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Outer-Edge of the Inner Hole -Nursery of Planets-  Masahiro 
  • hiro,
  • Suzuka Amaya
Suzuka Amaya
Suzuka Amaya


Planets are recently revealed to be very common objects in the Universe. However, the standard theory of their formation encounters many difficulties, such as dust fall and disk lifetime problems. We positively analyze them, expecting that problems as a whole may indicate some consistent effective model. We propose a dynamical model of the planet formation based on the assumption that the inner hole is rapidly formed in the disk by the photoevaporation or equivalent. The basic steps are dust fall, accumulation, and slingshots. The dust in the protoplanetary disk rapidly falls as it grows to the meter size. However, it stops at the outer edge of the hole where the gas friction disappears. Such dense blobs rapidly coalesce w.e.o in the near orbit until few huge bodies finally dominate. Then these bodies are blown towards inner and outer regions by the slingshot. We found that the former forms Rockey-Planets or Hot-Jupiters, depending on the eccentricity of their orbits. The latter forms Cold-Gas-Giants or Ice-Giants, depending on the distance blown. Combining the numerical calculations of slingshots and coagulation equations, we obtain the planet population diagram, including the possibility of stray planets and the off-plane planets.