BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Effects of Dynamical Evolution of Giant Planets on Survival of Ter
 restrial Planets - Dr. Soko Matsumura (University of Dundee)
DTSTART:20140602T150000Z
DTEND:20140602T160000Z
UID:TALK50775@talks.cam.ac.uk
CONTACT:Adrian Barker
DESCRIPTION:The orbital distributions of currently observed extrasolar gia
 nt planets allow marginally stable orbits for hypothetical\, terrestrial p
 lanets.  However\, many of these giant planets have eccentric orbits that 
 indicate dynamical instability in the past.  If this is the case\, many su
 ch systems may not have additional planets on the "stable" orbits\, since 
 past dynamical evolution could have removed them. We numerically test this
  hypothesis by simulating the effects of early evolution of multiple giant
  planets on the orbital stability of the inner\, sub-Neptune-like planets.
   We find that secular perturbations from giant planets can remove test pa
 rticles at least down to 10 times smaller than their minimum pericenter di
 stance. Our results indicate that\, unless the dynamical instability among
  giant planets is either absent or quiet like planet-planet collisions\, m
 ost test particles down to ~0.1 AU within the orbits of giant planets at a
  few AU may be gone. We find a good agreement between our numerical result
 s and the secular theory as well as with the observations.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
END:VEVENT
END:VCALENDAR