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Modeling the structure, chemistry and appearance of protoplanetary disks

Modeling the structure, chemistry and appearance of protoplanetary disks. Ringberg, Germany, april 2004. Disk structure and SEDs Dust properties Planet formation Disk/planet interaction Hydrodynamics. Transport processes Evaporation Gas physics Observations And many more…. Many topics.

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Modeling the structure, chemistry and appearance of protoplanetary disks

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  1. Modeling the structure, chemistry and appearance of protoplanetary disks Ringberg, Germany, april 2004

  2. Disk structure and SEDs Dust properties Planet formation Disk/planet interaction Hydrodynamics Transport processes Evaporation Gas physics Observations And many more… Many topics

  3. PDRs in disks  • Advantages: • Seek comfort and security in the big cozy PDR community • Disk surfaces resemble PDRs • Well understood physics and chemistry

  4. PDRs in disks  • Drawbacks: • PDRs are 1-D, disks 2-D • How well do disks resemble the ISM? • Turbulent mixing • Dust physics

  5. Dust in disks • There are NOfluffy grains! (C. Dominik) • They are porous (ma3) • Or fractal (mad, d<3) • Grain growth is slow, sometimes too slow • Electrostatic forces between charged grains can speed up the process • Aerodynamics may prevent shattering of porous grains

  6. Dust evolution • How does the disk evolve observationally? • Amorphous → crystalline, or • Crystalline → amorphous • More processing in inner disk • Radial mixing can be very efficient

  7. Mixing • Exact mechanism unknown; possible candidates are: • Magneto-rotational instability • Self gravity (only in very massive disks) • Baroclinic instability (Hubert Klahr) • Direction of radial mixing is uncertain (in near the midplane, out at the surface or vice versa?)

  8. More mixing • Both radial and vertical mixing are very important for the chemistry • Hydro people: α-description incorrect to describe turbulence, mixing • Worse: angular momentum transfer α ≠ turbulent mixing α • What to do?

  9. That’s (not quite) all • See http://www.mpia.de/PSF/WorkshopRingbergApril04 for workshop summary and ppt files

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