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SUMMARY:Hot Jupiters with Companions: Results of the Long-term CORALIE Sur
 vey - Marion Neveu-VanMalle (Cavendish)
DTSTART:20160203T160000Z
DTEND:20160203T170000Z
UID:TALK63952@talks.cam.ac.uk
CONTACT:Dr B.-O. Demory
DESCRIPTION:For twenty years hot Jupiters have been challenging planet for
 mation theories. While in-situ formation has rapidly been rejected\, the g
 iant planets migration mechanisms are still not well understood. Disc migr
 ation is probably the dominant scenario but it cannot explain the observed
  population of hot Jupiters. Dynamical models involving the influence of a
 n additional planetary or stellar companion through scattering or Kozai-Li
 dov mechanisms could also explain planetary migration. Their role needs to
  be characterised. High eccentricity migration mechanisms are triggered by
  the presence of an additional object. Knutson et al. (2014) searched for 
 planetary companions to hot Jupiters and deduced that half of them had a g
 iant planetary companion. We have performed our own independent search for
  companions of hot Jupiters. Since 2007\, we have monitored the Southern W
 ASP confirmed planets with the high-resolution echelle spectrograph CORALI
 E. Our sample includes more than 100 targets\, including 90 that have been
  followed for more than three years. Our results slightly differ from thos
 e of Knutson et al. (2014). I will present the results of this survey rega
 rding the statistics of companions of hot Jupiters. I will compare our det
 ections with the planetary occurrence rates as well as with the binary sta
 rs occurrence rates. I will describe the correlations between the presence
  of a companion and the properties of the hot Jupiter.
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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