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这颗“彗星”的尾巴有点长 前所未见 - 站长搜索
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这颗“彗星”的尾巴有点长 前所未见

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2015-06-26 13:15:08 转载来源: 网络整理/侵权必删

据国外媒体报道,美国宇航局哈勃空间望远镜近日观测到一颗十分特别的系外行星,根据艺术家绘图的描述,这颗系外行星酷似拖着一条长长的尾巴,于是科学家就开始研究为何会出现这样的情景。该行星距离我们仅30光年,属于较近的系外行星,位于GJ 436红矮星系统中,因此其编号为GJ 436b

据国外媒体报道,美国宇航局哈勃空间望远镜近日观测到一颗十分特别的系外行星,根据艺术家绘图的描述,这颗系外行星酷似拖着一条长长的尾巴,于是科学家就开始研究为何会出现这样的情景。该行星距离我们仅30光年,属于较近的系外行星,位于GJ 436红矮星系统中,因此其编号为GJ 436b。GJ 436b行星表面的氢物质被大量蒸发,形成了壮观的尾巴,与彗星有些相似。科学家认为此前从没有见过类似的现象发生于系外行星中,这是首个案例。

观测发现,GJ 436b上的气体蒸发后形成了庞大的彗星状云物质,体积极具增大,可能达到其恒星的50倍,大量的物质蒸发使得这颗海王星大小的行星可以“萎缩”。科学家发现蒸发后的GJ 436b可能会只剩下坚硬的岩石内核,大小接近超级地球的规模。瑞士日内瓦大学天文台科学家戴维-艾伦莱克称,根据我们的计算,蒸发非常剧烈,但目前还不至于将这颗行星的物质蒸发殆尽,在过去的数十年以内,GJ 436b可能损失了10%的大气物质。

从行星类型上看,GJ 436b被认为是一颗温暖的海王星,之所以这么称呼是它距离太阳系太近了,太阳系内的海王星属于冰巨星,温度极低,但这颗海王星轨道半径非常小,表面也非常炎热。GJ 436b也是太阳系内所没有的行星类型,科学家认为一旦GJ 436b的大气被完全蒸发,那么就剩下一个岩石核心,其大小与我们目前发现的超级地球非常接近,这个发现也在一定程度解释了为什么我们迄今在距离恒星较近的轨道上发现许多超级地球。

此前科学家对此类行星已经有所了解,但是需要更加强大的望远镜才能进一步研究,哈勃望远镜提供了强大的紫外观测能力,科学家厄莱雷奇认为我们必须借助哈勃的“眼睛”,这样才能够发现GJ 436b所发生的事件。本项研究成果发表在6月25日版的《自然》杂志上。

标签: 这颗 彗星 尾巴 有点 前所未见


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