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SUMMARY:Resolved debris disks around young main sequence stars eta Tel and
  HR4796A: tracing planets in the dust - Churcher\, L (Cambridge)
DTSTART:20091109T124000Z
DTEND:20091109T130000Z
UID:TALK21393@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Circumstellar dust exists in disks around hundreds of main seq
 uence stars. These stars show significant excess emission in the mid-infra
 red\, several million years after the proto-planetary disk is thought to h
 ave dispersed. As the lifetime of small dust around these stars is short i
 t must be continually replenished through collisions between larger planet
 esimal\, analogous to the bodies in the Solar System's Asteroid and Kuiper
  belts. These dust disks are known as debris disks. Here we present resolv
 ed mid-infrared imaging with Gemini instruments TReCS and MICHELLE of the 
 debris disks of two young main sequence stars: Eta Tel (A0V ~10Myr) and HR
 4796A (A0V ~12Myr) and consider the implications for the state of planet f
 ormation in these systems. Modelling of the Eta Tel system indicates that 
 the extension arises from an edge-on disk of radius ~24AU\, but that >50% 
 of the 18um emission comes from an unresolved dust component at ~4AU\, a r
 adial structure reminiscent of the asteroid and Kuiper belts in the Solar 
 System. However\, both the radius and dust level of the extended cooler co
 mponent is also consistent with self-stirring models in which case the hot
  dust component may arise in massive collisions due to ongoing terrestrial
  planet formation. 
LOCATION:Satellite
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