Abstract
Gravitational-wave astronomy has revealed a population of stellar-mass black holes more massive than observed previously by other means. The maximum mass of black holes formed in isolated binaries is determined by stellar winds, mixing processes and interactions between the binary components. We consider the impact that fully self-consistent, detailed stellar-structure and binary-evolution calculations have on the population synthesis of black-hole binaries at solar metallicity. We find a qualitatively different picture from previous studies employing rapid population-synthesis techniques. Merging binary black holes form with a non-negligible rate (\(\sim 4\times 1{0}^{-7}\,{M}_{\odot }^{-1}\)) and their progenitor stars with initial masses ≳50 M⊙ do not expand to supergiant radii, thereby largely avoiding substantial dust-driven or luminous blue variable winds. The progenitor stars lose less mass in winds, which results in black holes as massive as ~30 M⊙, and approximately half avoid a mass-transfer episode before forming the first-born black hole. Binaries with initial periods of a few days, some of which may undergo Roche-lobe overflow mass transfer, result in mildly spinning first-born black holes, χBH1 ≲ 0.2, assuming efficient angular-momentum transport.
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Data availability
The source and Supplementary Data used in the main manuscript and Supplementary Discussion are publicly available on Zenodo65. The dataset includes all single-stellar model variations discussed in the manuscript and the BBH population synthesis model that can be used to reproduce our results. Additionally, POSYDON v.1.0 single and binary grid datasets can be found on Zenodo66.
Code availability
The POSYDON v.1.0 software used to generate the BBH population synthesis and single-stellar models is open source and is available on GitHub67. Additionally, the software used to compute double compact object merger rates and to generate the intrinsic and detectable BBH observable distributions in Fig. 4 is available on GitHub68.
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Acknowledgements
The POSYDON project is supported primarily by two sources: the Swiss National Science Foundation Professorship grant (PI Fragos, project numbers PP00P2_176868 and PP00P2_211006) and the Gordon and Betty Moore Foundation (PI Kalogera, grant award GBMF8477). S.S.B., T.F., D.M. and E.Z. were supported by the project PP00P2_176868 and S.S.B., T.F., M.K. and Z.X. were supported by the project number PP00P2_211006. Z.X. was also supported by the Chinese Scholarship Council (CSC). E.Z. acknowledges funding support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 772086). V.K., A.D., K.A.R., P.M.S. and M.S. were supported by the project number GBMF8477. C.P.L.B. acknowledges support from the University of Glasgow. K.K. acknowledges support from the Federal Commission for Scholarships for Foreign Students for the Swiss Government Excellence Scholarship (ESKAS no. 2021.0277) and the Spanish State Research Agency, through the María de Maeztu Program for Centers and Units of Excellence in R&D, no. CEX2020-001058-M. K.A.R. also thanks the LSSTC Data Science Fellowship Program, funded by LSSTC, NSF Cybertraining grant no. 1829740, the Brinson Foundation and the Moore Foundation; their participation in the programme has benefited this work. The computations were performed at Northwestern University on the Trident computer cluster (funded by the GBMF8477 award) and at the University of Geneva on the Yggdrasil computer cluster. This research was partly supported by the computational resources and staff contributions provided for the Quest high-performance computing facility at Northwestern University, jointly supported by the Office of the Provost, the Office for Research and Northwestern University Information Technology. All figures were made with the open-source Python module Matplotlib69. This research used the Python modules Astropy70, iPython71, Numpy72, Pandas73 and SciPy74.
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All authors contributed to the work presented in this paper. S.S.B. led the writing with substantial contributions from T.F., E.Z., J.J.A., V.K., C.P.L.B. and M.K. The results presented in this study were obtained using the open-source software POSYDON, which was developed by S.S.B., T.F., J.J.A., E.Z., A.D., K.K., D.M., K.A.R., P.M.S., M.S. and Z.X.
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Bavera, S.S., Fragos, T., Zapartas, E. et al. The formation of merging black holes with masses beyond 30 M⊙ at solar metallicity. Nat Astron 7, 1090–1097 (2023). https://doi.org/10.1038/s41550-023-02018-5
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DOI: https://doi.org/10.1038/s41550-023-02018-5