Towards gravitational wave parameter inference for binaries with an eccentric companion
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915752339046400 |
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| author | Hendriks, Kai Zwick, Lorenz Saini, Pankaj Takátsy, János Samsing, Johan |
| author_facet | Hendriks, Kai Zwick, Lorenz Saini, Pankaj Takátsy, János Samsing, Johan |
| contents | We introduce a complete model for dephasing due to line-of-sight acceleration (LOSA) in gravitational wave (GW) signals from stellar-mass binary black holes (BBHs) in three-body systems. Our prescription provides curvature- and projection-dependent phase features that are not recovered by local-expansion-based treatments. We perform parameter-space surveys and mock parameter inferences assuming the nominal sensitivity of the Einstein Telescope (ET) to identify the regime where the time-varying LOSA allows for separate constraints on the outer orbital parameters, in particular the tertiary mass and distance. We estimate that ET may detect a few to tens of such systems per year, provided that all binaries merge dynamically, and demonstrate that these constraints can be used to directly discriminate between a dynamical and AGN origin for BBHs. Finally, we reanalyse the GW190814 event and four O4a events finding no evidence for LOSA, with the previously claimed LOSA in GW190814 disappearing when a sufficiently long data segment is used. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_14918 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Towards gravitational wave parameter inference for binaries with an eccentric companion Hendriks, Kai Zwick, Lorenz Saini, Pankaj Takátsy, János Samsing, Johan High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology We introduce a complete model for dephasing due to line-of-sight acceleration (LOSA) in gravitational wave (GW) signals from stellar-mass binary black holes (BBHs) in three-body systems. Our prescription provides curvature- and projection-dependent phase features that are not recovered by local-expansion-based treatments. We perform parameter-space surveys and mock parameter inferences assuming the nominal sensitivity of the Einstein Telescope (ET) to identify the regime where the time-varying LOSA allows for separate constraints on the outer orbital parameters, in particular the tertiary mass and distance. We estimate that ET may detect a few to tens of such systems per year, provided that all binaries merge dynamically, and demonstrate that these constraints can be used to directly discriminate between a dynamical and AGN origin for BBHs. Finally, we reanalyse the GW190814 event and four O4a events finding no evidence for LOSA, with the previously claimed LOSA in GW190814 disappearing when a sufficiently long data segment is used. |
| title | Towards gravitational wave parameter inference for binaries with an eccentric companion |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2601.14918 |