Hello Hello
For all of you science meteorite geeks, I came across this abstract about
SUPERNOVAE grains :)
Shawn Alan
IMCA 1633
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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
[email protected]
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.
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.
source:http://iopscience.iop.org/2041-8205/768/1/L17?fromSearchPage=true
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