Other
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt.........4t&link_type=abstract
Thesis (PhD). UNIVERSITY OF COLORADO AT BOULDER, Source DAI-B 61/04, p. 1993, Oct 2000, 169 pages.
Other
8
Scientific paper
This thesis examines observations and modeling of young circumstellar disks in the Orion nebula. Three separate arguments suggest that the disks are dominated by large particles, and we are witnessing earliest stages of planetary formation. (I)I used a Monte Carlo nine-parameter 3D disk model to fit Hubble Space Telescope observations in eleven bands from 0.2-1.9 μm. The best-fit models are consistent with extinction caused by large particles, r > λ in the outer disk edge. (II)Interferometric observations at 1.3 mm reveal no measurable flux from the disks, implying that the optical depth is low and thus particles have grown to r > 1 mm. (III)Numerical models of particle growth within a photoevaporative environment indicate that grain growth happens rapidly and predicts particle sizes similar to those constrained observationally. The model includes (a)grain growth in a turbulent disk, (b)ice loss by photosputtering, and (c)gas and dust loss by entrainment of small particles in a photoevaporative flow. The disks are photoevaporated on timescales of 104-6 yr by O stars in the Trapezium region. The numerical model indicates that formation of Jovian planets within the Orion region and other OB associations may be difficult; however, formation of terrestrial planets is not affected. I reproduce the observed sharp edge termination in the Orion disks. The existence of Jovian planets within our solar system suggests that our disk is not sharply terminated, and the Edgeworth-Kuiper belt may extend significantly beyond that presently detected. I apply a similar numerical model to evolution of Saturn's G ring, based on spectroscopic observations at the 1995-96 ring plane crossing, coupled with a light scattering model for realistic, processed small particles. Best-fit solutions indicate that the ring was formed by catastrophic disruption of a satellite 107-108 years ago and is sustained in steady-state by an unseen population of km-sized parent bodies.
No associations
LandOfFree
Light scattering and evolution of protoplanetary disks and planetary rings does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Light scattering and evolution of protoplanetary disks and planetary rings, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light scattering and evolution of protoplanetary disks and planetary rings will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1106967