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社评“胡桃之旅行者坤坤”-知识课堂

国际最新天文学胡桃之旅行者坤坤研究发现迄今最年轻的凌星行星

来源: 北京日报
2024-11-23 15:42:41

最佳回答

“胡桃之旅行者坤坤”国际最新天文学胡桃之旅行者坤坤研究发现迄今最年轻的凌星行星

  中新胡桃之旅行者坤坤网北京11月21日电 (记胡桃之旅行者坤坤者 孙自法)国际著名学术期刊《自然》最新发表的一篇天文学论文称,研究人员探测到一颗凌星超年轻恒星的巨行星。该发现显示,这是迄今发现的最年轻的凌星行星。

  该论文介绍,科学家之前在年龄在1000万到4000万年的恒星周围已发现超过十几颗凌星行星(从一颗恒星与地球这类观察者之间经过的行星),但一直没有探测到更年轻的凌星行星。这或许是因为这些行星还没有完全形成,或是因为地球上对这类行星的视野被残余的原行星盘所遮挡,原行星盘为新形成恒星周围的致密气体和尘埃环,行星便诞生于此。

本项研究成果相关示意图。施普林格自然/供图

  在本项研究中,论文第一作者兼通讯作者、美国北卡罗来纳大学教堂山分校Madyson G. Barber和同事及合作者一起,分析了美国航空航天局(NASA)“凌日系外行星勘测卫星”传回的数据,观测到一个年龄在300万年的年轻恒星,这个名为IRAS 04125+2902的恒星与地球相对较近(160秒差距)。围绕该恒星的外部原行星盘没有对齐,而且几乎是正面朝上而不是侧面,同时还有一个缺损内盘。

  集合这些特征,让研究人员得以对凌星原行星IRAS 04125+2902 b进行观测。他们分析发现,这颗行星的轨道周期为8.83天,半径是地球的10.7倍,质量约是木星的30%。研究人员认为,它可能是常被发现绕主序星旋转的超级地球和超级海王星的前体。

  鉴于这颗恒星和行星都很年轻,拥有罕见的非对齐盘,以及相对地球位置较近,论文作者认为,这个系统可能是研究行星形成早期阶段的一个有用目标。(完)

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