来自ALMA HDO的哈雷彗星12P的A D/H比值与地球上的水一致

IF 14.3 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Nature Astronomy Pub Date : 2025-08-08 DOI:10.1038/s41550-025-02614-7

M. A. Cordiner, E. L. Gibb, Z. Kisiel, N. X. Roth, N. Biver, D. Bockelée-Morvan, J. Boissier, B. P. Bonev, S. B. Charnley, I. M. Coulson, J. Crovisier, M. N. Drozdovskaya, K. Furuya, M. Jin, Y.-J. Kuan, M. Lippi, D. C. Lis, S. N. Milam, C. Opitom, C. Qi, A. J. Remijan

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引用次数: 0

摘要

太阳系天体的同位素测量为理解行星物质的起源和历史提供了一个主要范例。氘氢比（D/H）特别有助于揭示太阳系内不同水储集层之间的关系（和遗产）。在这里，我们展示了一颗彗星（哈雷型彗星12P/ Pons-Brooks）气相昏迷中水（H2O）和半重水（HDO）的干涉图，这些图是用阿塔卡马大型毫米/亚毫米阵列获得的。这些图与H2O和HDO直接从原子核放出相一致，它们暗示了彗发的D/H比（对于水）为（1.71±0.44）× 10−4。这是以前在彗星中观测到的数值范围的下限，与地球海水的D/H一致。我们的研究结果表明，奥尔特云中的水冰储层的一个组成部分与太阳系早期历史中输送到年轻地球的水之间可能存在共同的遗产。

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A D/H ratio consistent with Earth’s water in Halley-type comet 12P from ALMA HDO mapping

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A D/H ratio consistent with Earth’s water in Halley-type comet 12P from ALMA HDO mapping

Isotopic measurements of Solar System bodies provide a primary paradigm within which to understand the origins and histories of planetary materials. The deuterium-to-hydrogen (D/H) ratio, in particular, helps reveal the relationship between (and heritage of) different H₂O reservoirs within the Solar System. Here we present interferometric maps of water (H₂O) and semiheavy water (HDO) in the gas-phase coma of a comet (Halley-type comet 12P/Pons–Brooks), obtained using the Atacama Large Millimeter/submillimeter Array. The maps are consistent with outgassing of both H₂O and HDO directly from the nucleus, and they imply a coma D/H ratio (for water) of (1.71 ± 0.44) × 10⁻⁴. This is at the lower end of the range of previously observed values in comets and is consistent with D/H in Earth’s ocean water. Our results indicate a possible common heritage between a component of the water ice reservoir in the Oort cloud and the water that was delivered to the young Earth during the early history of the Solar System.

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来源期刊

Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics

CiteScore

19.50

自引率

2.80%

发文量

252

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