arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1509.02429astro-ph.EP
收藏

我们希望在宜居带中观测到哪种类型的行星?

Which type of planets do we expect to observe in the Habitable Zone?

Vardan Adibekyan, Pedro Figueira, Nuno C. Santos

摘要:

我们利用多普勒光谱和凌日技术探测到的类地行星样本,探讨了行星轨道参数与其宿主恒星金属丰度的关系。我们证实了之前的结果(尽管仍然是基于小样本的行星),即围绕富含金属的恒星运行的超级地球并不像我们观察到的那样远离它们的宿主恒星。这些超级地球的轨道与金属丰富的主机通常不会达到宜居带(HZ),使他们非常热,不适合居住。我们发现,HZ中的大多数已知行星都围绕着它们的GK型宿主运行,这些宿主金属贫乏。在HZ的行星的金属贫乏的性质表明相对于Si和相对于Fe的高Si丰度的高Mg丰度。这些结果使我们推测HZ行星可能在古代银河系中更频繁,并且具有与我们地球不同的成分。

英文摘要:

We used a sample of super-Earth-like planets detected by the Doppler spectroscopy and transit techniques to explore the dependence of orbital parameters of the planets on the metallicity of their host stars. We confirm the previous results (although still based on small samples of planets) that super-Earths orbiting around metal-rich stars are not observed to be as distant from their host stars as we observe their metal-poor counterparts to be. The orbits of these super-Earths with metal-rich hosts usually do not reach into the Habitable Zone (HZ), keeping them very hot and inhabitable. We found that most of the known planets in the HZ are orbiting their GK-type hosts which are metal-poor. The metal-poor nature of planets in the HZ suggests a high Mg abundance relative to Si and high Si abundance relative to Fe. These results lead us to speculate that HZ planets might be more frequent in the ancient Galaxy and had compositions different from that of our Earth.

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。

↑