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MIDI people _at_ MPIA
PIs Christoph Leinert (Project scientist) Uwe
Graser (Project manager) Markus Feldt Thomas
Henning Hendrik Linz Sascha P. Quanz Thorsten
Ratzka Veronica Roccatagliata Alexander
Schegerer Roy van Boekel Sebastian
Wolf Konrad Tristram Klaus Meisenheimer
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Spatially resolved science with MIDI
What you want to do
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MIDI visibilities in a nutshell (I)
A idealized Interferometer
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MIDI visibilities in a nutshell (II)
Lets think basic The Michelson Experient
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MIDI visibilities in a nutshell (III)
Lets think mathematical The van Cittert-Zernike
Theorem
some mathematics (or magic) occurs
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Take-aways The visibility is
(Two sides of the fringe)
1.)
Fcorrelated
(Correlated Flux)
V
Ftotal
(Total Flux or Spectrum)
V FT F (k,B)
(The Fourier Transform of the brightness
distribution)
van Cittert-Zernike Theorem
2.)
V 1
(Completely unresolved object point source)
Vlt 1
(Resolved objects extended source)
3.)
spatial information in 1 dimension!
a function of the wavelength (8-13 micron for
MIDI!)
depending on the (changing) projected baseline!
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Finally, an example
FU Orionis - Three baselines and Position
Angles (The FT point of view)

• We can constrain the geometry of the
  protoplanetary disk
• Inclination
• Position Angle

Quanz et al. 2006
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and another one
Dust evolution in disks around Herbig Ae/Be
stars (The Correlated Flux point of view)
Fcorrelated V Ftotal

• We can analyze the radial
• dependence of the dust
• composition in protoplanetary
• disks
• Grain growth
• Crystallization

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BACKUP
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Standard MIDI data products
What you get from Paranal