Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dda....38.1504s&link_type=abstract
American Astronomical Society, DDA meeting #38, #15.04
Astronomy and Astrophysics
Astronomy
Scientific paper
About one fifth of the planetary population known to us today resides in multiple stellar systems, including a few which are compact stellar systems. The question arises as to whether such planets form in situ or whether dynamical encounters are responsible for such configurations. Looking into the present configuration and the dynamical history of compact stellar systems with planets can help us answer this question. A first step in this direction would be to investigate the ability of tight multiple stellar systems to maintain planets on stable orbits. In this paper, we numerically investigate the stability of a tight binary system with one and with two planets. We choose as a base for our investigation the most compact stellar system with evidence of a giant planet, HD188753. This system is specially interesting since the formation of a giant planet in situ seems to be impossible because of the closeness of the stellar companion, and since its presence has recently been observationally challenged (Eggenberger et al. 2007). We seek here to shed light on the possibilities of planets surviving on stable orbits in such compact environments. We discuss the possibilities for the Hot Jupiter and for a second planet. We find that this system can maintain an additional planet on a wider orbit only in the case of low relative inclinations between the orbits of the planet and the companion. At inclinations above the Kozai limit, strong eccentricity oscillations are induced which eventually lead to an ejection or a collision with the Hot Jupiter.
Rasio Fred
Saleh Lamya A.
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