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SUMMARY:Spitzer tracers of dynamical activity in debris discs - Rieke\, G 
 (Arizona)
DTSTART:20090821T084000Z
DTEND:20090821T090000Z
UID:TALK19508@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:I will review the patterns of dynamical activity in debris dis
 ks as they are revealed by observations with the Spitzer Telescope. The Sp
 itzer data show an overall decline in such activity among all stellar type
 s\, but recent detailed analyses reveal significant differences with stell
 ar type. They also suggest that the disks around earlier-type host stars m
 ay have a general pattern of relatively complex structure\, whereas those 
 around solar-type stars may have simpler structures. On top of these overa
 ll patterns\, there are a number of classes of rare but extreme systems: 1
 .) an absence of disks around young stars with very high stellar winds\; 2
 .) huge excesses around stars in the 30  120 Myr age range\; and 3.) large
  outflows in A stars. Each of these classes represents interesting phases 
 in the overall evolution of the planetary systems generating the disks. 
LOCATION:Seminar Room 1 Newton Institute
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