67P/楚留莫夫-格拉希门克彗星中的氙同位素表明彗星对地球大气有贡献。
Xenon isotopes in 67P/Churyumov-Gerasimenko show that comets contributed to Earth's atmosphere.
机构信息
Centre de Recherches Pétrographiques et Géochimiques, CNRS, Université de Lorraine, 15 rue Notre Dame des Pauvres, BP 20, 54501 Vandoeuvre lès Nancy, France.
Physikalisches Institut, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland.
出版信息
Science. 2017 Jun 9;356(6342):1069-1072. doi: 10.1126/science.aal3496.
The origin of cometary matter and the potential contribution of comets to inner-planet atmospheres are long-standing problems. During a series of dedicated low-altitude orbits, the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) on the Rosetta spacecraft analyzed the isotopes of xenon in the coma of comet 67P/Churyumov-Gerasimenko. The xenon isotopic composition shows deficits in heavy xenon isotopes and matches that of a primordial atmospheric component. The present-day Earth atmosphere contains 22 ± 5% cometary xenon, in addition to chondritic (or solar) xenon.
彗星物质的起源以及彗星对内行星大气的潜在贡献是长期存在的问题。在一系列专门的低空轨道中，罗塞塔号飞船上的罗塞塔离子和中性分析轨道器（ROSINA）分析了 67P/楚留莫夫-格拉希门克彗星彗发中的氙同位素。氙的同位素组成显示重氙同位素亏损，与原始大气成分相匹配。现今地球大气中含有 22±5%的彗星氙，此外还有球粒陨石（或太阳）氙。
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