原行星盘中光化学诱导甲基阳离子的形成
Formation of the Methyl Cation by Photochemistry in a Protoplanetary Disk
AI总结：
本文利用JWST观测首次在太阳系外原行星盘中发现甲基阳离子CH3+，证实紫外辐照能激活气相有机化学反应。
摘要：
四十年前有人提出，星际介质中的气相有机化学反应是由甲基阳离子CH3+引发的，但迄今为止在太阳系外尚未观测到它。此前曾引入涉及尘埃表面过程的替代路径。在此我们报告JWST对猎户座恒星形成区中原行星盘内CH3+的观测结果。我们发现气相有机化学反应是由紫外辐照激活的。
英文摘要：
Forty years ago it was proposed that gas phase organic chemistry in the interstellar medium was initiated by the methyl cation CH3+, but hitherto it has not been observed outside the Solar System. Alternative routes involving processes on grain surfaces have been invoked. Here we report JWST observations of CH3+ in a protoplanetary disk in the Orion star forming region. We find that gas-phase organic chemistry is activated by UV irradiation.
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