[meteorite-list] FIRST LABORATORY OBSERVATION OF SILICA GRAINS FROM CORE COLLAPSE SUPERNOVAE

From: Shawn Alan <photophlow_at_meteoritecentral.com>
Date: Sat, 20 Apr 2013 22:36:29 -0700 (PDT)
Message-ID: <1366522589.70610.YahooMailNeo_at_web162602.mail.bf1.yahoo.com>

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Hello Hello
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For all of you science meteorite geeks, I came across this abstract about SUPERNOVAE grains :)
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Shawn Alan
IMCA 1633
ebay store
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The Astrophysical Journal LettersVolume 768 Number 1
Pierre Haenecour et al. 2013 ApJ 768 L17 doi:10.1088/2041-8205/768/1/L17
FIRST LABORATORY OBSERVATION OF SILICA GRAINS FROM CORE COLLAPSE SUPERNOVAE
Pierre Haenecour1,2,4, Xuchao Zhao3, Christine Floss1, Yangting Lin3, and Ernst Zinner1,2Show affiliations
haenecour at wustl.edu
1 Laboratory for Space Sciences, McDonnell Center for the Space Sciences and Physics Department, Washington University, One Brookings Drive, St. Louis, MO 63130-4899, USA
2 Department of Earth and Planetary Sciences, Washington University, One Brookings Drive, St. Louis, MO 63130-4899, USA
3 Key Laboratory of the Earth's Deep Interior, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
4 Author to whom any correspondence should be addressed.

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2041-8205/768/1/L17
10.1088/2041-8205/768/1/L17
false
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We report the discovery of two supernova silica (SiO2) grains in the primitive carbonaceous chondrites LaPaZ 031117 and Grove Mountains 021710. Only five presolar silica grains have been previously reported from laboratory measurements but they all exhibit enrichments in 17O relative to solar, indicating origins in the envelopes of asymptotic giant branch stars. The two SiO2 grains identified in this study are characterized by moderate enrichments in 18O relative to solar, indicating that they originated in Type II supernova ejecta. If compared to theoretical models, the oxygen isotopic compositions of these grains can be reproduced by mixing of different supernova zones. While both theoretical models of grain condensation and recent NASA Spitzer Space Telescope observations have suggested the presence of silica in supernova ejecta, no such grains had been identified, until now, in meteorites. The discovery of these two silica grains provides definitive
 evidence of the condensation of silica dust in supernova ejecta.
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source:http://iopscience.iop.org/2041-8205/768/1/L17?fromSearchPage=true
Received on Sun 21 Apr 2013 01:36:29 AM PDT