Gas-induced perturbations on the gravitational wave in-spiral of live post-Newtonian LISA massive black hole binaries
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| Format: | Preprint |
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2024
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| author | Garg, Mudit Franchini, Alessia Lupi, Alessandro Bonetti, Matteo Mayer, Lucio |
| author_facet | Garg, Mudit Franchini, Alessia Lupi, Alessandro Bonetti, Matteo Mayer, Lucio |
| contents | We investigate the effect of dynamically coupling gas torques with gravitational wave (GW) emission during the orbital evolution of an equal-mass massive black hole binary (MBHB). We perform hydrodynamical simulations of eccentric MBHBs with total mass $M=10^6~{\rm M}_\odot$ embedded in a prograde locally isothermal circumbinary disk (CBD). We evolve the binary from $55$ to $49$ Schwarzschild radii separations using up to 2.5 post-Newtonian (PN) corrections to the binary dynamics, which allow us to follow the GW-driven in-spiral. For the first time, we report the measurement of gas torques onto a live binary a few years before the merger, with and without concurrent GW radiation. We also report the gas-induced orbital dephasing $δϕ_{\rm orb}\sim-0.007$ rad over $278$ orbital cycles that is likely driven mainly by disc-induced precession and LISA should be able to detect it at redshift $z=1$. Our results show how GWs alone can be used to probe the astrophysical properties of CBDs and have important implications for multi-messenger strategies aimed at studying the environments of MBHBs. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_17305 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gas-induced perturbations on the gravitational wave in-spiral of live post-Newtonian LISA massive black hole binaries Garg, Mudit Franchini, Alessia Lupi, Alessandro Bonetti, Matteo Mayer, Lucio High Energy Astrophysical Phenomena Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies General Relativity and Quantum Cosmology We investigate the effect of dynamically coupling gas torques with gravitational wave (GW) emission during the orbital evolution of an equal-mass massive black hole binary (MBHB). We perform hydrodynamical simulations of eccentric MBHBs with total mass $M=10^6~{\rm M}_\odot$ embedded in a prograde locally isothermal circumbinary disk (CBD). We evolve the binary from $55$ to $49$ Schwarzschild radii separations using up to 2.5 post-Newtonian (PN) corrections to the binary dynamics, which allow us to follow the GW-driven in-spiral. For the first time, we report the measurement of gas torques onto a live binary a few years before the merger, with and without concurrent GW radiation. We also report the gas-induced orbital dephasing $δϕ_{\rm orb}\sim-0.007$ rad over $278$ orbital cycles that is likely driven mainly by disc-induced precession and LISA should be able to detect it at redshift $z=1$. Our results show how GWs alone can be used to probe the astrophysical properties of CBDs and have important implications for multi-messenger strategies aimed at studying the environments of MBHBs. |
| title | Gas-induced perturbations on the gravitational wave in-spiral of live post-Newtonian LISA massive black hole binaries |
| topic | High Energy Astrophysical Phenomena Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2410.17305 |