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The Birth of Giants – Bottom Up or Top Down?

The Birth of Giants – Bottom Up or Top Down?

Bottom

Bottom Up (Harris 1978; Mizuno et al 1978) • Rocky cores form in the nebula • They act as seeds, attract massive atmospheres supported by luminosity due to planetesimal accretion • When core instability sets in, planet attains lots of gas Top Down (Cameron 1978; Boss1998) Mayer et al. 2002 • Massive gaseous disk undergoes gravitational instability – no seed needed • It fragments into bound, self-gravitating objects • Objects collapse eventually becoming giant planets

Gravitational Instability Top Down: Gravitational Instability

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