The Formation of Comets by Radiation Pressure in the Outer Protosun. III. Dependence on the Anisotropy of the Radiation Field

Details The Formation of Comets by Radiation Pressure in the Outer Protosun. III. Dependence on the Anisotropy of the Radiation Field The Formation of Comets by Radiation Pressure in the Outer Protosun. III. Dependence on the Anisotropy of the Radiation Field

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88.1522h&link_type=abstract

Astronomical Journal, v.88, p.1522

Astronomy and Astrophysics

Astronomy

6

Scientific paper

A two-dimensional, radiation-hydrodynamic code with dust was used to study the effect of an anisotropic radiation field on the formation of comets in the outer protosun by the radiation pressure from the Sun and surrounding protostars. If the radiation field is isotropic, the results are very similar to those found earlier by analytic models. When the dust cloud is flanked on two sides by luminous walls of equal strength but with no radiation entering the cloud from the azimuthal direction (a radiation vise), most of the dust eventually squeezes out the sides of the vise. The sides are open to outward streaming radiation which carries the dust with it. However, the entrance of even a small amount of radiation from the sides causes the dust to drift inward to form the comet. The work given in this paper indicates that a highly anisotropic radiation field is not likely to prevent the formation of a comet. It distorts the shape of the inward drifting dust cloud. Initially, faster inward drift occurs along radii having the strongest inward radiation flux. This in turn causes the optical depth to increase faster along the perpendicular radii where the field is the weakest. The increase in the optical depth eventually compensates for the low radiation flux, so as the cloud shrinks the radiation pressure increases faster at the surface of the cloud along those radius vectors where the radiation flux has a minimum. Although ;the dust cloud in the anisotropic radiation field attains a very irregular shape, eventually all parts of the cloud contract in unison and arrive at the center of the cloud at about the same time.

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