On Collective Behavior in a Planetesimal Disk.

Details On Collective Behavior in a Planetesimal Disk. On Collective Behavior in a Planetesimal Disk.

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dda....31.0103w&link_type=abstract

American Astronomical Society, DDA Meeting #31, #01.03; Bulletin of the American Astronomical Society, Vol. 32, p.856

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Recently there has been a renewed interest in the stability of a planetesimal disk against forms of collective particle behavior. For some time, it has been argued that gravitational instability is suppressed by turbulence at the gas-particle interface, which excites particle dispersion velocities and maintains the disk's Q above unity. However, the presence of a gas phase also introduces other modes of collective behavior by allowing the exchange of angular momentum with the gas reservior. These include both gravitational and non-gravitational modes, and can operate over longer wavelengths than the usual dynamic instabilities. We discuss the possibility that such long wavelength instabilites could decrease Q in regions of the disk, thereby triggering the onset of dynamic modes.

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