arXiv 1003.12072010-03-05astro-ph.SR

后MS阶段主星的宜居带

Habitable Zones of Host Stars During the Post-MS Phase

Jianpo Guo, Fenghui Zhang, Zhanwen Han

备注：: 6 pages, 7 figures. Accepted by Ap & SS
DOI：: 10.1007/s10509-010-0321-2

摘要：

一颗恒星会随着恒星演化而变得越来越亮，其宜居带的距离也会越来越远。一些在主序星宜居带外的行星，可能在其他演化阶段进入主序星的宜居带。位于其主星的宜居带内的类地行星通常被认为适合生命存在。此外，一颗巨大行星周围的岩石卫星也可能适合生命生存，前提是行星-卫星系统位于其主星的宜居带内。利用Eggleton程序和宜居带边界通量，计算了主序位相后太阳的宜居带。发现火星轨道和木星轨道分别在亚巨星分支阶段和红巨星分支阶段进入太阳的宜居带。在氦燃烧阶段，土星的轨道将进入太阳的宜居带约1.37亿年。土星是一颗巨大的气态行星，任何时候都不可能有生命。然而，土星的岩石卫星土卫六可能适合生物进化，并在那段时间成为另一个地球。对于低质量的恒星，在氦燃烧阶段有类似的宜居带，因为这些恒星在那个阶段有类似的核心质量和光度。

英文摘要：

A star will become brighter and brighter with stellar evolution, and the distance of its habitable zone will become farther and farther. Some planets outside the habitable zone of a host star during the main sequence phase may enter the habitable zone of the host star during other evolutionary phases. A terrestrial planet within the habitable zone of its host star is generally thought to be suited to life existence. Furthermore, a rocky moon around a giant planet may be also suited to life survive, provided that the planet-moon system is within the habitable zone of its host star. Using Eggleton's code and the boundary flux of habitable zone, we calculate the habitable zone of our Solar after the main sequence phase. It is found that Mars' orbit and Jupiter's orbit will enter the habitable zone of Solar during the subgiant branch phase and the red giant branch phase, respectively. And the orbit of Saturn will enter the habitable zone of Solar during the He-burning phase for about 137 million years. Life is unlikely at any time on Saturn, as it is a giant gaseous planet. However, Titan, the rocky moon of Saturn, may be suitable for biological evolution and become another Earth during that time. For low-mass stars, there are similar habitable zones during the He-burning phase as our Solar, because there are similar core masses and luminosities for these stars during that phase.

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英文摘要：

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