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SUMMARY:Eccentric planets &amp\; Debris disks Interactions: Mean-motion re
 sonances\, Exocomets\, and Exozodis - Virginie Faramaz (IA-PUC Santiago)
DTSTART:20170607T150000Z
DTEND:20170607T160000Z
UID:TALK72245@talks.cam.ac.uk
CONTACT:Ed Gillen
DESCRIPTION:In this talk\, I will present how resonant interactions betwee
 n moderately eccentric planets and debris disks can indirectly lead to the
  production of active comets. The characteristics of this production (rate
 s\, timescales) were investigated thanks to a combination of analytical pr
 edictions and complementary numerical N-body simulations. This mechanism c
 an lead to the production of active comets with delays of the order of sev
 eral 100 Myr and can sustain continuous production of active comets over G
 yr-timescales once it has started. \nThis is extremely interesting in the 
 context of the formation of analogues to the Solar System Zodiacal Cloud\,
  made of short-lived hot dust residing in the immediate vicinity of a star
 . These have been detected around many stars\, and in particular old ones 
 (> 100 Myr). A promising scenario is that exozodis are refilled in situ th
 rough cometary activity and sublimation. As the reservoir of comets is not
  expected to be replenished\, their presence in old systems has yet to be 
 adequately explained.\nGiven the characteristic timescales involved\, mean
 -motion resonances with eccentric planets appear then to be an excellente 
 candidate mechanism to explain the presence of exozodis around old stars. 
 It is\, in addition\, a robust process which operates for a large range of
  planetary parameters\, and through which low mass disks comparable to the
  Kuiper Belt could sustain comet scattering at rates compatible with the r
 eplenishement of the detected exozodis.
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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