Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics
Scientific paper
2010-12-09
The Astrophysical Journal Letters, Volume 727, Issue 1, article id. L5 (2011)
Astronomy and Astrophysics
Astrophysics
Earth and Planetary Astrophysics
13 pages, 3 figures, accepted for publication in ApJ Letters
Scientific paper
10.1088/0004-637X/727/1/L5
The large number of exoplanets found to orbit their host stars in very close orbits have significantly advanced our understanding of the planetary formation process. It is now widely accepted that such short-period planets cannot have formed {\em in situ}, but rather must have migrated to their current orbits from a formation location much farther from their host star. In the late stages of planetary formation, once the gas in the proto-planetary disk has dissipated and migration has halted, gas-giants orbiting in the inner disk regions will excite planetesimals and planetary embryos, resulting in an increased rate of orbital crossings and large impacts. We present the results of dynamical simulations for planetesimal evolution in this later stage of planet formation. We find that a mechanism is revealed by which the collision-merger of planetary embryos can kick terrestrial planets directly into orbits extremely close to their parent stars.
Ji Jianghui
Jin Sheng
Tinney Chris G.
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