Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...681l.105s&link_type=abstract
The Astrophysical Journal, Volume 681, Issue 2, pp. L105-L108.
Astronomy and Astrophysics
Astronomy
7
Comets: General, Comets: Individual (Wild 2), Kuiper Belt, Oort Cloud
Scientific paper
Microstructural studies by transmission electron microscope (TEM) techniques of a microtomed cometary enstatite (Mg/Si 0.858; Fe/Si 0.027; Ca/Si 0.01; Al/Si 0.009; Cr/Si 0.01) from Wild 2 sampled during NASA's Stardust mission were conducted. The enstatite is characterized by high stacking disorder parallel (100) which includes alternating clinoenstatite (CLEN) and orthoenstatite (OREN) lamellae and (100) twins. In addition a widespread occurrence of 4.5 Å wide half-planes parallel (100) are detected, which leads to 13.5 and 22.5 Å polytypes of the structure. These microstructural features are indicative of the direct transformation from a protoenstatite (PEN) precursor, which requires temperatures of more than 1275 K and rapid cooling (>10 K hr-1). Our finding represents a further high-temperature component originally present in the cold icy region where comet Wild 2 was formed.
Brenker Frank E.
Schmitz Sylvia
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