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arXiv 1502.04260astro-ph.EP
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行星系形成的理论模型。II。形成后演化

Theoretical models of planetary system formation. II. Post-formation evolution

S. Pfyffer, Y. Alibert, W. Benz, D. Swoboda

摘要:

我们通过计算合成系统从气体盘的清除到动力学演化阶段的长期演化,扩展了行星形成合成的结果。我们使用辛积分器SyMBA数值积分的行星轨道为100 Ma,人口从以前的研究作为初始条件。我们表明,在人口研究,质量和半长轴分布的经验只有微小的变化,从后形成的演变。我们还表明,根据其初始分布,行星的偏心率可以统计增加或减少的结果,引力相互作用。我们发现,行星质量和轨道间距提供的行星形成模型不会导致偏心率分布相比,观察到的系外行星偏心率,需要其他现象,如恒星飞掠占观察到的偏心率。

英文摘要:

We extend the results of planetary formation synthesis by computing the long-term evolution of synthetic systems from the clearing of the gas disk into the dynamical evolution phase. We use the symplectic integrator SyMBA to numerically integrate the orbits of planets for 100 Ma, using populations from previous studies as initial conditions.We show that within the populations studied, mass and semi-major axis distributions experience only minor changes from post-formation evolution. We also show that, depending upon their initial distribution, planetary eccentricities can statistically increase or decrease as a result of gravitational interactions. We find that planetary masses and orbital spacings provided by planet formation models do not result in eccentricity distributions comparable to observed exoplanet eccentricities, requiring other phenomena such as e.g. stellar fly-bys to account for observed eccentricities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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