91 citations · 539 across the 22 of their papers we have counts for
22 papers
Dynamical constraints on the S2 (S0-2) star possible companions
Rodrigo P. Silva, Alexandre C. M. Correia, Tjarda C. N. Boekholt +1
The center of the Galaxy harbors a supermassive black hole, Sgr\,A*, which is surrounded by a massive star cluster known as the S-cluster. The most extensively studied star in this…
Capture of field stars by dark substructures
Jorge Peñarrubia, Raphaël Errani, Matthew G. Walker +2
We use analytical and -body methods to study the capture of field stars by gravitating substructures moving across a galactic environment. The majority of stars captured by a su…
Disc Novae: Thermodynamics of Gas Assisted Binary Black Hole Formation in AGN Discs
Henry Whitehead, Connar Rowan, Tjarda Boekholt +1
We investigate the thermodynamics of close encounters between stellar mass black holes (BHs) in the gaseous discs of active galactic nuclei (AGN), during which binary black holes (…
Black Hole Binaries in AGN Accretion Discs II: Gas Effects on Black Hole Satellite Scatterings
Connar Rowan, Henry Whitehead, Tjarda Boekholt +2
The black hole (BH) binaries in active galactic nuclei (AGN) are expected to form mainly through scattering encounters in the ambient gaseous medium. Recent simulations, including…
Gas Assisted Binary Black Hole Formation in AGN Discs
Henry Whitehead, Connar Rowan, Tjarda Boekholt +1
We investigate close encounters by stellar mass black holes (BHs) in the gaseous discs of active galactic nuclei (AGN) as a potential formation channel of binary black holes (BBHs)…
Punctuated Chaos and Indeterminism in Self-gravitating Many-body Systems
Tjarda C. N. Boekholt, Simon F. Portegies Zwart, Douglas C. Heggie
Dynamical chaos is a fundamental manifestation of gravity in astrophysical, many-body systems. The spectrum of Lyapunov exponents quantifies the associated exponential response to…
Stirred, not shaken: Star cluster survival in the slingshot scenario
D. Matus Carrillo, M. Fellhauer, T. Boekholt +2
We investigate the effects of an oscillating gas filament on the dynamics of its embedded stellar clusters. Motivated by recent observational constraints, we model the host gas fil…
Reversible time-step adaptation for the integration of few-body systems
Tjarda C. N. Boekholt, Timothee Vaillant, Alexandre C. M. Correia
The time step criterion plays a crucial role in direct N-body codes. If not chosen carefully, it will cause a secular drift in the energy error. Shared, adaptive time step criteria…
Black Hole Binary Formation in AGN Discs: From Isolation to Merger
Connar Rowan, Tjarda Boekholt, Bence Kocsis +1
Motivated by the increasing number of detections of merging black holes by LIGO-VIRGO-KAGRA, black hole (BH) binary mergers in the discs of active galactic nuclei (AGN) is investig…
A direct N-body integrator for modelling the chaotic, tidal dynamics of multi-body extrasolar systems: TIDYMESS
Tjarda C. N. Boekholt, Alexandre C. M. Correia
Tidal dissipation plays an important role in the dynamical evolution of moons, planets, stars and compact remnants. The interesting complexity originates from the interplay between…
On the Jacobi capture origin of binaries with applications to the Earth-Moon system and black holes in galactic nuclei
Tjarda C. N. Boekholt, Connar Rowan, Bence Kocsis
Close encounters between two bodies in a disc often result in a single orbital deflection. However, within their Jacobi volumes, where the gravitational forces between the two bodi…
The relativistic Pythagorean three-body problem
Tjarda C. N. Boekholt, Arend Moerman, Simon F. Portegies Zwart
We study the influence of relativity on the chaotic properties and dynamical outcomes of an unstable triple system; the Pythagorean three-body problem. To this end, we extend the B…
Chaos in self-gravitating many-body systems: Lyapunov time dependence of and the influence of general relativity
Simon F. Portegies Zwart, Tjarda C. N. Boekholt, Emiel Por +2
In self-gravitating -body systems, small perturbations introduced at the start, or infinitesimal errors that are produced by the numerical integrator or are due to limited preci…
Effect of mass loss due to stellar winds on the formation of supermassive black hole seeds in dense nuclear star clusters
Arpan Das, Dominik R. G. Schleicher, Shantanu Basu +1
The observations of high redshifts quasars at have revealed that supermassive black holes (SMBHs) of mass were already in place within…
Stellar collisions in flattened and rotating Pop. III star clusters
M. Z. C. Vergara, D. R. G. Schleicher, T. C. N. Boekholt +4
Fragmentation often occurs in disk-like structures, both in the early Universe and in the context of present-day star formation. Supermassive black holes (SMBHs) are astrophysical…
Formation of supermassive black hole seeds in nuclear star clusters via gas accretion and runaway collisions
Arpan Das, Dominik R. G. Schleicher, Nathan W. C. Leigh +1
More than two hundred supermassive black holes (SMBHs) of masses have been discovered at . One promising pathway for the formation o…
Formation of SMBH seeds in Pop III star clusters through collisions : the importance of mass loss
P. J. Alister Seguel, D. R. G. Schleicher, T. C. N. Boekholt +2
Runaway collisions in dense clusters may lead to the formation of supermassive black hole (SMBH) seeds, and this process can be further enhanced by accretion, as recent models of S…
Formation of massive black holes via collisions and accretion
D. R. G. Schleicher, M. A. Fellhauer, T. Boekholt +13
To explain the observed population of supermassive black holes at z~7, very massive seed black holes or, alternatively, super-Eddington scenarios are needed to reach final masses o…
Collisions in Primordial Star Clusters: Formation Pathway for intermediate mass black holes
B. Reinoso, D. R. G. Schleicher, M. Fellhauer +2
Collisions were suggested to potentially play a role in the formation of massive stars in present day clusters, and have likely been relevant during the formation of massive stars…
Dynamical Ejections of Stars due to an Accelerating Gas Filament
Tjarda C. N. Boekholt, Amelia M. Stutz, Michael Fellhauer +2
Observations of the Orion-A integral shaped filament (ISF) have shown indications of an oscillatory motion of the gas filament. This evidence is based on both the wave-like morphol…
The Origin of Chaos in the Orbit of Comet 1P/Halley
Tjarda C. N. Boekholt, F. Inti Pelupessy, Douglas C. Heggie +1
According to Munoz-Gutierrez et al. (2015) the orbit of comet 1P/Halley is chaotic with a surprisingly small Lyapunov time scale of order its orbital period. In this work we analys…
On the minimal accuracy required for simulating self-gravitating systems by means of direct N-body methods
Simon Portegies Zwart, Tjarda Boekholt
The conservation of energy, linear momentum and angular momentum are important drivers for our physical understanding of the evolution of the Universe. These quantities are also co…