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SUMMARY:Long-lived N-body disks - Tremaine\, S (Princeton)
DTSTART:20091110T140000Z
DTEND:20091110T145000Z
UID:TALK21410@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Many of the same physical processes drive the evolution of cir
 cumstellar discs composed of dust grains\, asteroids\, planetesimals\, pla
 nets\, etc. This talk investigates the survival of such discs over Gyr tim
 escales\, using a unified approach that is applicable to all Keplerian dis
 cs of solid bodies. Monodisperse discs can be characterized locally by fou
 r parameters: surface density\, semi-major axis\, velocity dispersion\, an
 d size of the bodies. For a given set of these parameters\, the disc must 
 survive all dynamical processes\, including gravitational instability\, dy
 namical chaos\, gravitational scattering\, physical collisions\, and radia
 tion forces\, that would lead to significant evolution over its lifetime. 
 These processes lead to a rich set of constraints that strongly restrict t
 he possible properties of long-lived discs. Within this framework\, I also
  discuss the detection of planetesimal discs using radial velocity measure
 ments\, transits\, microlensing\, and the infrared emission from the plane
 tesimals themselves or from dust generated by planetesimal collisions. A w
 ide range of long-lived discs would not have been detected by present tech
 niques.
LOCATION:Satellite
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