Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..421p&link_type=abstract
SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.
Astronomy and Astrophysics
Astrophysics
Scientific paper
Many planets have now been found in binary systems. Here, we study some aspects of planet formation in binary systems and focus on type I migration in circumbinary discs. In order to investigate the evolution of a low-mass planet embedded in a circumbinary disc, we have performed 2D hydrodynamical simulations. Our results suggest that the stability of a planet depends strongly on the planet mass and on the binary eccentricity. For example, a 50 M⊕ planet is stable as long as ebin ≤ 0.2 whereas we find that a 10 M⊕ planet is ejected if ebin ≥ 0.1. For low binary eccentricities, it appears that the system can achieve a state of secular resonance where the apsidal lines of the planet and of the binary are aligned, preventing the planet from close encounters with the binary. For high binary eccentricities, secular resonance is not achieved and close encounters are possible, leading to the ejection from the system.
Nelson Randy
Pierens Arnaud
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