Effects of Solid Disk Mass (Theory)

• Limited work available.
• Wetherill (1996):
  • Late-stage terrestrial planet formation with Jupiter and Saturn.
  • Used Monte-Carlo techniques.
  • Studied limited range of disk mass.
  • But, found a roughly linear relationship between planet mass and disk mass:
• Planets smaller than 0.2 are probably not habitable (Williams et al).
• Kokubo & Ida (2002):
  • Studied oligarchic growth only.
  • Tried to extrapolate and predict what their systems would look like.
  • Found in systems with a disk mass 5X Solar, terrestrial planets grow fast and big.
    • giant planets at 1AU.

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So, what will our TPF/Darwin see?
Theory: Get habitable planets only over a factor of 25 in disk mass.
Observations: Disk mass varies by a factor of 1500.
2% of G stars should have habitable terrestrial planets !!! TPF will look at ~150 stars.

This does not consider:

1. Role of giant planets - dynamical instability of giant planets.
2. If TPF/Darwin can see 0.2 planets.