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SUMMARY:Zooming in on the planet-forming zones of disks: Sweet results fro
 m ALMA - Ewine van Dishoeck (Leiden University)
DTSTART:20131008T153000Z
DTEND:20131008T163000Z
UID:TALK47567@talks.cam.ac.uk
CONTACT:David Titterington
DESCRIPTION:Protoplanetary disks are the birthplaces of plants\, but the s
 patial resolution at long wavelengths has so far been insufficient to reso
 lve the critical 5-30 AU region where they are formed.  ALMA now allows us
  to zoom in to nearby disks and probe the physical and chemical structure 
 associated with planet formation.  In this talk\, an overview of recent wo
 rk by our group and colleagues on observations and models of protoplanetar
 y disks around young stars in various stages of evolution will be presente
 d.  Early ALMA results include evidence for rotationally supported disks i
 n the deeply embedded stage\, the detection of organic molecules (includin
 g sugar) and water in forming disks\, and the first images of the CO snowl
 ine in mature disks.  The ALMA data are complemented by VLT-CRIRES\, Spitz
 er and Herschel observations\, which reveal new processes in the inner few
  AU of disks.\n   Special attention will be given to transitional disks\, 
 which are a subset of disks with evidence for sharp-rimmed cavities (gaps 
 or holes) in their inner part but with otherwise normal outer disks.  Thes
 e disks are called ‘transitional’ because they are thought to represen
 t the evolutionary phase from the gas-rich protoplanetary disk to the gas-
 poor debris disk stage.  They are the best candidate sources for harbourin
 g young giant planets or where planet formation is currently taking place.
   The surprising results of our ALMA Cycle 0 program on the discovery of a
  huge dust trap (a ‘planetesimal or Kuiper-Belt factory’) in one parti
 cular transitional disk will be presented.\n
LOCATION:Sackler Lecture Theatre\, IoA (tea at 4.00 pm)
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