Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-25
Astronomy and Astrophysics
Astrophysics
Proceedings for the Scientific Frontiers in Research on Extrasolar Planets Conference. Movies available from http://westworld.
Scientific paper
Previous simulations of self-gravitating protostellar disks have shown that, once developed, gravitational instabilities are enhanced by cooling the disk constantly during its evolution (Pickett et al. 2002). These earlier calculations included a very simple form of volumetric cooling, with a constant cooling time throughout the disk, which acted against the stabilizing effects of shock heating. The present work incorporates more realistic treatments of energy transport. The initial disk model extends from 2.3 to 40 AU, has a mass of 0.07 Msun and orbits a 0.5 Msun star. The models evolve for a period of over 2500 years, during which extensive spiral arms form. The disks structure is profoundly altered, transient clumps form in one case, but no permanent bound companion objects develop.
Durisen Richard H.
Mejia Annie C.
Pickett Megan K.
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