Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-14
Class.Quant.Grav.22:S453-S456,2005; Mon.Not.Roy.Astron.Soc.356:627-636,2005
Astronomy and Astrophysics
Astrophysics
10 pages, 11 figures, accepted for publication in MNRAS. Figures 4 and 5 are low resolution
Scientific paper
10.1088/0264-9381/22/10/042 10.1
We compute the emission of gravitational radiation from the merging of a close white dwarf binary system. This is done for a wide range of masses and compositions of the white dwarfs, ranging from mergers involving two He white dwarfs, mergers in which two CO white dwarfs coalesce to mergers in which a massive ONe white dwarf is involved. In doing so we follow the evolution of binary system using a Smoothed Particle Hydrodynamics code. Even though the coalescence process of the white dwarfs involves considerable masses, moving at relatively high velocities with a high degree of asymmetry we find that the signature of the merger is not very strong. In fact, the most prominent feature of the coalescence is that in a relatively small time scale (of the order of the period of the last stable orbit, typically a few minutes) the sources stop emitting gravitational waves. We also discuss the possible implications of our calculations for the detection of the coalescence within the framework of future space-borne interferometers like LISA.
Garcia-Berro Enrique
Guerrero Julio
Isern Jordi
Lobo Alberto J.
Lorén-Aguilar Pablo
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