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年轻恒星系统发现结晶水冰

2025-05-16 17:25 by 诺比与平行宇宙的钥匙

韦伯太空望远镜首次在一个年轻的恒星系统中发现了结晶水冰(frozen water ice),这是天文学上的一项重大突破。这次的发现是在一个名为 HD 181327 的恒星系统,HD 181327是一颗年轻的主序恒星,距离我们约 155 光年,比我们的太阳年轻非常多(太阳约 46 亿年历史),年龄约 2,300 万年。此恒星的质量比太阳稍大一些,温度也更高,因此在其周围形成了一个稍微大一点的系统。韦伯的观测证实了恒星与其碎屑盘(debris disks)之间存在明显的间隙,即一片没有尘埃的广阔区域。水冰在HD 181327系统中分布并不均匀,碎屑盘的外部区域由超过20%的水冰组成,越近之处发现的水冰就越少。在碎片盘的中部,韦伯探测到了大约8%的水冰,在这里冻结水粒子的产生速度可能比其毁灭速度稍快。而在最靠近恒星的区域,韦伯几乎没有发现任何物体,可能的原因是恒星的紫外线蒸发了近处的水冰斑点,或者是被称为行星的岩石在其内部锁定了冰冻的水,而韦伯望远镜无法探测到。

science.nasa.gov/missions/webb/another-first-nasa-webb-identifies-frozen-water-in-young-star-system/

天文館:韋伯首次發現年輕恆星系統中的結晶水冰

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年轻恒星系统发现结晶水冰

2025-05-16 17:25 by 诺比与平行宇宙的钥匙

韦伯太空望远镜首次在一个年轻的恒星系统中发现了结晶水冰(frozen water ice),这是天文学上的一项重大突破。这次的发现是在一个名为 HD 181327 的恒星系统,HD 181327是一颗年轻的主序恒星,距离我们约 155 光年,比我们的太阳年轻非常多(太阳约 46 亿年历史),年龄约 2,300 万年。此恒星的质量比太阳稍大一些,温度也更高,因此在其周围形成了一个稍微大一点的系统。韦伯的观测证实了恒星与其碎屑盘(debris disks)之间存在明显的间隙,即一片没有尘埃的广阔区域。水冰在HD 181327系统中分布并不均匀,碎屑盘的外部区域由超过20%的水冰组成,越近之处发现的水冰就越少。在碎片盘的中部,韦伯探测到了大约8%的水冰,在这里冻结水粒子的产生速度可能比其毁灭速度稍快。而在最靠近恒星的区域,韦伯几乎没有发现任何物体,可能的原因是恒星的紫外线蒸发了近处的水冰斑点,或者是被称为行星的岩石在其内部锁定了冰冻的水,而韦伯望远镜无法探测到。

science.nasa.gov/missions/webb/another-first-nasa-webb-identifies-frozen-water-in-young-star-system/

天文館:韋伯首次發現年輕恆星系統中的結晶水冰

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