A terrestrial planet candidate in a temperate orbit around Proxima Centauri
A terrestrial planet candidate in a temperate orbit around Proxima Centauri
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DOI：
10.1038/nature19106
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发表时间：
2016-08-25
期刊：
影响因子：
64.8
通讯作者：
Zechmeister, Mathias
中科院分区：
文献类型：
--
作者：
Anglada-Escude, Guillem;Amado, Pedro J.;Zechmeister, Mathias
距离太阳1.295秒差距（1）的红矮星Proxima Centauri（半人马座C，GL 551，HIP 70890或简称Proxima）是太阳最近的恒星邻居，也是研究得最好的低质量恒星之一。它的有效温度只有3，050开尔文左右，光度是太阳的0.15%，测量的半径是太阳半径的14%，质量大约是太阳质量的12%。虽然比邻星被认为是一颗中等活跃的星星，但它的自转周期约为83天（参考文献3），它的静止活动水平和X射线光度（4）与太阳相当。在这里，我们报告的观测结果揭示了一个小行星的存在，其最小质量约为1.3地球质量，绕Proxima轨道运行，周期约为11.2天，半长轴距离约为0.05天文单位。它的平衡温度在水在其表面上可以是液体的范围内（5）。
At a distance of 1.295 parsecs(1), the red dwarf Proxima Centauri (a Centauri C, GL 551, HIP 70890 or simply Proxima) is the Sun's closest stellar neighbour and one of the best-studied low-mass stars. It has an effective temperature of only around 3,050 kelvin, a luminosity of 0.15 per cent of that of the Sun, a measured radius of 14 per cent of the radius of the Sun2 and a mass of about 12 per cent of the mass of the Sun. Although Proxima is considered a moderately active star, its rotation period is about 83 days (ref. 3) and its quiescent activity levels and X-ray luminosity(4) are comparable to those of the Sun. Here we report observations that reveal the presence of a small planet with a minimum mass of about 1.3 Earth masses orbiting Proxima with a period of approximately 11.2 days at a semi-major-axis distance of around 0.05 astronomical units. Its equilibrium temperature is within the range where water could be liquid on its surface(5).