Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30..766r&link_type=abstract
American Astronomical Society Meeting, 191, #129.04
Astronomy and Astrophysics
Astronomy
Scientific paper
Observational data show the presence of circumstellar gas-and-dust disks around T Tauri stars. There is no an evident dependence of disk parameters on the stellar age, while stars are younger than few million years. This implies that either disks grow during infall and then their evolution slows-down by order(s) of magnitude, or that the diversity of circumstellar disks is more significant than their evolutionary changes over this period of time. Discovery of giant planets at different distances from solar-type stars, especially those orbiting the stars at <= 0.1 AU, implies a large diversity of characteristics of planetary systems. This also might assume that protoplanetary disks might differ remarkably from the low-mass solar nebula preceded to our planetary system. Parameters of a protoplanetary disk are strongly dependent on the initial angular momentum of the protostellar cloud and an efficiency of the redistribution of the angular momentum in the disk during infall. In this paper, I consider a scenario of the formation of a single star with protoplanetary disk in protostellar clouds with different angular momenta, and the grain coagulation and planet formation in these disks. One of the conclusions of this paper is that disks originated from the collapse of slowly rotating cloud and having low level of turbulence might evolve to form massive planets in close to the star. A Jupiter-type planet in 51 Peg-type system might have been formed in a close proximity to the star.
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