Simulation of interactions of an orbiting compact star with an accretion disk by smoothed particle hydrodynamics

Details Simulation of interactions of an orbiting compact star with an accretion disk by smoothed particle hydrodynamics Simulation of interactions of an orbiting compact star with an accretion disk by smoothed particle hydrodynamics

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436..249m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-367X), vol. 436, no. 1, p. 249-253

Computer Science

Numerical Analysis

13

Accretion Disks, Binary Stars, Black Holes (Astronomy), Computerized Simulation, Hydrodynamics, Kepler Laws, Newton Methods, Stellar Models, Angular Momentum, Density Distribution, Numerical Analysis

Scientific paper

We simulate interaction between a thin accretion disk (two-dimensional) around a massive black hole and an orbiting compact star, coplanar with the disk. We use the smoothed particle hydrodynamics technique for this purpose. We take into account the following main processes: (1) loss of energy and angular momentum of the companion due to the gravitational wave emission and (2) gain of momentum and angular momentum of the companion due to its accretion of the disk gas in the super-Keplerian region. We chose various mass ratios and accretion rates to demonstrate (a) formation of spiral shocks in the disk around the primary, (b) formation of a smaller disk around the secondary, and finally and most important, (c) stabilization of the orbit of the companion against coalescence with the primary. Such a stabilization, which was until now only a theoretical possibility, is realized by supplying a suitable amount of angular momentum from the disk to the companion to compensate for the loss due to gravitational waves.

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