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科学家们已经确定了迄今发现的最古老的行星系统之一。该行星系统有一颗被称为 TOI-561b 的岩石行星,围绕一颗 100
亿年的恒星运行。这颗恒星的年龄是太阳年龄的两倍多,研究人员说,这表明行星从宇宙早期就已经形成了。
TOI-561b 的大小大约是地球的 1.5
倍,使其成为一颗“超级地球”。这颗行星最有趣的一个方面是,它在一个地球日内绕其恒星运行两次以上。它的运行速度如此之快,是因为它离宿主星非常近。
“超级地球”适宜居住的几率很小。据信它的表面温度超过 1700
摄氏度。这颗行星的另一个有趣之处在于,它的密度相对于它的大小来说是非常低的。虽然它的质量是地球的三倍,但它的密度与我们的星球相同。科学家说,这表明
TOI-561b 非常古老。
古老行星由于拥有较少的金属等重元素,所以密度较低。重元素是在恒星内部产生的,因为恒星变老后会爆炸成超新星。超新星爆炸将元素分布到周围的空间中,行星形成时就将这些元素纳入其中。在早期的宇宙中,恒星爆炸发生的次数较少,其结果是行星形成时内部的重元素较少。
TOI-561b 是有史以来发现的最古老的岩质行星之一。研究人员 Lauren Weiss 表示,TOI-561b 的存在证明岩质行星几乎从 140
亿年前宇宙开始就已经形成。这颗行星是利用美国宇航局(NASA)TESS 任务的数据发现的,并利用夏威夷的W.M.Keck 天文台进行了确认。