Binary Population Synthesis: Methods, Normalization, and Surprises

Details Binary Population Synthesis: Methods, Normalization, and Surprises Binary Population Synthesis: Methods, Normalization, and Surprises

2001-02-13

arxiv.org/abs/astro-ph/0102229v1

Astronomy and Astrophysics

Astrophysics

15 pages, 1 figure, to appear in the proceedings ``The influence of binaries on stellar population studies'', Brussels, August

Scientific paper

In this paper we present a brief overview of population synthesis methods with a discussion of their main advantages and disadvantages. In the second part, we present some recent results from synthesis models of close binary compact objects with emphasis on the predicted rates, their uncertainties, and the model input parameters the rates are most sensitive to. We also report on a new evolutionary path leading to the formation of close double neutron stars (NS), with the unique characteristic that none of the two NS ever had the chance to be recycled by accretion. Their formation rates turn out to be comparable to or maybe even higher than those of recycled NS-NS binaries (like the ones observed), but their detection probability as binary pulsars is much smaller because of their short lifetimes. We discuss the implications of such a population for gravitational-wave detection of NS-NS inspiral events, and possibly for gamma-ray bursts and their host galaxies.

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