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DTSTAMP:20260415T181611
DTSTART:20140403T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/407703
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Glimpsing the Compositions of Sub-Neptune-Size Exoplanets
DESCRIPTION:Conférence de Leslie Rogers\, CaltechRésuméSub-Neptune and s
 uper-Earth sized planets are a new planet category. They account for 80% o
 f the planet candidates discovered by Kepler\, and 0% of the planets in th
 e Solar System. What is the nature of these sub-Neptune-size planets\, how
  did they form\, and why are they so numerous? I will review some of the h
 ighlights from the complement of exotic sub-Neptune-size planets discovere
 d to date and present an updated planet mass-radius diagram\, including ne
 w Keck radial velocity mass constraints for 42 small Kepler transiting pla
 net candidates. From the observed planet mass-radius distribution\, I’ll
  theorize about why parts of the distribution are unpopulated and about wh
 ether this could be a signature of planet formation and evolution. I’ll 
 focus on the intriguing transition between rocky exoplanets (comprised of 
 iron and silicates) and planets with voluminous layers of volatiles (H/He 
 or astrophysical ices)\, and explore how the current census of planets con
 strains this transition. Applying a hierarchical Bayesian model\, I will s
 how that the majority of 1.6 Earth-radii planets are not rocky.Présentée
  par le Groupe Astronomie et astrophysique du Département de physique de
  l'Université de Montréal. Cette conférence est destinée à des spéci
 alistes dans le domaine de l'astrophysique et sera donnée en anglais.
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