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arXiv 0903.2334astro-ph.EP
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多行星系中类地行星的适宜居带

Habitable Zones for Earth-mass Planets in Multiple Planetary Systems

Ji Jianghui, Liu Lin, H. Kinoshita, Li Guangyu

摘要:

本文通过数值模拟研究了多行星系中地球质量行星的宜居带和动力学结构。例如,在HD 69830系统中,我们广泛地探索了三个海王星质量的同伴的行星配置,其中一个大质量的类地行星居住在0.07 AU $\leq a \leq$ 1.20 AU,以研究该系统中的小行星结构。我们强调,有至少$10^5$年的稳定区的低质量类地行星位于0.3和0.5 AU之间,和0.8和1.2 AU的最终偏心率为$e < 0.20$。此外,我们还发现小行星带的积累或耗尽也受到外行星轨道共振的影响,例如,与行星C的2:1和3:2平均运动共振(MMRs)以及与行星D的5:2和1:2 MMRs的小行星间隙。在动力学意义上,潜在类地行星或HZ存在的合适候选区域为0.35 AU $< a < $ 0.50 AU,以及0.80 AU $< a < $ 1.00 AU,这对于该系统中可能存在的小行星结构是有意义的。

英文摘要:

We perform numerical simulations to study the Habitable zones (HZs) and dynamical structure for Earth-mass planets in multiple planetary systems. For example, in the HD 69830 system, we extensively explore the planetary configuration of three Neptune-mass companions with one massive terrestrial planet residing in 0.07 AU $\leq a \leq$ 1.20 AU, to examine the asteroid structure in this system. We underline that there are stable zones of at least $10^5$ yr for low-mass terrestrial planets locating between 0.3 and 0.5 AU, and 0.8 and 1.2 AU with final eccentricities of $e < 0.20$. Moreover, we also find that the accumulation or depletion of the asteroid belt are also shaped by orbital resonances of the outer planets, for example, the asteroidal gaps at 2:1 and 3:2 mean motion resonances (MMRs) with Planet C, and 5:2 and 1:2 MMRs with Planet D. In a dynamical sense, the proper candidate regions for the existence of the potential terrestrial planets or HZs are 0.35 AU $< a < $ 0.50 AU, and 0.80 AU $< a < $ 1.00 AU for relatively low eccentricities, which makes sense to have the possible asteroidal structure in this system.

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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