3:30 PM - 3:45 PM
[PPS07-12] Co-Accretion of Chondrules and Fluffy Matrices
Keywords:Rocky planetesimal, Chondrule
Chondrules are the principal components of the most common meteorites, chondrites. This facts may mean that rocky planetesimals in our solar system are formed via accretion of chondrules. However, it is not yet understood how chondrules grow into planetesimals.
Several pieces of meteoritical evidence suggest that chondrites contained abundant nanograins in their matrices. These nanograins must play a key role for growth of dust aggregates. Therefore we examined a scenario in which rocky pkanetesimals are formed via co-accretion of chondrules and fluffy aggregates of nanograins.
Though our scenario succeeded in forming rocky planetesimals, we also found a new problem for "chondritic" planetesimal formation. If the mass fraction of chondrules is not hight enough, and the density of matrices is too low to stop chondules when dust aggregates collide, then the retainment of chondrules in fluffy matrices is nontrivial. Future work on this point is needed.
Several pieces of meteoritical evidence suggest that chondrites contained abundant nanograins in their matrices. These nanograins must play a key role for growth of dust aggregates. Therefore we examined a scenario in which rocky pkanetesimals are formed via co-accretion of chondrules and fluffy aggregates of nanograins.
Though our scenario succeeded in forming rocky planetesimals, we also found a new problem for "chondritic" planetesimal formation. If the mass fraction of chondrules is not hight enough, and the density of matrices is too low to stop chondules when dust aggregates collide, then the retainment of chondrules in fluffy matrices is nontrivial. Future work on this point is needed.