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Origin of Two Types of X-Ray Outbursts in Be/X-Ray Binaries. I. Accretion Scenarios
Atsuo T. Okazaki, Kimitake Hayasaki, Yuki Moritani
We propose the new scenario for X-ray outbursts in Be/X-ray binaries that normal and giant outbursts are respectively caused by radiatively inefficient accretion flows (RIAFs) and…
Binary Black Hole Accretion Flows From a Misaligned Circumbinary Disk
Kimitake Hayasaki, Hideki Saito, Shin Mineshige
We study the basic properties of accretion flows onto binary supermassive black holes, including the cases in which a circumbinary disk is misaligned with the binary orbital plane,…
Finite, Intense Accretion Bursts from Tidal Disruption of Stars on Bound Orbits
Kimitake Hayasaki, Nicholas Stone, Abraham Loeb
We study accretion processes for tidally disrupted stars approaching supermassive black holes on bound orbits, by performing three dimensional Smoothed Particle Hydrodynamics simul…
Tidal disruption flares from stars on eccentric orbits
Kimitake Hayasaki, Nicholas Stone, Abraham Loeb
We study tidal disruption and subsequent mass fallback for stars approaching supermassive black holes on bound orbits, by performing three dimensional Smoothed Particle Hydrodynami…
Modeling high-energy light curves of the PSR B1259-63/LS 2883 binary based on 3-D SPH simulations
J. Takata, A. T. Okazaki, S. Nagataki +7
Temporal changes of X-ray to very-high-energy gamma-ray emissions from the pulsar-Be star binary PSR B1259-63/LS 2883 are studied based on 3-D SPH simulations of pulsar wind intera…
Gravitational wave diagnosis of a circumbinary disk
Kimitake Hayasaki, Kent Yagi, Takahiro Tanaka +1
When binary black holes are embedded in a gaseous environment, a rotating disk surrounding them, the so-called circumbinary disk, will be formed. The binary exerts a gravitational…