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韦伯观测到下沙雨的气态巨行星
#太空

韦伯望远镜(JWST)观测到一颗距离地球约 300 光年的年轻恒星 YSES-1 周围的两颗系外行星:YSES-1 b 与YSES-1 c,皆为气态巨行星,并且其大气中富含二氧化矽云层(类似沙子)。这些「沙云」经由类似地球水循环的升华与凝结过程维持在空中,甚至形成「沙雨」。YSES-1 c 质量约为木星的 14 倍,其大气中的二氧化矽沙云使其呈现红色外观,并有沙尘向行星核心降落。而另一颗 YSES-1 b 质量约为木星的 6倍,目前仍在形成中,周围环绕着一层扁平的行星盘为其提供丰富的矽酸盐材料,就像正在建造沙堡一样。这不仅是首次直接观测到系外行星大气高层中的二氧化矽云(如富铁辉石、钙铁榴石等),也是首次在行星盘中探测到矽酸盐。
www.nature.com/articles/s41586-025-09174-w
天文館:韋伯望遠鏡發現下「沙雨」的系外行星與沙堡世界



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韦伯观测到下沙雨的气态巨行星
#太空

韦伯望远镜(JWST)观测到一颗距离地球约 300 光年的年轻恒星 YSES-1 周围的两颗系外行星:YSES-1 b 与YSES-1 c,皆为气态巨行星,并且其大气中富含二氧化矽云层(类似沙子)。这些「沙云」经由类似地球水循环的升华与凝结过程维持在空中,甚至形成「沙雨」。YSES-1 c 质量约为木星的 14 倍,其大气中的二氧化矽沙云使其呈现红色外观,并有沙尘向行星核心降落。而另一颗 YSES-1 b 质量约为木星的 6倍,目前仍在形成中,周围环绕着一层扁平的行星盘为其提供丰富的矽酸盐材料,就像正在建造沙堡一样。这不仅是首次直接观测到系外行星大气高层中的二氧化矽云(如富铁辉石、钙铁榴石等),也是首次在行星盘中探测到矽酸盐。
www.nature.com/articles/s41586-025-09174-w
天文館:韋伯望遠鏡發現下「沙雨」的系外行星與沙堡世界

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