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科学家发现“超级地球”

良辰 简体 | 繁体
超级地球
科学家发现两颗“超级地球”行星，它们围绕距地球100光年外的一颗恒星运行，其中一颗可能拥有孕育生命的必要条件。（图片：Getty Images/Science Photo Libra）

科学家发现两颗“超级地球”行星，它们围绕距地球100光年外的一颗恒星运行，其中一颗可能拥有孕育生命的必要条件。

这颗名为LP 890-9的恒星，承载著两颗系外行星，名为LP 890-9b和LP 890-9c，其中前者首先被美国宇航局(NASA)的凌日系外行星勘测卫星（TESS）发现。

科学家使用SPECULOOS（寻找超越超冷恒星的可居住行星）望远镜，其中一个在伯明翰大学运行，然后确定了另一颗行星。

LP 890-9b比地球大30%，仅用2.7天就完成了围绕恒星的轨道。然而，LP 890-9c比地球大40%，有一个约8.5天的较长的轨道周期——使它处于围绕其恒星的“宜居区”。

SPECULOOS的目标是寻找太阳系外、具有维持生命条件的类地行星。

Amaury Triaud教授，带领SPECULOOS工作组发现了第二颗行星。他说：“宜居区的概念是，类似地球的地质和大气条件的行星，其表面温度允许水在数十亿年内保持液体状态。这促使我们进行更多的观察，找出这颗行星是否有大气层，如果有的话，研究是否适合生命生存。”

这颗恒星也被称为TOI-4306或SPECULOOS-2，是继TRAPPIST-1之后发现的，承载行星的第二颗温度最低的恒星，它承载了七颗地球大小的凌日行星。

LP 890-9b是该系统的内行星，在TESS搜索围绕附近恒星运行的系外行星时，被确定为可能的候选行星。接下来，它被SPECULOOS望远镜确认。

研究人员随后利用这些望远镜，在该系统中寻找更多会被TESS错过的凌日行星。

TESS对近红外光的敏感度有限，而近红外光是由LP 890-9这样非常冷的恒星发出的，这使得后续工作特别重要。

比利时列日大学的研究员Laetitia Delrez说：“TESS使用凌日法搜索系外行星，同时监测数千颗恒星的亮度，寻找可能由行星在其恒星前经过而造成的轻微变暗。然而，地面望远镜的后续工作是必要的，以确认探测到的候选行星的性质，并完善其尺寸和轨道特性的测量。”

SPECULOOS项目的望远镜，安装在欧洲南方天文台（ESO），位于智利的帕拉纳尔天文台和特内里费岛上。

他们的相机，对较冷恒星发出的光非常敏感，因此可以高精度观测它们。

SPECULOOS项目的主要研究人员Michaël Gillon说：“SPECULOOS的目标是寻找类似地球的宜居行星，这些行星环绕著太阳系附近的一些最小和最冷的恒星，例如我们在2016年发现的TRAPPIST-1行星系统。这类行星特别适合对其大气层进行详细的研究，也适合用大型观测站，如詹姆斯-韦伯太空望远镜（JWST）来寻找可能的生命化学踪迹。”

LP 890-9c是SPECULOOS望远镜在观测其恒星时，发现的第二颗系外行星，因此研究人员将其重新命名为SPECULOOS-2c。

夏威夷的MuSCAT3天文成像仪确认，它的轨道周期是8.5天，位于其恒星周围的“宜居带”。这意味著它对于外星生命来说，既不会太热也不会太冷，但是在确认它适合居住之前，研究人员还得通过JWST研究它的大气层。

LP 890-9c可能是JWST研究宜居行星的第二个最有利的目标，仅次于TRAPPIST-1行星。

Triaud教授补充说：“探测尽可能多的宜居类地行星，以研究系外行星气候的多样性，并最终能够评估宇宙中生物出现的频率，这一点很重要。”

甚么是“超级地球”？

超级地球是一类太阳系外行星，其质量比地球大，但比海王星和天王星等冰巨星要轻。

它们由气体、岩石或两者的组合构成，在我们的银河系中普遍存在。它们的大小是地球的两倍，质量是地球的10倍。它们不一定具有与地球相似的成分，可能被水或冰覆盖，或者由密集的气体构成。

（原文链接： Two ‘super-Earth’ planets are found orbiting a small star 100 light-years away – and scientists believe one of them could host alien life）

版权声明：

本文由看新闻网原创、编译或首发，并保留版权。转载必须保持文本完整，声明文章出自看新闻网并包含原文标题及链接。

本文网址：https://vct.news/news/2d2a6b75-d3c1-4013-ab5f-db4954056398

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