46 citations · 85 across the 13 of their papers we have counts for
15 papers
Four Which I Knew Not: The Hexadecapole Nearly Cancels the Octupole in Librating Kozai-Lidov Cycles
Ygal Y. Klein
Phenomena requiring close proximity between two bodies, from black-hole mergers to hot Jupiters, may originate in hierarchical triples, in which secular torques from a distant comp…
Hierarchical Three-Body Problem at High Eccentricities = Simple Pendulum, IV: Octupole for Librating Kozai-Lidov Cycles
Ygal Y. Klein
We solve analytically the long-term octupole evolution of \textit{librating} Kozai-Lidov cycles - those with a negative Kozai constant, in which the argument of pericenter librates…
Short-Range Forces Can Catalyze Extreme Orbital Evolution in Hierarchical Triples
Ygal Y. Klein, Chris Hamilton
Hierarchical triples are promising environments for producing exotica such as black hole mergers and hot Jupiters, because of the von Zeipel-Lidov-Kozai (ZLK) effect, whereby a dis…
von Zeipel-Kozai-Lidov oscillations in nearby bright stars. I. Lambda Ophiuchi
Idel Waisberg, Ygal Klein, Boaz Katz
The challenge of constraining both the inner and the outer orbits in multiple stars has resulted in a growing abyss between the rich theoretical and the sparse observational studie…
Which is the most eccentric binary known? Insights from the 2023/4 pericenter passages of Zeta Boötis and Eta Ophiuchi
Idel Waisberg, Ygal Klein, Boaz Katz
There is a clear dearth of very eccentric binaries among those for which individual eccentricities can be measured. In this paper we report on observations of the two nearby, brigh…
Kozai Lidov Cycles = Simple Pendulum
Roi D. Basha, Ygal Y. Klein, Boaz Katz
The quadrupole Kozai mechanism, which describes the hierarchical three-body problem in the leading order, is shown to be equivalent to a simple pendulum where the change in the ecc…
Hierarchical Three-Body Problem at High Eccentricities = Simple Pendulum III: Precessing Quadrupole
Ygal Y. Klein, Boaz Katz
The very long-term evolution of the hierarchical restricted three-body problem with a slightly aligned precessing quadrupole potential is investigated analytically and solved for b…
Hierarchical Three-Body Problem at High Eccentricities = Simple Pendulum II: Octupole including Brown's Hamiltonian
Ygal Y. Klein, Boaz Katz
The very long-term evolution of the hierarchical restricted three-body problem with a massive perturber is analyzed analytically in the high eccentricity regime. Perturbations on t…
Hierarchical Three-Body Problem at High Eccentricities = Simple Pendulum
Ygal Y. Klein, Boaz Katz
The gradual evolution of the restricted hierarchical three body problem is analyzed analytically, focusing on conditions of Kozai-Lidov Cycles that may lead to orbital flips from p…
Construction of a Multidimensional Parallel Adaptive Mesh Refinement Special Relativistic Hydrodynamics Code for Astrophysical Applications
Ygal Y. Klein
We have developed a new computer code, RELDAFNA, to solve the conservative equations of special relativistic hydrodynamics (SRHD) using adaptive mesh refinement (AMR) on parallel c…
Librating Kozai-Lidov Cycles with a Precessing Quadrupole Potential are Analytically Approximately Solved
Ygal Y. Klein, Boaz Katz
The very long-term evolution of the hierarchical restricted three-body problem with a slightly aligned precessing quadrupole potential is investigated analytically for librating Ko…
Analytic understanding of the resonant nature of Kozai Lidov Cycles with a precessing quadrupole potential
Ygal Y. Klein, Boaz Katz
The very long-term evolution of the hierarchical restricted three-body problem with a slightly aligned precessing quadrupole potential is studied analytically. This problem describ…
Binarity and beyond in A stars I. Survey description and first results of VLTI/GRAVITY observations of VAST targets with high Gaia-Hipparcos accelerations
Idel Waisberg, Ygal Klein, Boaz Katz
A-stars are the progenitors of about half of the white dwarfs (WDs) that currently exist. The connection between the multiplicity of A-stars and that of WDs is not known and the ob…
Beyond binarity in A stars II. Disentangling the four stars in the vicinity of the triple HIP 87813 within the quintuple system HJ2814
Idel Waisberg, Ygal Klein, Boaz Katz
A-stars are the progenitors of about half of the white dwarfs (WDs) that currently exist. The connection between the multiplicity of A-stars and that of WDs is not known and both m…
The Way To a Double Degenerate: per cent of Stars have a Companion
Ygal Klein, Boaz Katz
We find that per cent of A-type stars or red giants are bound with a massive companion () in an intermediate wide orbit ($0.5<P<5000\mb…