Modeling High Spatial Resolution Images of Protostellar Disks

Details Modeling High Spatial Resolution Images of Protostellar Disks Modeling High Spatial Resolution Images of Protostellar Disks

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999alma.confe..77y&link_type=abstract

Science with the Atacama Large Millimeter Array (ALMA), Associated Universities, Inc., held October 6-8, 1999 at Carnegie Instit

Computer Science

Circumstellar Disks, Radiation, Protostellar, Hii, Uv

Scientific paper

The evolution and appearance of circumstellar disks in star forming regions are influenced strongly by the radiation from either the central star itself or close companions and nearby hot stars. UV radiation can heat the outer layers of the disk and induce expansion up to escape velocities. Hollenbach et al. (1999, PPIV, in press) consider this ``photoevaporation'' of disks as a principal, if not the most important, disk destruction mechanism. Assuming axial symmetry, we have previously performed radiation hydrodynamic calculations of the evolution of internally (Richling & Yorke, 1997, A&A, 327, 317) and externally (Richling & Yorke, 1998, A&A, 340, 508) UV-irradiated disks. These simulations provide us with the distributions of gas density, temperature and velocity as well as the dust temperature distribution of protostellar disks undergoing photoevaporation, useful for diagnostic radiation transfer modeling. We find sharp transitions between a) the neutral, molecular material in the disk, in Keplerian rotation, b) the neutral, mostly atomic outflowing (several km s-1) PDR material, and, if sufficient EUV is present, c) the ionized, outflowing (several 10 km s-1) HII material. High resolution line and continuum studies combined with detailed modeling will provide important constraints regarding the structure of protostellar disks and their UV environment. Hollenbach D., Yorke H.W., Johnstone D., 1999, Protostars and Planets IV, eds. V.Mannings, A. Boss, S. Russell, (Tucson: Univ. of Arizona Press), in press Richling S., Yorke H.W., 1997, A&A, 327, 317 Richling S., Yorke H.W., 1998, A&A, 340, 508

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