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SUMMARY:Stellar spin-orbit angle in planetary systems - Gwenaël Boué (IM
 CCE - Observatoire de Paris)
DTSTART:20151026T160000Z
DTEND:20151026T170000Z
UID:TALK60332@talks.cam.ac.uk
CONTACT:Jean Teyssandier
DESCRIPTION:The first exoplanets detected around solar-type stars were mos
 tly hot Jupiters.\nThese observations were puzzling because such planets c
 annot form so close to their star. It has thus been proposed that these pl
 anets get born much further out\nand then migrate inward by interaction wi
 th the protoplanetary disk. A second revolution happened when observations
  showed that several of the hot Jupiters were on highly inclined orbits wi
 th respect to the equatorial plane of their stars. A series of alternative
  scenarios to the disk migration has then been proposed\, most of them inv
 olving high eccentricity excitations.\nIn this talk\, I will review the di
 fferent migration scenarios and tilting processes. I will then focus on mu
 ltiplanet systems for which the high eccentricity migration scenario is ex
 cluded. In particular\, I will discuss their secular evolution when they a
 re perturbed by an inclined stellar companion as in the case of the 55 Can
 cri planet system. I will also describe the geometrical structure hidden b
 eneath this interesting problem. \n
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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