Orbital eccentricity and spin precession are precious observables to infer the formation history of binary black holes with gravitational-wave data. We present a post-Newtonian, multi-timescale analysis of the binary dynamics able to capture both precession and eccentricity over long inspirals. We show that the evolution of an eccentric binary can be reduced to that of an effective source on quasicircular orbits, coupled to a post-Newtonian prescription for the secular evolution of the eccentricity. Our findings unveil an interplay between precession and eccentricity: the spins of eccentric binaries precess on shorter timescales and their nutation amplitude is altered compared to black holes on quasicircular orbits, consequently affecting the so-called spin morphology. Even if binaries circularize by the time they enter the sensitivity window of our detectors, their spin orientations retain some memory of the past evolution on eccentric orbits, thus providing a new link between gravitational-wave detection and astrophysical formation. At the same time, we point out that residual eccentricity should be considered a source of systematics when reconstructing the past history of black-hole binaries using the spin orientations.

Fumagalli, G., Gerosa, D. (2023). Spin-eccentricity interplay in merging binary black holes. PHYSICAL REVIEW D, 108(12) [10.1103/PhysRevD.108.124055].

Spin-eccentricity interplay in merging binary black holes

Fumagalli, G
;
Gerosa, D
2023

Abstract

Orbital eccentricity and spin precession are precious observables to infer the formation history of binary black holes with gravitational-wave data. We present a post-Newtonian, multi-timescale analysis of the binary dynamics able to capture both precession and eccentricity over long inspirals. We show that the evolution of an eccentric binary can be reduced to that of an effective source on quasicircular orbits, coupled to a post-Newtonian prescription for the secular evolution of the eccentricity. Our findings unveil an interplay between precession and eccentricity: the spins of eccentric binaries precess on shorter timescales and their nutation amplitude is altered compared to black holes on quasicircular orbits, consequently affecting the so-called spin morphology. Even if binaries circularize by the time they enter the sensitivity window of our detectors, their spin orientations retain some memory of the past evolution on eccentric orbits, thus providing a new link between gravitational-wave detection and astrophysical formation. At the same time, we point out that residual eccentricity should be considered a source of systematics when reconstructing the past history of black-hole binaries using the spin orientations.
Articolo in rivista - Articolo scientifico
gravitational waves, black holes
English
2023
108
12
124055
none
Fumagalli, G., Gerosa, D. (2023). Spin-eccentricity interplay in merging binary black holes. PHYSICAL REVIEW D, 108(12) [10.1103/PhysRevD.108.124055].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/462278
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