Mergers of Binary Compact Objects

Details Mergers of Binary Compact Objects Mergers of Binary Compact Objects

2006-07-19

arxiv.org/abs/astro-ph/0607442v3

Astronomy and Astrophysics

Astrophysics

7 pages, substantial changes, accepted for publication in ApJ

Scientific paper

10.1086/521947

We work out the effects of hypercritical accretion, which transfers mass from the secondary to the primary (first-born) neutron star (NS) in a binary, showing that the mass of the primary would end up 0.6 M_sun greater than the secondary NS in contradiction with the very nearly equal masses of the two NS's in binaries measured to date. We discuss that the primary NS evolves into a low-mass black-hole (LMBH) due to the hypercritical accretion. Using a flat distribution in the mass ratio q (q = M_secondary/M_primary), we calculated a ratio of LMBH-NS and NS-NS systems to be 5, in rough agreement with Pinsonneault and Stanek (2006). These authors emphasize the importance of "twins", which we discuss. The two NS's in the twins would be close in mass and further increase the number of mergings.

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