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SUMMARY:Formation\, survival\, and detectability of planets beyond 100AU -
  Veras\, D (Florida)
DTSTART:20091111T122000Z
DTEND:20091111T124000Z
UID:TALK21413@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Direct imaging searches have begun to detect planetary and bro
 wn dwarf companions and to place constraints on the presence of giant plan
 ets at large separations from their host star. This work helps to motivate
  such planet searches by predicting a population of young giant planets th
 at could be detectable by direct imaging campaigns. Both the classical cor
 e accretion and the gravitational instability model for planet formation a
 re hard-pressed to form long-period planets *in situ*. Here\, we show that
  dynamical instabilities among planetary systems that originally formed mu
 ltiple giant planets much closer to the host star could produce a populati
 on of giant planets at large (~100 AU -- 100000 AU) separations. We estima
 te the limits within which these planets may survive\, quantify the effici
 ency of gravitational scattering into both stable and unstable wide orbits
 \, and demonstrate that population analyses must take into account the age
  of the system. We predict that planet scattering creates detectable giant
  planets on wide orbits that decrease in number on timescales of ~10 Myr. 
 We demonstrate that several members of such populations should be detectab
 le with current technology\, quantify the prospects for future instruments
 \, and suggest how they could place interesting constraints on planet form
 ation models.
LOCATION:Satellite
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