I plan to submit the following abstract for the "In the Spirit of  
Bernard Lyot" meeting in Berkely (June 4-8).  Please, let me know if  
you have any comments.

Best,
Stan

Multi-Wavelength Modeling of the Resolved Emission from the Debris
Disk around HD 107146

The debris disk around HD 107146 offers an important opportunity to
explore the morphology and physical properties of second-generation
circumstellar dust disks because of its unique combination of near
face-on viewing geometry and availability of resolved maps of the
circumstellar emission over a large number of regions of the
electromagnetic spectrum.  The disk is resolved from the optical and
near-infrared, where it is imaged coronagraphically in scattered light,
to the far-infrared, sub-millimeter, and millimeter, where it is seen in
thermal emission.  The coronagraphic observations, in particular, place
strong constraints on the radial and azimuthal distribution of the
circmstellar dust, and on its scattering properties.  We present a
unified description of the HD 107146 debris disk based on a radiative
transfer model that incorporates the multi-wavelength resolved emission,
spectral energy distribution, and 8-36 micron Spitzer/IRS spectrum of
the star.  Our model presents a self-consistent picture of the physical
properties of the dust grains (size distribution, composition) and the
overall morphology of the disk (inner and outer radii, density
distribution).  In particular, our constraint on the inner disk radius
puts a stringent upper limit on the semi-major axis of any potential
giant planet that may be orbiting around HD 107146 and truncating its
inner disk.