BEGIN:VCALENDAR
PRODID:-//University of Illinois//Web Services Calendar//EN
VERSION:2.0
CALSCALE:GREGORIAN
BEGIN:VEVENT
DTSTAMP:20120214T154636Z
DTSTART;TZID=America/Chicago:20120214T160000
DTEND;TZID=America/Chicago:20120214T160000
SUMMARY:Astrophysics Colloquium:  NO COLLOQUIUM TODAY
CREATED:20120207T150000Z
LAST-MODIFIED:20120207T150000Z
CATEGORIES:Colloquia
ORGANIZER:mmoconno@illinois.edu
URL:http://illinois.edu/calendar/detail/650?key=200001012000010115984893
UID:15984893@illinois.edu
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20120214T154636Z
DTSTART;TZID=America/Chicago:20120306T160000
DTEND;TZID=America/Chicago:20120306T160000
SUMMARY:Astrophysics Colloquium:   Adrienne Erickcek\, University of Toro
 nto
CREATED:20120105T150000Z
LAST-MODIFIED:20120105T150000Z
LOCATION:134 Astronomy
CATEGORIES:Colloquia
CONTACT:Charles Gammie 333-8646
ORGANIZER:gammie@illinois.edu
URL:http://illinois.edu/calendar/detail/650?key=200001012000010114507503
UID:14507503@illinois.edu
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20120214T154636Z
DTSTART;TZID=America/Chicago:20120315T160000
DTEND;TZID=America/Chicago:20120315T160000
SUMMARY:Astrophysics Colloquium:  Yoram Lithwick\, University of Toronto\
 , CITA:  " Secular Chaos: Formation of Hot Jupiters and the Organization
  of Planetary Systems"
CREATED:20120105T150000Z
DESCRIPTION:In a planetary system with well-spaced planets\, there is a n
 onlinear instability that can lead to chaotic behaviour.  One of the pla
 nets can gradually become unstable\, in which case its orbit becomes hig
 hly eccentric.  This "secular chaos" is known to be responsible for the 
 eventual destabilization of Mercury in our own Solar System.  Here I foc
 us on systems with multiple giant planets.  I show that after an extende
 d period of eccentricity diffusion\, the inner planet's pericentre can a
 pproach the star to within a few stellar radii. Strong tidal interaction
 s with the star then pull the planet inward\, creating a hot Jupiter.  I
 n contrast to other proposed channels for the production of hot Jupiters
 \, such a scenario (which I term "secular migration") explains a range o
 f observations: the pile-up of hot Jupiters at 3-day orbital periods\, t
 he fact that hot Jupiters are in general less massive than other RV plan
 ets\, that they may have misaligned inclinations with respect to stellar
  spin\, and that they have few easily detectable companions (but may hav
 e giant companions in distant orbits).I will also show that if an unstab
 le planet escapes the influence of the other planets\, the remaining pla
 netary system becomes  increasingly  stable.  This may explain the stabl
 e architecture of observed systems.
LAST-MODIFIED:20120209T150000Z
LOCATION:134 Astronomy
CATEGORIES:Colloquia
CONTACT:Charles Gammie 333-8646
ORGANIZER:gammie@illinois.edu
URL:http://illinois.edu/calendar/detail/650?key=200001012000010114507504
UID:14507504@illinois.edu
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20120214T154636Z
DTSTART;TZID=America/Chicago:20120327T160000
DTEND;TZID=America/Chicago:20120327T160000
SUMMARY:Astrophysics Colloquium:  Julie Comerford\, University of Texas-A
 ustin
CREATED:20120105T150000Z
LAST-MODIFIED:20120105T150000Z
LOCATION:134 Astronomy
CATEGORIES:Colloquia
CONTACT:Charles Gammie 333-8646
ORGANIZER:gammie@ilinois.edu
URL:http://illinois.edu/calendar/detail/650?key=200001012000010114507505
UID:14507505@illinois.edu
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20120214T154636Z
DTSTART;TZID=America/Chicago:20120403T160000
DTEND;TZID=America/Chicago:20120403T160000
SUMMARY:Astrophysics Colloquium:  Stella Offner\, Harvard-Smithsonian Cen
 ter
CREATED:20120105T150000Z
LAST-MODIFIED:20120105T150000Z
LOCATION:134 Astronomy
CATEGORIES:Colloquia
CONTACT:Charles Gammie 333-8646
ORGANIZER:gammie@illinois.edu
URL:http://illinois.edu/calendar/detail/650?key=200001012000010114507506
UID:14507506@illinois.edu
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20120214T154636Z
DTSTART;TZID=America/Chicago:20120410T160000
DTEND;TZID=America/Chicago:20120410T160000
SUMMARY:Astrophysics Colloquium:  Alyson Brooks\, University of Wisconsin
 -Madison
CREATED:20120105T150000Z
LAST-MODIFIED:20120105T150000Z
LOCATION:134 Astronomy
CATEGORIES:Colloquia
CONTACT:Charles Gammie 333-8646
ORGANIZER:gammie@illinois.edu
URL:http://illinois.edu/calendar/detail/650?key=200001012000010114507507
UID:14507507@illinois.edu
END:VEVENT
END:VCALENDAR