星尘号返回的81P/怀尔德2号彗星样本的红外光谱分析。

Infrared spectroscopy of comet 81P/Wild 2 samples returned by Stardust.

作者信息

Keller Lindsay P, Bajt Sasa, Baratta Giuseppe A, Borg Janet, Bradley John P, Brownlee Don E, Busemann Henner, Brucato John R, Burchell Mark, Colangeli Luigi, d'Hendecourt Louis, Djouadi Zahia, Ferrini Gianluca, Flynn George, Franchi Ian A, Fries Marc, Grady Monica M, Graham Giles A, Grossemy Faustine, Kearsley Anton, Matrajt Graciela, Nakamura-Messenger Keiko, Mennella Vito, Nittler Larry, Palumbo Maria E, Stadermann Frank J, Tsou Peter, Rotundi Alessandra, Sandford Scott A, Snead Christopher, Steele Andrew, Wooden Diane, Zolensky Mike

机构信息

Astromaterials Research and Exploration Science Directorate, Mail Code KR, NASA-Johnson Space Center, Houston, TX 77058, USA.

出版信息

Science. 2006 Dec 15;314(5806):1728-31. doi: 10.1126/science.1135796.

DOI:10.1126/science.1135796

PMID:17170293

Abstract

Infrared spectra of material captured from comet 81P/Wild 2 by the Stardust spacecraft reveal indigenous aliphatic hydrocarbons similar to those in interplanetary dust particles thought to be derived from comets, but with longer chain lengths than those observed in the diffuse interstellar medium. Similarly, the Stardust samples contain abundant amorphous silicates in addition to crystalline silicates such as olivine and pyroxene. The presence of crystalline silicates in Wild 2 is consistent with mixing of solar system and interstellar matter. No hydrous silicates or carbonate minerals were detected, which suggests a lack of aqueous processing of Wild 2 dust.

摘要

星尘号航天器从81P/怀尔德2号彗星捕获的物质的红外光谱显示，其原生脂肪族碳氢化合物与被认为源自彗星的行星际尘埃颗粒中的类似，但链长比在弥漫星际介质中观察到的更长。同样，星尘号样本除了含有诸如橄榄石和辉石之类的结晶硅酸盐外，还含有大量无定形硅酸盐。怀尔德2号彗星中结晶硅酸盐的存在与太阳系物质和星际物质的混合情况相符。未检测到含水硅酸盐或碳酸盐矿物，这表明怀尔德2号彗星尘埃缺乏水合过程。