Observation of Gravitational Waves from the Coalescence of a $2.5\text{-}4.5~M_\odot$ Compact Object and a Neutron Star
Creators: name: The LIGO Scientific Collaboration
name: The Virgo Collaboration
name: The KAGRA Collaboration
name: Abac, A. G.
name: Abbott, R.
name: Abouelfettouh, I.
name: Acernese, F.
name: Ackley, K.
name: Adhicary, S.
name: Adhikari, N.
name: Adhikari, R. X.
name: Adkins, V. K.
name: Agarwal, D.
name: Agathos, M.
name: Abchouyeh, M. Aghaei
name: Aguiar, O. D.
name: Aguilar, I.
name: Aiello, L.
name: Ain, A.
name: Ajith, P.
name: Akçay, S.
name: Akutsu, T.
name: Albanesi, S.
name: Alfaidi, R. A.
name: Al-Jodah, A.
name: Alléné, C.
name: Allocca, A.
name: Al-Shammari, S.
name: Altin, P. A.
name: Alvarez-Lopez, S.
name: Amato, A.
name: Amez-Droz, L.
name: Amorosi, A.
name: Amra, C.
name: Ananyeva, A.
name: Anderson, S. B.
name: Anderson, W. G.
name: Andia, M.
name: Ando, M.
name: Andrade, T.
name: Andres, N.
name: Andrés-Carcasona, M.
name: Andrić, T.
name: Anglin, J.
name: Ansoldi, S.
name: Antelis, J. M.
name: Antier, S.
name: Aoumi, M.
name: Appavuravther, E. Z.
name: Appert, S.
name: Apple, S. K.
name: Arai, K.
name: Araya, A.
name: Araya, M. C.
name: Areeda, J. S.
name: Argianas, L.
name: Aritomi, N.
name: Armato, F.
name: Arnaud, N.
name: Arogeti, M.
name: Aronson, S. M.
name: Arun, K. G.
name: Ashton, G.
name: Aso, Y.
name: Assiduo, M.
name: Melo, S. Assis de Souza
name: Aston, S. M.
name: Astone, P.
name: Attadio, F.
name: Aubin, F.
name: AultONeal, K.
name: Avallone, G.
name: Azrad, D.
name: Babak, S.
name: Badaracco, F.
name: Badger, C.
name: Bae, S.
name: Bagnasco, S.
name: Bagui, E.
name: Baier, J. G.
name: Baiotti, L.
name: Bajpai, R.
name: Baka, T.
name: Ball, M.
name: Ballardin, G.
name: Ballmer, S. W.
name: Banagiri, S.
name: Banerjee, B.
name: Bankar, D.
name: Baral, P.
name: Barayoga, J. C.
name: Barish, B. C.
name: Barker, D.
name: Barneo, P.
name: Barone, F.
name: Barr, B.
name: Barsotti, L.
name: Barsuglia, M.
name: Barta, D.
name: Bartoletti, A. M.
name: Barton, M. A.
name: Bartos, I.
name: Basak, S.
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Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report the observation of a coalescing compact binary with component masses $2.5\text{-}4.5~M_\odot$ and $1.2\text{-}2.0~M_\odot$ (all measurements quoted at the 90% credible level). The gravitational-wave signal GW230529_181500 was observed during the fourth observing run of the LIGO-Virgo-KAGRA detector network on 2023 May 29 by the LIGO Livingston Observatory. The primary component of the source has a mass less than $5~M_\odot$ at 99% credibility. We cannot definitively determine from gravitational-wave data alone whether either component of the source is a neutron star or a black hole. However, given existing estimates of the maximum neutron star mass, we find the most probable interpretation of the source to be the coalescence of a neutron star with a black hole that has a mass between the most massive neutron stars and the least massive black holes observed in the Galaxy. We provisionally estimate a merger rate density of $55^{+127}_{-47}~\text{Gpc}^{-3}\,\text{yr}^{-1}$ for compact binary coalescences with properties similar to the source of GW230529_181500; assuming that the source is a neutron star-black hole merger, GW230529_181500-like sources constitute about 60% of the total merger rate inferred for neutron star-black hole coalescences. The discovery of this system implies an increase in the expected rate of neutron star-black hole mergers with electromagnetic counterparts and provides further evidence for compact objects existing within the purported lower mass gap.
description: 45 pages (10 pages author list, 13 pages main text, 1 page acknowledgements, 13 pages appendices, 8 pages bibliography), 17 figures, 16 tables. Update to match version published in The Astrophysical Journal Letters. Data products available from https://zenodo.org/records/10845779