Formation of Low-Mass X-Ray Novae with Black Holes from Triple Systems

Details Formation of Low-Mass X-Ray Novae with Black Holes from Triple Systems Formation of Low-Mass X-Ray Novae with Black Holes from Triple Systems

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001arep...45..620k&link_type=abstract

Astronomy Reports, Volume 45, Issue 8, August 2001, pp.620-630

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We apply a population synthesis technique to study the formation and evolution of low-mass X-ray binaries with black holes, observed as X-ray novae, from hierarchical triple systems. A scenario is suggested in which an inner close binary system evolves into an X-ray system with a large mass ratio. The high rate of accretion onto the neutron star leads to a common envelope stage, which may result in the formation of a Thorne-Zytkow (TZ) object. During its evolution, the envelope of the TZ object expands, encompassing the third star. The recurrent common-envelope stage decreases the size of the orbit of the third star, leading to the formation of a lowmass X-ray nova with a black hole. The dynamical stability of triple systems automatically ensures that only lowmass X-ray novae form. We also consider the possible formation of an X-ray nova from a binary in the case of asymmetrical core collapse during a supernova explosion.

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