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SUMMARY:Submm observations of protoplanetary disks - Wilner\, D (Harvard S
 mithsonian Center )
DTSTART:20090817T103000Z
DTEND:20090817T105000Z
UID:TALK19470@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Observations over a wide wavelength range provide diagnostic i
 nformation on protoplanetary disks\, but the submillimeter regime is espec
 ially important because (1) optically thin dust emission probes particles 
 through the entire disk\, including the cold midplane\, (2) these are the 
 longest wavelengths where dust is readily detectable\, and therefore the l
 ast direct link on the chain of sizes from sub-micron interstellar particl
 es to planetesimals\, (3) aligned dust particles can produce polarized emi
 ssion that traces the magnetic field\, and (4) spectral line emission from
  a variety of species show the detailed disk kinematics and constrain nebu
 lar chemistry. I will describe recent results from the Submillimeter Array
  that take advantage of several of these key features\, with implications 
 for disk structure\, planet forming potential\, and the physics of accreti
 on. In particular\, I will discuss a high resolution (0.3 arcsec = 40 AU) 
 870 micron survey of dust continuum emission from young disks in the Ophiu
 chus star-forming region\, where we have used 2D radiative transfer calcul
 ations to fit simultaneously the resolved submillimeter data and the broad
 band spectral energy distributions with a parametric model in an effort to
  characterize the viscous properties and the likelihood of future (and per
 haps even past) planet formation in these disks. 
LOCATION:Seminar Room 1 Newton Institute
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