Influence of tidal dissipation on outcomes of binary-single encounters between stars and black holes in stellar clusters
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
Influence of tidal dissipation on outcomes of binary-single encounters between stars and black holes in stellar clusters. / Hellstrom, Lucas; Askar, Abbas; Trani, Alessandro A.; Giersz, Mirek; Church, Ross P.; Samsing, Johan.
In: Monthly Notices of the Royal Astronomical Society, Vol. 517, No. 2, 12.10.2022, p. 1695-1708.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Influence of tidal dissipation on outcomes of binary-single encounters between stars and black holes in stellar clusters
AU - Hellstrom, Lucas
AU - Askar, Abbas
AU - Trani, Alessandro A.
AU - Giersz, Mirek
AU - Church, Ross P.
AU - Samsing, Johan
PY - 2022/10/12
Y1 - 2022/10/12
N2 - In the cores of dense stellar clusters, close gravitational encounters between binary and single stars can frequently occur. Using the tsunami code, we computed the outcome of a large number of binary-single interactions involving two black holes (BHs) and a star to check how the inclusion of orbital energy losses due to tidal dissipation can change the outcome of these chaotic interactions. Each interaction was first simulated without any dissipative processes and then we systematically added orbital energy losses due to gravitational wave emission [using post-Newtonian (PN) corrections] and dynamical tides and recomputed the interactions. We find that the inclusion of tides increases the number of BH-star mergers by up to 75 per cent; however, it does not affect the number of BH-BH mergers. These results highlight the importance of including orbital energy dissipation due to dynamical tides during few-body encounters and evolution of close binary systems within stellar cluster simulations. Consistent with previous studies, we find that the inclusion of PN terms increases the number of BH-BH mergers during binary-single encounters. However, BH-star mergers are largely unaffected by the inclusion of these terms.
AB - In the cores of dense stellar clusters, close gravitational encounters between binary and single stars can frequently occur. Using the tsunami code, we computed the outcome of a large number of binary-single interactions involving two black holes (BHs) and a star to check how the inclusion of orbital energy losses due to tidal dissipation can change the outcome of these chaotic interactions. Each interaction was first simulated without any dissipative processes and then we systematically added orbital energy losses due to gravitational wave emission [using post-Newtonian (PN) corrections] and dynamical tides and recomputed the interactions. We find that the inclusion of tides increases the number of BH-star mergers by up to 75 per cent; however, it does not affect the number of BH-BH mergers. These results highlight the importance of including orbital energy dissipation due to dynamical tides during few-body encounters and evolution of close binary systems within stellar cluster simulations. Consistent with previous studies, we find that the inclusion of PN terms increases the number of BH-BH mergers during binary-single encounters. However, BH-star mergers are largely unaffected by the inclusion of these terms.
KW - galaxies: star clusters: general
KW - gravitation
KW - methods: numerical
KW - (stars:) binaries (including multiple): close
KW - stars: kinematics and dynamics
KW - MOCCA-SURVEY DATABASE
KW - ALGORITHMIC REGULARIZATION
KW - GLOBULAR-CLUSTERS
KW - COMPACT BINARIES
KW - CLOSE BINARIES
KW - EVOLUTION
KW - CODE
KW - SIMULATIONS
KW - DISRUPTION
KW - COLLISIONS
U2 - 10.1093/mnras/stac2808
DO - 10.1093/mnras/stac2808
M3 - Journal article
VL - 517
SP - 1695
EP - 1708
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 2
ER -
ID: 323613827