Supernovae in massive binaries and compact object mergers near supermassive black holes

Abstract

Nuclear star clusters that surround supermassive black holes (SMBHs) in galactic nuclei are among the densest systems in the Universe, harbouring millions of stars and compact objects (COs). Within a few parsecs from the SMBH, stars can form binaries. In this paper, we model the supernova (SN) process of massive binaries that are born in proximity of the SMBH and that produce CO binaries. These binaries can later merge via emission of gravitational waves as a consequence of the Lidov-Kozai mechanism. We study the dynamical evolution of these systems by means of high-precision $N$-body simulations, including post-Newtonian (PN) terms up to 2.5PN order. We adopt different prescriptions for the natal velocity kicks imparted during the SN processes and find that larger kicks lead to more compact binaries that merge closer to the SMBH. We also conclude that most of the mergers enter the LIGO band with very high eccentricities. Finally, we compute a merger rate of $0.05$--$0.07{\mathrm{Gpc}}^{-3}{\mathrm{yr}}^{-1}$, $0.04$--$2\times 10^{-3}{\mathrm{Gpc}}^{-3}{\mathrm{yr}}^{-1}$, $9.6\times 10^{-6}$--$2.7\times 10^{-3}{\mathrm{Gpc}}^{-3}{\mathrm{yr}}^{-1}$ for BH-BH, BH-NS, NS-NS, respectively, smaller than the actual LIGO-Virgo observed rate.

18 pages, 6 figures, 1 table, accepted by JCAP

References in corpus (32)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• GW170814: A Three-Detector Observation of Gravitational Waves from a Binary Black Hole Coalescence
• Binary interaction dominates the evolution of massive stars
• Pulsational Pair-Instability Supernovae
• The Effect of Pair-Instability Mass Loss on Black Hole Mergers
• MOCCA-SURVEY Database I: Coalescing Binary Black Holes Originating From Globular Clusters
• Lidov-Kozai Cycles with Gravitational Radiation: Merging Black Holes in Isolated Triple Systems
• Toward Complete Statistics of Massive Binary Stars: Penultimate Results from the Cygnus OB2 Radial Velocity Survey
• Stellar remnants in galactic nuclei: mass segregation
• Stellar-mass black holes in young massive and open stellar clusters and their role in gravitational-wave generation II
• Black hole mergers from quadruples
• Algorithmic regularization with velocity-dependent forces
• The Fate of Binaries in the Galactic Center: The Mundane and the Exotic
• Secular Evolution Of Binaries Near Massive Black Holes: Formation of compact binaries, merger/collision products and G2-like objects
• On the coexistence of stellar-mass and intermediate-mass black holes in globular clusters
• Black hole-neutron star mergers from triples
• A numerical study of vector resonant relaxation
• Runaway and hypervelocity stars in the Galactic halo: Binary rejuvenation and triple disruption
• Binary dynamics near a massive black hole
• The impact of mass segregation and star-formation on the rates of gravitational-wave sources from extreme mass ratio inspirals
• An analytic model for mass transfer in binaries with arbitrary eccentricity, with applications to triple-star systems
• Formation and evolution of nuclear star clusters with in-situ star-formation: Nuclear cores and age segregation
• Hypervelocity Collisions of Binary Stars at the Galactic Centre
• In Search of the Thermal Eccentricity Distribution
• Eccentric binary black hole mergers in globular clusters hosting intermediate-mass black holes
• Hypervelocity stars from young stellar clusters in the Galactic Centre
• On the origins of enigmatic stellar populations in Local Group galactic nuclei
• Steeper stellar cusps in galactic centers from binary disruption
• The Galactic Center: Improved Relative Astrometry for Velocities, Accelerations, and Orbits near the Supermassive Black Hole
• Massive binary star mergers in galactic nuclei: implications for blue stragglers, binary S-stars and gravitational waves
• Tidal breakup of triple stars in the Galactic Centre
• Eclipsing Stellar Binaries in the Galactic Center

Cited by in corpus (1)

• Intermediate mass black holes' effect on compact object binaries