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Isotope abundance ratios have an important role in astronomy and planetary sciences, providing insights into the origin and evolution of the Solar System, interstellar chemistry and stellar nucleosynthesis. In contrast to deuterium/hydrogen ratios, carbon isotope ratios are found to be roughly constant in the Solar System, but do vary on galactic scales with a 12C/13C isotopologue ratio of around 68 in the current local interstellar medium. In molecular clouds and protoplanetary disks, 12CO/13CO ratios can be altered by ice and gas partitioning, low-temperature isotopic ion-exchange reactions and isotope-selective photodissociation9. Here we report observations of 13CO in the atmosphere of the young, accreting super-Jupiter TYC 8998-760-1 b, at a statistical significance of more than six sigma. Marginalizing over the planet’s atmospheric temperature structure, chemical composition and spectral calibration uncertainties suggests a 12CO/13CO ratio of。
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统计学家范剑青:把 AI 学习金融,变为现实 | 万字长文
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史上最全鹿晗私服大盘点,颜值高就是好,轻松hold住所有风格
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