Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110002d&link_type=abstract
American Astronomical Society, AAS Meeting #211, #100.02; Bulletin of the American Astronomical Society, Vol. 39, p.911
Astronomy and Astrophysics
Astronomy
Scientific paper
Nearly all proto-planetary nebulae (pPNe) are bilobed with many showing evidence for highly collimated, often "jetlike," outflows. Many pPNe are found to be associated with circumstellar disks and magnetic fields as well. These facts suggest one scenario for the shaping of pPNe and their evolved cousins, the planetary nebulae (PNe), in which a magnetized stellar wind interacts with the magnetized wind of its surrounding disk. We therefore present a set of 2.5D MHD simulations modeling such a scenario, experimenting with a variety of opening angles, wind velocities, and mass loss rates for both the inner stellar wind and outer disk wind. In all of the simulations, the winds carry a dynamically significant toroidal magnetic field and are radiatively cooled. We find that all models lead to bilobed structures with outflows collimated to varying degrees. Models with an isotropic stellar wind interacting with a predominantly axial disk wind in particular lead to a very high degree of collimation suggestive of a highly focused jet.
Blackman Eric
Dennis Timothy J.
Frank Alejandro
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