Asteroid Belt Formation and the Origin of Earth's Water (cont)
But it now looks like the asteroid belt never contained objects as massive as an embryo.
- The asteroid belt needed to be very massive for
embryos to form.
- But this is inconsistent with the survivability of Vesta
and small basaltic asteroids.
- There could not have been a lot of mass after 3 Myr.
- But the model requires water to be delivered > 10 Myr.
- Embryos did not excite the asteroid belt.
- The eccentricity distribution is too smooth.
- It predicts a thermalized ratio of e and sin(i) of ~2, which is not observed.