Rapid growth of gas-giant cores by pebble accretion

  title={Rapid growth of gas-giant cores by pebble accretion},
  author={Michiel Lambrechts and Anders Johansen},
  journal={Astronomy and Astrophysics},
The observed lifetimes of gaseous protoplanetary discs place strong constraints on gas and ice giant formation in the core accretion scenario. The approximately 10-Earth-mass solid core responsible for the attraction of the gaseous envelope has to form before gas dissipation in the protoplanetary disc is completed within 1–10 million years. Building up the core by collisions between km-sized planetesimals fails to meet this timescale constraint, especially at wide stellar separations… Expand
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