Circumstellar Disks

Details Circumstellar Disks Circumstellar Disks

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..211b&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

Computer Science

2

Scientific paper

Circumstellar disks are commonly found surrounding young stars during the first few million years after their birth. The disks are a reservoir for matter and angular momentum during the collapse of cloud cores to make stars. They often contain as much matter as the primitive solar nebular prior to the formation of the planets. These properties have been well-established by observations at infrared and millimeter-wavelengths and by direct images with the Hubble Space Telescope. Recent infrared observations with ISO show that both the inner and outer parts of disks disappear over similar timescales of several million years, that the radiative properties imply external heating to maintain energy balance, and that the composition of the particles is almost identical to that of primitive bodies in the solar system. Recent observations with HST show that the disks are flared, sharply bounded at their outer radii, and often have residual matter above and below the disk plane. The recent data largely resolve early ambiguity about the nature of some disks and continue to support the notion that these disks will give rise to planetary systems orbiting the stars.

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