Water vapor as a probe of the origin of gas in debris disks,Astronomy & Astrophysics

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Water vapor as a probe of the origin of gas in debris disks
Astronomy & Astrophysics ( IF 5.4 ) Pub Date : 2024-12-17 , DOI: 10.1051/0004-6361/202452252
Yasuhiro Hasegawa, Riouhei Nakatani, Isabel Rebollido, Meredith MacGregor, Björn J. R. Davidsson, Dariusz C. Lis, Neal Turner, Karen Willacy

Context. Debris disks contain the formation and evolution histories of planetary systems. Recent detections of gas in these disks have received considerable attention, as the origin of the gas sheds light on ongoing disk evolution and the current composition of planet-forming materials.Aims. Observations of CO gas alone, however, cannot reliably differentiate between two leading and competing hypotheses: (1) that the observed gas is a leftover of protoplanetary disk gas, and (2) that the gas is the outcome of collisions between icy bodies. We propose that such a differentiation may become possible by observing cold water vapor.Methods. We performed order-of-magnitude analyses and compared these with existing observations.Results. We show that different hypotheses lead to different masses of water vapor. This occurs because, for both hypotheses, the presence of cold water vapor is attributed to photodesorption from dust particles by attenuated interstellar UV radiation. Cold water vapor cannot be observed by current astronomical facilities as most of its emission lines fall in the far-IR (FIR) range.Conclusions. This work highlights the need for a future FIR space observatory to reveal the origin of gas in debris disks and the evolution of planet-forming disks in general.

中文翻译：

水蒸气作为碎片盘中气体来源的探针

上下文。碎片盘包含行星系统的形成和演化历史。最近在这些盘中检测到的气体受到了相当大的关注，因为气体的来源揭示了正在进行的盘演变和行星形成物质的当前组成。目标。然而，仅对 CO 气体的观测并不能可靠地区分两个主要和相互竞争的假设：（1）观察到的气体是原行星盘气体的残余物，以及（2）气体是冰冷物体之间碰撞的结果。我们提出，通过观察冷水蒸气，这种区分可能成为可能。方法。我们进行了数量级分析，并将其与现有观察结果进行了比较。结果。我们表明，不同的假设会导致不同质量的水蒸气。这是因为，对于这两种假设，冷水蒸气的存在归因于星际紫外线辐射减弱对尘埃颗粒的光解吸。目前的天文设施无法观测到冷水蒸气，因为它的大部分发射线都在远红外（FIR）范围内。结论。这项工作突出了未来 FIR 太空天文台的必要性，以揭示碎片盘中气体的来源以及行星形成盘的一般演化。