Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20912201s&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #122.01; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
Discovery of extrasolar planets and disks around young stars as well as of objects in the outskirts of our own solar system have dramatically changed our view of planets and their formation. Given constraints from these observations, we describe a scenario for the formation of our own solar system. We argue that the number of planets we see today was set by stability criteria. More objects than seen today formed very quickly. In the outer solar system, where the binding to the Sun is weak, Neptune-size objects were ejected while in the inner solar system mergers occurred via giant impacts. Following this phase of planet formation the objects had significant eccentricities and inclinations. The current circular and coplanar orbits were established later, by dynamical friction on residual small bodies. We provide a timeline for these stages of planet formation and discuss a possible origin of the planetary spins.
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