LIGO Scientific Collaboration, Alexandre Sevrin, Virgo Collaboration, Alba Romero-RodrÃguez, KAGRA Collaboration, Hannah Duval, Kevin Turbang, Alba Romero-RodrÃguez, Hannah Duval, Alexandre Sevrin, Kevin Turbang
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.
LIGO Scientific Collaboration, Virgo Collaboration, KAGRA Collaboration, Duval, H, Romero-RodrÃguez, A, Sevrin, A & Turbang, K 2024, 'Observation of Gravitational Waves from the Coalescence of a $2.5\text{-}4.5~M_\odot$ Compact Object and a Neutron Star', The Astrophysical Journal Letters , vol. 970, no. 2, L34. https://doi.org/10.3847/2041-8213/ad5beb
LIGO Scientific Collaboration, Virgo Collaboration, KAGRA Collaboration, Duval, H., Romero-RodrÃguez, A., Sevrin, A., & Turbang, K. (2024). Observation of Gravitational Waves from the Coalescence of a $2.5\text{-}4.5~M_\odot$ Compact Object and a Neutron Star. The Astrophysical Journal Letters , 970(2), Article L34. https://doi.org/10.3847/2041-8213/ad5beb
@article{a61752efc9ed474aa21027e95bef0394,
title = "Observation of Gravitational Waves from the Coalescence of a $2.5\text{-}4.5~M_\odot$ Compact Object and a Neutron Star",
abstract = " 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. ",
keywords = "astro-ph.HE, gr-qc",
author = "{LIGO Scientific Collaboration} and {Virgo Collaboration} and {KAGRA Collaboration} and Hannah Duval and Alba Romero-Rodr{\'i}guez and Alexandre Sevrin and Kevin Turbang",
note = "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",
year = "2024",
month = jul,
day = "26",
doi = "10.3847/2041-8213/ad5beb",
language = "English",
volume = "970",
journal = " The Astrophysical Journal Letters ",
issn = "2041-8205",
publisher = "IOP Publishing Ltd.",
number = "2",
}