Macromolecular organic compounds from the depths of Enceladus.

Macromolecular organic compounds from the depths of Enceladus.
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DOI:
10.1038/s41586-018-0246-4
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发表时间:
2018-06
期刊:
影响因子:
64.8
通讯作者:
Waite JH
Waite JH
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Postberg F;Khawaja N;Abel B;Choblet G;Glein CR;Gudipati MS;Henderson BL;Hsu HW;Kempf S;Klenner F;Moragas-Klostermeyer G;Magee B;Nölle L;Perry M;Reviol R;Schmidt J;Srama R;Stolz F;Tobie G;Trieloff M;Waite JH

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土星的卫星土卫二拥有一个全球性的海洋,它位于冰壳之下,岩石核心之上。通过地壳中温暖的裂缝,低温火山羽流将冰粒和蒸汽送入太空,从而提供了获取源自海洋的物质的途径。热液活动被怀疑是发生在水膨胀的多孔核心深处,由潮汐消散提供动力。到目前为止,在羽流中只观察到分子量大多低于50 u的简单有机化合物。在这里,我们报告的观测排放冰粒含有浓缩,复杂,分子量超过200 u的大分子有机材料。这些数据提供了对大分子结构的关键限制,并暗示了海洋地下水位顶部的一层薄的富含有机物的膜。在那里,由气泡破裂产生的有机成核核心允许探测土卫二的有机库存,浓度大大提高。
Saturn’s moon Enceladus harbours a global ocean, which lies under an ice crust and above a rocky core. Through warm cracks in the crust a cryo-volcanic plume ejects ice grains and vapour into space, providing access to materials originating from the ocean. Hydrothermal activity is suspected to be occurring deep inside the water-percolated porous core, powered by tidal dissipation. So far only simple organic compounds with molecular masses mostly below 50u have been observed in the plume. Here we report observations of emitted ice grains containing concentrated, complex, macromolecular organic material with molecular masses above 200u. The data provides key constraints on the macromolecular structure and is suggestive of a thin organic-rich film on top of the oceanic water table. There, organic nucleation cores generated by bubble bursting allow probing of Enceladus’ organic inventory in drastically enhanced concentrations.
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