Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-03
Astronomy and Astrophysics
Astrophysics
To be published in "The astrophysics of cataclysmic variables and related objects", ASP Conf. Ser., eds. J.M. Hameury and J.P.
Scientific paper
We argue that the recent thermal model of jet launching by young stellar objects, when applied to system containing disk-accreting white dwarfs naturally explain the otherwise astonishing absence of jets in cataclysmic variable stars. Thermal launching is possible when the accreted material is strongly shocked due to large gradients of physical quantities in the boundary layer (or at the inner boundary of a truncated disk) and then cools on a time scale longer than its ejection time from the disk. In our framework the magnetic fields are weak, and serve only to recollimate the outflow at large distances from the source, or to initiate the shock, but not as a jet-driving agent. Using criteria for shock formation and mass ejection, we find the mass accretion rate above which jets can be launched from boundary layers around accreting white dwarfs to be ~10^{-6} Mo/y, which explains the absence of jets in cataclysmic variable stars and their presence in other white-dwarf accreting systems such as super-soft X-ray sources, symbiotic stars and classical novae.
Lasota Jean-Pierre
Soker Noam
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