星期三 2025年 8月 20日
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欢迎“第二地球”! 新发现宜居行星

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“TOI 700 d”的模拟图。

美国太空总署(NASA)本周在夏威夷檀香山举行的美国天文学会年度大会中宣布,发现一颗和地球一般大小的行星“TOI 700 d”,位于宿主恒星的可居住范围内,容许液态水存在,且距离地球仅101.5光年。

NASA天文物理部门主任赫茨指出,这是通过凌日系外行星巡天卫星(TESS)的任务而发现,该项目是在于寻找和地球一般大小、绕行宿主恒星的行星。TESS起初将宿主恒星TOI 700分类错误,后来被包括高中生史宾塞在内的业余天文学者纠正。修正恒星体积后,行星的大小也跟著下修,接著发现最远的一颗行星体积和地球一般大,且位于可居住区域。这项发现后来经由史匹哲太空望远镜(Spitzer Space Telescope)证实。

TOI 700与其三颗行星。其中行星d位于天文宜居带,意味着表面容许液态水存在。

作为主恒星的TOI 700体积不大,约太阳的40%,表面温度只有太阳的一半。TESS在轨道上发现三枚行星,分别命名为TOI 700 b、c和d,其中只有d位于所谓的可居住区域,允许液态水存在,仅比地球还大20%,公转周期为37天。这是2018年发射的TESS首次发现类似行星。

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