F星系统中可能的系外卫星的气候学和紫外线基础的可居住性
Climatological and UV-based Habitability of Possible Exomoons in F-star Systems
摘要：
我们探索了F5 V和F9.5 V之间光谱类型的F型恒星的天体生物学意义，这些恒星在其气候宜居带内或附近拥有木星型行星。这些行星，或者至少是其中的一个子集，也可能拥有岩石系外卫星，这可能提供可居住的环境。我们的工作考虑了八个选定的系统。在这些系统中的类地行星轨道明显不同，偏心率在0.08（关于火星）和0.72之间。我们考虑恒星的紫外光环境提供的光球恒星辐射，这使我们能够计算紫外宜居带的系统。根据先前的研究，DNA被视为碳基大分子的替代物，遵循外星生物学可能以碳氢化合物为基础的范式。我们发现，对DNA造成的损害是显着不同的系统研究的范围内，也根据不同的轨道的彗星型行星，特别是高椭圆率的系统，如预期的那样。对于某些系统来说，与今天的地球或太古宙相比，损害的价值过高。考虑到在可预见的未来，探测不同类型恒星周围的系外卫星仍然具有挑战性，我们将我们的工作视为一个例子和模板，用于调查太阳系外天体气候和紫外线可居住性的综合要求。
英文摘要：
We explore the astrobiological significance of F-type stars of spectral type between F5 V and F9.5 V, which possess Jupiter-type planets within or close to their climatological habitable zones. These planets, or at least a subset of those, may also possess rocky exomoons, which potentially offer habitable environments. Our work considers eight selected systems. The Jupiter-type planets in these systems are in notably differing orbits with eccentricities between 0.08 (about Mars) and 0.72. We consider the stellar UV environments provided by the photospheric stellar radiation, which allows us to compute the UV habitable zones for the systems. Following previous studies, DNA is taken as a proxy for carbon-based macromolecules following the paradigm that extraterrestrial biology might be based on hydrocarbons. We found that the damage inflicted on DNA is notably different for the range of systems studied, and also varies according to the orbit of the Jupiter-type planet, especially for systems of high ellipticity, as expected. For some systems excessive values of damage are attained compared to today's Earth or during the Archean eon. Considering that the detection of exomoons around different types of stars will remain challenging in the foreseeable future, we view our work also as an example and template for investigating the combined requirements of climatological and UV-based habitability for exosolar objects.
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