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  Formation of Lower Mass-gap Black Hole--Neutron Star Binary Mergers through Super-Eddington Stable Mass Transfer

Zhu, J.-P., Qin, Y., Wang, Z.-H.-T., Hu, R.-C., Zhang, B., & Wu, S. (2024). Formation of Lower Mass-gap Black Hole--Neutron Star Binary Mergers through Super-Eddington Stable Mass Transfer. Monthly Notices of the Royal Astronomical Society, 529(4), 4554-4564. doi:10.1093/mnras/stae815.

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 Creators:
Zhu, Jin-Ping, Author
Qin, Ying, Author
Wang, Zhen-Han-Tao, Author
Hu, Rui-Chong, Author
Zhang, Bing, Author
Wu, Shichao1, Author           
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE, Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR
 Abstract: Super-Eddington accretion of neutron stars (NSs) has been suggested both
observationally and theoretically. In this paper, we propose that NSs in
close-orbit binary systems with companions of helium (He) stars, most of which
systems form after the common-envelope phase, could experience super-Eddington
stable Case BB/BC mass transfer (MT), and can sometimes occur accretion-induced
collapses (AICs) to form lower mass-gap black holes (mgBHs). Our detailed
binary evolution simulations reveal that AIC events tend to happen if the
primaries NS have an initial mass $\gtrsim1.7\,M_\odot$ with an accretion rate
of $\gtrsim300$ times the Eddington limit. These mgBHs would have a mass nearly
equal to or slightly higher than the NS maximum mass. The remnant mgBH--NS
binaries after the core collapses of He stars are potential progenitors of
gravitational-wave (GW) source. Multimessenger observation between GW and
kilonova signals from a population of high-mass binary NS and mgBH--NS mergers
formed through super-Eddington stable MT are helpful in constraining the
maximum mass and equation of state of NSs. S230529ay, a mgBH--NS merger
candidate recently detected in the fourth observing run of the LIGO-Virgo-KAGRA
Collaboration, could possibly originate from this formation scenario.

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 Dates: 2023-10-222024-03-222024
 Publication Status: Issued
 Pages: MNRAS in press, 12 pages, 7 figures
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 2310.14256
DOI: 10.1093/mnras/stae815
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 529 (4) Sequence Number: - Start / End Page: 4554 - 4564 Identifier: -