原行星盘中水的旋转谱线发射
Rotational Line Emission from Water in Protoplanetary Disks
摘要：
星周盘为年轻恒星的生长和行星形成提供了物质储存库。我们结合一个高层次的辐射转移程序与一个典型的金牛座T星盘的热化学模型，探讨诊断潜力的远红外线探测盘结构的水。我们讨论了纯旋转的H2O线与赫歇尔空间天文台的可观测性，特别是剩余气体的水主要是冻结了。我们发现，测量地面110-101 ortho-H2O跃迁的谱线轮廓以及该谱线与312-303和221-212谱线的比值可以提供5-100 AU之间的气相水的信息，但不能提供预计在较小半径处发生的雪线的信息。
英文摘要：
Circumstellar disks provide the material reservoir for the growth of young stars and for planet formation. We combine a high-level radiative transfer program with a thermal-chemical model of a typical T Tauri star disk to investigate the diagnostic potential of the far-infrared lines of water for probing disk structure. We discuss the observability of pure rotational H2O lines with the Herschel Space Observatory, specifically the residual gas where water is mainly frozen out. We find that measuring both the line profile of the ground 110-101 ortho-H2O transition and the ratio of this line to the 312-303 and 221-212 line can provide information on the gas phase water between 5-100 AU, but not on the snow line which is expected to occur at smaller radii.
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