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Graphite grains in supernova ejecta - Insights from a noble gas study of 91 individual KFC1 presolar graphite grains from the Murchison meteorite

Meier, Matthias LU ; Heck, P. R.; Amari, S.; Baur, H. and Wieler, R. (2012) In Geochimica et Cosmochimica Acta 76. p.147-160
Abstract
We have measured helium and neon concentrations, elemental and isotopic ratios of 91 individual presolar graphite grains from the KFC1 density separate of the Murchison meteorite. Eleven grains contain measurable amounts of either (4)He, (20)Ne, (21)Ne or (22)Ne, or a combination thereof. We report the first detection of (21)Ne from an individual presolar graphite grain and the first detection of (4)He and (20)Ne in individual KFC1 graphite grains. Six of the gas-rich grains originate from asymptotic giant branch (AGB) stars, while another five are likely derived from core-collapse supernovae. The mono-isotopic (22)Ne detected in one supernova grain is either radiogenic and compatible with condensation in the O/Ne zone, or nucleosynthetic... (More)
We have measured helium and neon concentrations, elemental and isotopic ratios of 91 individual presolar graphite grains from the KFC1 density separate of the Murchison meteorite. Eleven grains contain measurable amounts of either (4)He, (20)Ne, (21)Ne or (22)Ne, or a combination thereof. We report the first detection of (21)Ne from an individual presolar graphite grain and the first detection of (4)He and (20)Ne in individual KFC1 graphite grains. Six of the gas-rich grains originate from asymptotic giant branch (AGB) stars, while another five are likely derived from core-collapse supernovae. The mono-isotopic (22)Ne detected in one supernova grain is either radiogenic and compatible with condensation in the O/Ne zone, or nucleosynthetic and derived from the He/C zone. Two grains with (20)Ne and (12)C/(13)C < 10 are consistent with condensation and Ne acquisition in a similar to 80:20 mixture of material from the H envelope and He/N zone. The isotopic ratios of a single grain with (21)Ne and (22)Ne, and a further grain with (20)Ne and (22)Ne are compatible with condensation and Ne acquisition in the C/O zone. We discuss the implications of our study on the understanding of processes in supernova ejecta. (C) 2011 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Geochimica et Cosmochimica Acta
volume
76
pages
147 - 160
publisher
Elsevier
external identifiers
  • wos:000298148700010
  • scopus:84855909974
ISSN
0016-7037
DOI
10.1016/j.gca.2011.10.027
language
English
LU publication?
yes
id
c556eef5-8496-4698-ae0e-c5ffd63581b1 (old id 2333621)
date added to LUP
2012-02-02 14:31:26
date last changed
2017-01-01 03:47:47
@article{c556eef5-8496-4698-ae0e-c5ffd63581b1,
  abstract     = {We have measured helium and neon concentrations, elemental and isotopic ratios of 91 individual presolar graphite grains from the KFC1 density separate of the Murchison meteorite. Eleven grains contain measurable amounts of either (4)He, (20)Ne, (21)Ne or (22)Ne, or a combination thereof. We report the first detection of (21)Ne from an individual presolar graphite grain and the first detection of (4)He and (20)Ne in individual KFC1 graphite grains. Six of the gas-rich grains originate from asymptotic giant branch (AGB) stars, while another five are likely derived from core-collapse supernovae. The mono-isotopic (22)Ne detected in one supernova grain is either radiogenic and compatible with condensation in the O/Ne zone, or nucleosynthetic and derived from the He/C zone. Two grains with (20)Ne and (12)C/(13)C &lt; 10 are consistent with condensation and Ne acquisition in a similar to 80:20 mixture of material from the H envelope and He/N zone. The isotopic ratios of a single grain with (21)Ne and (22)Ne, and a further grain with (20)Ne and (22)Ne are compatible with condensation and Ne acquisition in the C/O zone. We discuss the implications of our study on the understanding of processes in supernova ejecta. (C) 2011 Elsevier Ltd. All rights reserved.},
  author       = {Meier, Matthias and Heck, P. R. and Amari, S. and Baur, H. and Wieler, R.},
  issn         = {0016-7037},
  language     = {eng},
  pages        = {147--160},
  publisher    = {Elsevier},
  series       = {Geochimica et Cosmochimica Acta},
  title        = {Graphite grains in supernova ejecta - Insights from a noble gas study of 91 individual KFC1 presolar graphite grains from the Murchison meteorite},
  url          = {http://dx.doi.org/10.1016/j.gca.2011.10.027},
  volume       = {76},
  year         = {2012},
}