Evolution of Stellar Orbits Around Merging Massive Black-Hole Binary

Abstract

We study the long-term orbital evolution of stars around a merging massive or supermassive black-hole (BH) binary, taking into account the general relativistic effect induced by the BH spin. When the BH spin is significant compared to and misaligned with the binary orbital angular momentum, the orbital axis ($\hat{\mathbf{l}}$) of the circumbinary star can undergo significant evolution during the binary orbital decay driven by gravitational radiation. Including the spin effect of the primary (more massive) BH, we find that starting from nearly coplanar orbital orientations, the orbital axes $\hat{\mathbf{l}}$ of circumbinary stars preferentially evolve towards the spin direction after the merger of the BH binary, regardless of the initial BH spin orientation. Such alignment phenomenon, i.e., small final misalignment angle between $\hat{\mathbf{l}}$ and the spin axis of the remanent BH $\hat{\mathbf{S}}$, can be understood analytically using the principle of adiabatic invariance. For the BH binaries with extremely mass ratio ($m_2/m_1\lesssim 0.01$), $\hat{\mathbf{l}}$ may experience more complicated evolution as adiabatic invariance breaks down, but the trend of alignment still works reasonably well when the initial binary spin-orbit angle is relatively small. Our result suggests that the correlation between the orientations of stellar orbits and the spin axis of the central BH could provide a potential signature of the merger history of the massive BH.

arXiv comment13 pages, 15 figures, accepted for publication in MNRAS

References in corpus (44)

• Measuring Distance and Properties of the Milky Way's Central Supermassive Black Hole with Stellar Orbits
• Long-Term Stability of Planets in Binary Systems
• The Eccentric Kozai-Lidov Effect and Its Applications
• High Proper Motion Stars in the Vicinity of Sgr A*: Evidence for a Supermassive Black Hole at the Center of Our Galaxy
• Discovery of a binary AGN in the ultraluminous infrared galaxy NGC 6240 using Chandra
• Formation of Galactic Nuclei
• A Compact Supermassive Binary Black Hole System
• Stellar disk in the galactic center -- a remnant of a dense accretion disk?
• Massive black hole binary mergers within sub-pc scale gas discs
• Stellar Dynamics in the Galactic centre: Proper Motions and Anisotropy
• Formation and Evolution of Compact Object Binaries in AGN Disks
• Rapid Formation of Supermassive Black Hole Binaries in Galaxy Mergers with Gas
• The Role of Gas in the Merging of Massive Black Holes in Galactic Nuclei. II. Black Hole Merging in a Clumpy Disk
• The Afterglow of Massive Black Hole Coalescence
• Supermassive black hole binaries in gaseous and stellar circumnuclear discs: orbital dynamics and gas accretion
• The Quest for Dual and Binary Supermassive Black Holes: A Multi-Messenger View
• A recoiling supermassive black hole in the quasar SDSSJ092712.65+294344.0?
• A Candidate Sub-Parsec Supermassive Binary Black Hole System
• Suppression of extreme orbital evolution in triple systems with short range forces
• Steady-state planet migration by the Kozai-Lidov mechanism in stellar binaries
• Chandra unveils a binary Active Galactic Nucleus in Mrk463
• Remnant Masses, Spins and Recoils from the Merger of Generic Black-Hole Binaries
• High inclination orbits in the secular quadrupolar three-body problem
• Stellar Dynamics and Stellar Phenomena Near A Massive Black Hole
• Mass-gap Mergers in Active Galactic Nuclei
• Hydrodynamics of galaxy mergers with supermassive black holes: is there a last parsec problem ?
• A close-pair binary in a distant triple supermassive black-hole system
• A 1.75 kpc/h Separation Dual AGN at z=0.36 in the COSMOS Field
• Hierarchical Black-Hole Mergers in Multiple Systems: Constrain the Formation of GW190412, GW190814 and GW190521-like events
• SDSS J092712.65+294344.0: Recoiling Black Hole or A Sub-parsec Binary Candidate?
• SDSSJ092712.65+294344.0: a candidate massive black hole binary
• Constraining the Orbit of Supermassive Black Hole Binary 0402+379
• Survey of Kozai Dynamics Beyond Neptune
• Inclination Evolution of Protoplanetary Disks Around Eccentric Binaries
• Constraining Sub-Parsec Binary Supermassive Black Holes in Quasars with Multi-Epoch Spectroscopy. II. The Population with Kinematically Offset Broad Balmer Emission Lines
• The Eccentric Kozai-Lidov mechanism for Outer Test Particle
• SDSS J1254+0846: A Binary Quasar Caught in the Act of Merging
• An upper limit on the spin of SgrA${}^{\ast }$ based on stellar orbits in its vicinity
• Binary Mergers near a Supermassive Black Hole: Relativistic Effects in Triples
• Secular Dynamics of an Exterior Test Particle: The Inverse Kozai and Other Eccentricity-Inclination Resonances
• The Origin of Double-peaked Narrow Lines in Active Galactic Nuclei. IV. Association with Galaxy Mergers
• Merging Compact Binaries Near a Rotating Supermassive Black Hole: Eccentricity Excitation due to Apsidal Precession Resonance
• Merging Compact Binaries in Hierarchical Triple Systems: Resonant Excitation of Binary Eccentricity
• Probing the Spins of Supermassive Black Holes with Gravitational Waves from Surrounding Compact Binaries

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