Eccentric Signatures of Stellar-Mass Binary Black Holes with Circumbinary Disks in LISA
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| Format: | Preprint |
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2024
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| author | Romero-Shaw, Isobel M. Goorachurn, Samir Siwek, Magdalena Moore, Christopher J. |
| author_facet | Romero-Shaw, Isobel M. Goorachurn, Samir Siwek, Magdalena Moore, Christopher J. |
| contents | Stellar-mass binary black holes may have circumbinary disks if formed through common-envelope evolution or within gaseous environments. Disks can drive binaries into wider and more eccentric orbits, while gravitational waves harden and circularise them. We combine cutting-edge evolution prescriptions for disk-driven binaries with well-known equations for gravitational-wave-driven evolution, and study the evolution of stellar-mass binary black holes. We find that binaries are driven by their disk to an equilibrium eccentricity, $0.2\lesssim e_\mathrm{eq} \lesssim0.5$, that dominates their evolution. Once they transition to the GW-dominated regime their eccentricity decreases rapidly; we find that stellar-mass binary black holes with long-lived disks will likely be observed in LISA with detectable eccentricities $\sim 10^{-2}$ at $0.01$ Hz, with the precise value closely correlating with the binary's initial mass ratio. This may lead stellar-mass binary black holes with CBDs observed in LISA to be confused with dynamically-formed binary black holes. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2407_03869 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Eccentric Signatures of Stellar-Mass Binary Black Holes with Circumbinary Disks in LISA Romero-Shaw, Isobel M. Goorachurn, Samir Siwek, Magdalena Moore, Christopher J. High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology Stellar-mass binary black holes may have circumbinary disks if formed through common-envelope evolution or within gaseous environments. Disks can drive binaries into wider and more eccentric orbits, while gravitational waves harden and circularise them. We combine cutting-edge evolution prescriptions for disk-driven binaries with well-known equations for gravitational-wave-driven evolution, and study the evolution of stellar-mass binary black holes. We find that binaries are driven by their disk to an equilibrium eccentricity, $0.2\lesssim e_\mathrm{eq} \lesssim0.5$, that dominates their evolution. Once they transition to the GW-dominated regime their eccentricity decreases rapidly; we find that stellar-mass binary black holes with long-lived disks will likely be observed in LISA with detectable eccentricities $\sim 10^{-2}$ at $0.01$ Hz, with the precise value closely correlating with the binary's initial mass ratio. This may lead stellar-mass binary black holes with CBDs observed in LISA to be confused with dynamically-formed binary black holes. |
| title | Eccentric Signatures of Stellar-Mass Binary Black Holes with Circumbinary Disks in LISA |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2407.03869 |