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Infrared spectroscopy of comet 81P/Wild 2 samples returned by Stardust |
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| Authors: | 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 |
| Institution: | Astromaterials Research and Exploration Science Directorate, Mail Code KR, NASA-Johnson Space Center, Houston, TX 77058, USA. lindsay.p.keller@nasa.gov |
| 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. |
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