Dynamics and Eccentricity Formation of Planets in OGLE-06-109L System - Astrophysics > Earth and Planetary AstrophysicsReportar como inadecuado




Dynamics and Eccentricity Formation of Planets in OGLE-06-109L System - Astrophysics > Earth and Planetary Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: Recent observation of microlensing technique reveals two giant planets at 2.3AU and 4.6 AU around the star OGLE-06-109L. The eccentricity of the outerplanet ec is estimated to be 0.11+0.17,-0.04, comparable to that of Saturn0.01-0.09. The similarities between the OGLE-06-109L system and the solarsystem indicate that they may have passed through similar histories duringtheir formation stage. In this paper we investigate the dynamics and formationof the orbital architecture in the OGLE-06-109L system. For the present twoplanets with their nominal locations, the secular motions are stable as long astheir eccentricities eb; ec fulfill eb^2 + ec^2 < = 0.3^2. Earth-size bodiesmight be formed and are stable in the habitable zone 0.25AU-0.36AU of thesystem. Three possible scenarios may be accounted for formation of eb and ec:i convergent migration of two planets and the 3:1 MMR trapping; iiplanetary scattering; iii divergent migration and the 3:1 MMR crossing. As weshowed that the probability for the two giant planets in 3:1 MMR is low ~3%,scenario i is less likely. According to models ii and iii, the finaleccentricity of inner planet eb may oscillate between 0-0.06, comparable tothat of Jupiter 0.03-0.06. An inspection of eb, ec secular motion may behelpful to understand which model is really responsible for the eccentricityformation.



Autor: Su Wang, Gang Zhao, Ji-Lin Zhou

Fuente: https://arxiv.org/







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