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<p>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 H<sub>2</sub>O reservoirs within the Solar System. Here we present interferometric maps of water (H<sub>2</sub>O) 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 H<sub>2</sub>O and HDO directly from the nucleus, and they imply a coma D/H ratio (for water) of (1.71 ± 0.44) × 10<sup>−4</sup>. 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.</p>

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

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • 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

摘要

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.