Binary population synthesis calculations are…

Solar and Stellar Astrophysics · Physics 2020-07-22 Matthias U. Kruckow

We study the merger of black hole (BH)-neutron star (NS) binaries with a variety of BH spins aligned or anti-aligned with the orbital angular momentum, and with the mass ratio in the range MBH/MNS = 2--5, where MBH and MNS are the mass of…

High Energy Astrophysical Phenomena · Physics 2017-12-27 Koutarou Kyutoku , Hirotada Okawa , Masaru Shibata , Keisuke Taniguchi

The recent advanced LIGO detections of gravitational waves from merging binary black holes enhance the prospect of exploring binary evolution via gravitational-wave observations of a population of compact-object binaries. In the face of…

High Energy Astrophysical Phenomena · Physics 2017-01-25 Ilya Mandel , Will M. Farr , Andrea Colonna , Simon Stevenson , Peter Tiňo , John Veitch

Mergers of black hole (BH) and neutron star (NS) binaries are expected to be observed by gravitational wave observatories in the coming years. Until now, LIGO has only set an upper limit on this merger rate. BH-NS binaries are expected to…

Astrophysics of Galaxies · Physics 2019-05-08 Giacomo Fragione , Abraham Loeb

Neutron star $-$ black hole (NSBH) merger events bring us new opportunities to constrain theories of stellar and binary evolution, and understand the nature of compact objects. In this work, we investigate the formation of merging NSBH…

In this paper, we investigate the properties of binary neutron stars (BNSs) and their mergers by combining population synthesis models for binary stellar evolution (BSE) with cosmological galaxy formation and evolution models. We obtain…

Astrophysics of Galaxies · Physics 2021-10-20 Qingbo Chu , Shenghua Yu , Youjun Lu

We review the current status of attempts to numerically model the merger of neutron star-neutron star (NSNS) and black hole-neutron star (BHNS) binary systems, and we describe the understanding of such events that is emerging from these…

High Energy Astrophysical Phenomena · Physics 2014-11-20 Matthew D. Duez

The development of advanced gravitational wave (GW) observatories, such as Advanced LIGO and Advanced Virgo, provides impetus to refine theoretical predictions for what these instruments might detect. In particular, with the range…

The first detection of gravitational waves from a neutron star - neutron star (NS-NS) merger, GW170817, and the increasing number of observations of short gamma-ray bursts (SGRBs) have greatly motivated studies of the origins of NS-NS and…

High Energy Astrophysical Phenomena · Physics 2020-01-15 Claire S. Ye , Wen-fai Fong , Kyle Kremer , Carl L. Rodriguez , Sourav Chatterjee , Giacomo Fragione , Frederic A. Rasio

Six gravitational wave events have been reported by the LIGO-Virgo collaboration (LVC), five of them associated with black hole binary (BHB) mergers and one with a double neutron star (DNS) merger, while the coalescence of a black…

High Energy Astrophysical Phenomena · Physics 2019-05-22 Nicola Giacobbo , Michela Mapelli

We study the Galactic field population of double compact objects (NS-NS, BH-NS, BH-BH binaries) to investigate the number (if any) of these systems that can potentially be detected with LISA at low gravitational-wave frequencies. We…

Astrophysics · Physics 2010-11-23 Krzysztof Belczynski , Matthew Benacquista , Tomasz Bulik

Following the collapse of their cores, some of the massive binary stars that populate our Universe are expected to form merging binaries composed of black holes and neutron stars. Gravitational-wave observations of the resulting compact…

High Energy Astrophysical Phenomena · Physics 2021-12-15 Maciej Dabrowny , Nicola Giacobbo , Davide Gerosa

Optical observations of normal-stars in binary systems with massive unseen objects have been proposed to search for candidate black holes (BHs) and provide a direct measurement of their dynamical masses. In this paper, we have performed…

Solar and Stellar Astrophysics · Physics 2019-12-04 Yong Shao , Xiang-Dong Li

Compact objects observed via gravitational waves are classified as black holes or neutron stars primarily based on their inferred mass with respect to stellar evolution expectations. However, astrophysical expectations for the lowest mass…

High Energy Astrophysical Phenomena · Physics 2025-10-29 Jacob Golomb , Isaac Legred , Katerina Chatziioannou , Adrian Abac , Tim Dietrich

Self-lensing (SL) in binary systems has the potential to provide a unique observational window into the Galactic population of compact objects. Using the $\mathtt{startrack}$ and COSMIC population synthesis codes, we investigate how…

High Energy Astrophysical Phenomena · Physics 2026-02-18 Grzegorz Wiktorowicz , Matthew Middleton , Aleksandra Olejak , Cordelia Dashwood-Brown , Madeleine-Mai Ward , Adam Ingram

Short gamma-ray bursts (SGRBs) are now known to be the product of the merger of two compact objects. However, two possible formation channels exist: neutron star -- neutron star (NS -- NS) or NS -- black hole (BH). The landmark SGRB 170817A…

High Energy Astrophysical Phenomena · Physics 2020-06-03 B. P. Gompertz , A. J. Levan , N. R. Tanvir

We compute and present the distribution in mass of single and binary neutron stars, strange stars, and black holes. The calculations were performed using a stellar population synthesis code. We follow all phases of single and binary…

Astrophysics · Physics 2009-10-31 Krzysztof Belczynski , Tomasz Bulik , Wlodzimierz Kluzniak

Gravitational-wave detections are enabling measurements of the rate of coalescences of binaries composed of two compact objects -- neutron stars and/or black holes. The coalescence rate of binaries containing neutron stars is further…

High Energy Astrophysical Phenomena · Physics 2022-08-29 Ilya Mandel , Floor S. Broekgaarden