Disk Accretion Phase: Ubiquity

• 100% for stars with M < 1 MO (observed)

• 100% for higher mass stars (inferred)

  • Collimated jets
  • Evidence for ëfunnel flowsí
  • Rotational properties

    • J/M vs M is continuous
  • Accretion through disks enables assembly

    • Radiation pressure would otherwise reverse accretion

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