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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20141202T103000
DTEND;TZID=Atlantic/Canary:20141202T113000
UID:iactalks-737
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/737
CREATED:2014-12-02T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:The exo-planet obliquity as a fingerprint of planetary formation an
 d evolution
DESCRIPTION:The exo-planet obliquity as a fingerprint of planetary formatio
 n and evolution\nProf. Tsevi Mazeh\n\nThe angle between the stellar spin a
 xis and the  orbital planetary angular momentum of a planet, also referred
  to as the  obliquity of the system, is a matter of intense study in recen
 t years,  for the transiting planets of the Kepler mission in particular. 
 Some  evidence was found for two populations of hot Jupiters - one around 
 cool  stars with orbits well-aligned with the stellar rotational axes, and
   the other one around hot stars with isotropic distribution of  obliquiti
 es, including planets with retrograde motion. It was suggested  that the p
 rimordial planetary obliquity is isotropic, and cool stars  have reached t
 heir zero-obliquity state by tidal re-alignment.\nThe talk will summarize 
 the observational techniques  for measuring planetary obliquities, and the
  different theoretical  approaches to interpret this new, unexpected featu
 re of exo-planet  population. Finally, I will present a surprising statist
 ical new result  that emerges from the study of Kepler light curves of ste
 llar rotation,  suggesting the alignment of cool stars is probably not the
  result of  tidal interaction.
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