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PRODID:https://murmitoyen.com/events/vanille/udem/
X-WR-TIMEZONE:America/Montreal
BEGIN:VEVENT
UID:69d9bf930c09a
DTSTAMP:20260410T232715
DTSTART:20161201T113000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20161201T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/733805-constraining-g
 iant-exoplanet-formation-and-migration-with-direct-imaging-surveys-henry-n
 go-caltech
LOCATION:Pavillon Roger-Gaudry \, 2900\, boul. Édouard-Montpetit\, Local M
 -415\, Montréal\, QC\, Canada
SUMMARY:Constraining giant exoplanet formation and migration with direct im
 aging surveys - Henry Ngo (Caltech)
DESCRIPTION:Constraining giant exoplanet formation and migration with direc
 t imaging surveys - Henry Ngo (Caltech)
Résumé
Over the past two decades
 \, planet finding surveys have found gas giant exoplanets on orbital separ
 ations spanning more than four orders of magnitudes. The giant planets wit
 h the smallest semi-major axes were the first planets detected via radial 
 velocity and transit surveys. Known as 'hot Jupiters'\, these giant planet
 s can have orbital semi-major axes as low as 0.01 AU. At the other extreme
 \, recent direct imaging discoveries revealed giant planets beyond their s
 ystem ice lines\, with separations as large as hundreds of AU. However\, i
 t is not known whether these two groups of extreme giant planets formed in
  situ or if they instead formed at moderate distances and then migrated to
  their current locations. I will present two direct imaging surveys to exp
 lore the origins and to characterize the population of these extreme gas g
 iant planets. The first survey focuses on the influence of stellar compani
 ons on hot Jupiter formation and migration. Our work shows that stellar co
 mpanions are unlikely affect hot Jupiter migration but they may have an im
 portant role in giant planet formation. The second study searches for dire
 ctly imaged giant planets near their system ice lines. We will compare our
  imaged giant population with the radial velocity detected giant planets t
 o compare formation mechanisms. We are able to access these small separati
 ons for the first time using the new vortex coronagraph recently installed
  on Keck/NIRC2.
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TZID:America/Montreal
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