天文学家利用双子座南望远镜对距地球320光年的超热木星WASP-189b进行观测，首次同时在该行星大气中测量到了镁和硅元素1。这项由亚利桑那州立大学研究生Jorge Antonio Sanchez领导的国际研究团队开展的研究，采用了高分辨率红外光栅摄谱仪（IGRINS）进行测量1。
研究结果表明，WASP-189b的镁硅比例与其母星的比例相匹配1。这一发现为长期以来关于行星形成的基本假设提供了直接观测证据1。该研究成果已发表于《自然通讯》2026年第17卷第1期1。
科学家表示，这项研究将帮助预测遥远类地行星的组成成分，并为寻找宜居世界提供指导1。WASP-189b位于天秤座1。
Astronomers have made a landmark observation of an exoplanet's atmospheric composition, providing direct evidence for a long-standing hypothesis about how planets form. Using the Gemini South telescope, an international research team led by Jorge Antonio Sanchez, a graduate student at Arizona State University, simultaneously measured magnesium and silicon in the atmosphere of WASP-189b, an ultra-hot Jupiter located 320 light-years away in the constellation Libra.1 The researchers discovered that the ratio of magnesium to silicon on WASP-189b matches that of its host star, validating the theoretical expectation that planets inherit the chemical composition of their parent stars.1
The breakthrough employed high-resolution infrared spectroscopy, specifically an instrument called IGRINS, to detect these elements in the exoplanet's atmosphere with unprecedented precision.1 This is the first time magnesium and silicon have been simultaneously measured in an exoplanet's atmosphere, marking a significant methodological advance in planetary characterization.1 The findings, published in Nature Communications in 2026, hold important implications for predicting the composition of distant terrestrial planets and identifying potentially habitable worlds.1
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