Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...195..183m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 195, no. 1-2, April 1988, p. 183-192.
Astronomy and Astrophysics
Astrophysics
74
Accretion Disks, Cosmic Dust, Cosmology, Particle Size Distribution, Protoplanets, Turbulence Effects, Angular Momentum, Extrasolar Planets, Laminar Flow, Nebulae, Planetary Evolution, Solar System, Spectrum Analysis
Scientific paper
The process of coagulation of dust grains in spatially uniform turbulent gas, where at the low mass end of the grain size spectrum small interstellar grains are assumed to be added continuously, was studied. The turbulence-induced collision velocity between two grains was calculated including a finite inner scale of the turbulence, and the asymptotic mass spectrum and dust opacity were obtained. These calculations were applied to the case of a rotating protostellar nebula, where the central object accretes mass through a turbulent accretion disk, which in turn is fed by material from an extended collapsing outer envelope. It is shown that the grain opacity initially increases with time, keeping the disk convectively turbulent; later on, even though the disk is fed by small particles, convective instability ceases due to the decrease of the opacity on account of grain growth. During the following quiet episode, the freshly added interstellar grains can increase the disk opacity again until convection restarts. It is shown that planetesimal formation might be possible through sedimentation during the laminar phases.
Markiewicz Wojciech J.
Mizuno Hideki
Voelk Heinrich J.
No associations
LandOfFree
Grain growth in turbulent protoplanetary accretion disks 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 Grain growth in turbulent protoplanetary accretion disks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Grain growth in turbulent protoplanetary accretion disks will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-847461