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23 April 2024 |
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Oxygen Isotopic Composition of Coarse- and Fine-grained Material from Comet 81P/Wild 2 | | Ryan C. Ogliore
; Kazuhide Nagashima
; Gary R. Huss
; Andrew J. Westphal
; Zack Gainsforth
; Anna L. Butterworth
; | | Date: |
15 Jun 2015 | | Abstract: | Individual particles from comet 81P/Wild 2 collected by NASA’s Stardust
mission vary in size from small sub-$mu$m fragments found in the walls of the
aerogel tracks, to large fragments up to tens of $mu$m in size found towards
the termini of tracks. The comet, in an orbit beyond Neptune since its
formation, retains an intact a record of early-Solar-System processes that was
compromised in asteroidal samples by heating and aqueous alteration. We
measured the O isotopic composition of seven Stardust fragments larger than
$sim$2 $mu$m extracted from five different Stardust aerogel tracks, and 63
particles smaller than $sim$2 $mu$m from the wall of a Stardust track. The
larger particles show a relatively narrow range of O isotopic compositions that
is consistent with $^{16}$O-poor phases commonly seen in meteorites. Many of
the larger Stardust fragments studied so far have chondrule-like mineralogy
which is consistent with formation in the inner Solar System. The fine-grained
material shows a very broad range of O isotopic compositions
($-70<Delta^{17}$O$<+60$) suggesting that Wild 2 fines are either primitive
outer-nebula dust or a very diverse sampling of inner Solar System
compositional reservoirs that accreted along with a large number of
inner-Solar-System rocks to form comet Wild 2. | | Source: | arXiv, 1506.4783 | | Services: | Forum | Review | PDF | Favorites | |
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