论文标题
对附近恒星E Eridani的丰富行星系统的综合分析:系外球星成像和生物签名搜索的理想目标
An Integrative Analysis of the Rich Planetary System of the Nearby Star e Eridani: Ideal Targets For Exoplanet Imaging and Biosignature Searches
论文作者
论文摘要
第五个最聪明的太阳般的明星埃里达尼(E Eridani)至少拥有三个行星,可能会藏起来更多。但是,系统及其完整的行星体系结构中候选地球的真实性仍然未知。在这里,我们通过Dynamite分析了E Eridani的行星架构,该方法通过将统计,系外行人口介绍水平知识与系统上可用的特定信息相结合,从而提供了对系统体系结构(以及可能尚未实现的行星)进行集成评估的方法。根据来自2000多个行星的开普勒人群人群信息,炸药可以预测系统中其他行星的最可能位置。此外,我们通过N体模拟分析了E Eridani系统的动态稳定性。我们的炸药和动力稳定性分析为候选候选者G,C和F提供了支持,还可以在系统的可居住区中预测一个具有549-733天轨道周期的额外行星候选者。我们发现,如果存在的行星候选者也将位于可居住的区域。我们的动力稳定性分析还表明,据报道,E Eridani行星偏心率不允许稳定的系统,表明它们较低。我们介绍了一种基于行星反照率分布的先验,介绍了一种估计系外行星平衡和表面温度的新统计方法。 E Eridani是一个丰富的行星系统,有可能包含两个潜在的可居住行星,其与我们的太阳系附近使其成为未来成像研究和生物签名搜索的重要目标。
e Eridani, the fifth-closest Sun-like star, hosts at least three planets and could possibly harbor more. However, the veracity of the planet candidates in the system and its full planetary architecture remain unknown. Here we analyze the planetary architecture of e Eridani via DYNAMITE, a method providing an integrative assessment of the system architecture (and possibly yet-undetected planets) by combining statistical, exoplanet-population level knowledge with incomplete but specific information available on the system. DYNAMITE predicts the most likely location of an additional planet in the system based on the Kepler population demographic information from more than 2000 planets. Additionally, we analyze the dynamical stability of e Eridani system via N-body simulations. Our DYNAMITE and dynamical stability analyses provide support for planet candidates g, c, and f, and also predict one additional planet candidate with an orbital period between 549 -- 733 days, in the habitable zone of the system. We find that planet candidate f, if it exists, would also lie in the habitable zone. Our dynamical stability analysis also shows that the e Eridani planetary eccentricities, as reported, do not allow for a stable system, suggesting that they are lower. We introduce a new statistical approach for estimating the equilibrium and surface temperatures of exoplanets, based on a prior on the planetary albedo distribution. e Eridani is a rich planetary system with a possibility of containing two potentially habitable planets, and its vicinity to our Solar System makes it an important target for future imaging studies and biosignature searches.