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Titre du Document
A dynamical analysis of the HD 37124 planetary system
Auteur(s)
GOZDZIEWSKI K.
Résumé
In this paper we study the stability of the HD 37124 planetary system. Using initial conditions found by Butler et al. (2002) we estimate the dynamical bounds on orbital parameters that provide stable (quasi-periodic) motions of the system. The stability analysis has been performed with the help of the MEGNO technique. This method, invented by Cineotta & SimÓ (2000), makes it possible to distinguish efficiently between chaotic and regular dynamics of a dynamical system. The MEGNO analysis helps us to confirm the result of Butler et al. (2002) who found that the critical factor for system stability is the eccentricity of the outer planet. This parameter is not well constrained by the current set of observations. For coplanar configurations, the limiting value of the eccentricity, providing quasi-periodic motion of the system, is roughly equal to 0.55. This value is typically slightly smaller when the system inclination increases (and companions' masses grow) but for i ≃ 25° it can be as low as 0.25. The system is located in a wide stable zone in the plane of eccentricities. The dynamics are insensitive to the initial phases of the planets. If the eccentricity of the outer planet is close to the current fit value ≃0.4, then the system is regular over wide ranges of the relative inclination of the planets. We analyze whether a telluric planet can survive orbitally in the habitable zone of the system. This zone is covered by the investigated region of semi-major axes betwee
Editeur
EDP Sciences
Identifiant
ISSN : 0004-6361 CODEN : AAEJAF
Source
Astronomy and astrophysics (Berlin. Print) A. 2003, vol. 398, n° 1, pp. 315-325 [11 pages]
Langue
Anglais
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