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Title: New Constraints on the Abundance of 60Fe in the Early Solar System

Abstract

Establishing the abundance of the extinct radionuclide 60Fe (half-life 2.62 Ma) in the early solar system is important for understanding the astrophysical context of solar system formation. While bulk measurements of early solar system phases show a low abundance consistent with galactic background, some in situ measurements by secondary ion mass spectrometry (SIMS) imply a higher abundance, which would require injection from a nearby supernova (SN). In this paper, we present in situ nickel isotopic analyses by resonance ionization mass spectrometry (RIMS) in a chondrule from the primitive meteorite Semarkona (LL3.00). The same chondrule had been previously analyzed by SIMS. Despite improved precision compared to SIMS, the RIMS nickel isotopic data do not reveal any resolved excesses of 60Ni that could be unambiguously ascribed to in situ 60Fe decay. Linear regression of 60Ni/ 58Ni versus 56Fe/ 58Ni yields an initial 60Fe/ 56Fe ratio for this chondrule of (3.8 ± 6.9) × 10 -8, which is consistent with both the low initial value found by bulk measurements and the low end of the range of initial ratios inferred from some in situ work. The same regression also gives a solar initial 60Ni/ 58Ni ratio, which shows that this sample was notmore » disturbed by nickel mobilization, thus agreeing with a low initial 60Fe/ 56Fe ratio. These findings agree with a re-evaluation of previous SIMS measurements of the same sample. Finally, supernova injection of 60Fe into the solar system or its parental cloud material is therefore not necessary to account for the measured solar system's initial amount of 60Fe.« less

Authors:
ORCiD logo [1];  [2]; ORCiD logo [2];  [3];  [1];  [2]; ORCiD logo [4];  [4];  [5];  [6]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division
  2. Univ. of Chicago, IL (United States). Dept. of the Geophysical Sciences; Chicago Center for Cosmochemistry, IL (United States)
  3. Univ. of California, Santa Cruz, CA (United States). Earth and Planetary Sciences
  4. Univ. of Chicago, IL (United States). Dept. of the Geophysical Sciences. Enrico Fermi Inst.; Chicago Center for Cosmochemistry, IL (United States)
  5. Univ. of Chicago, IL (United States). Dept. of the Geophysical Sciences. Enrico Fermi Inst.; Chicago Center for Cosmochemistry, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  6. Univ. of Hawaii, Honolulu, HI (United States). Hawai'i Inst. of Geophysics and Planetology. School of Ocean, Earth Science and Technology
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Chicago, IL (United States); Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Org.:
USDOE; LLNL Laboratory Directed Research and Development (LDRD) Program; National Aeronautic and Space Administration (NASA); National Science Foundation (NSF)
OSTI Identifier:
1438675
Report Number(s):
LLNL-JRNL-740364
Journal ID: ISSN 2041-8213
Grant/Contract Number:  
AC52-07NA27344; NNX15AF78G; 80NSSC17K0250; 80NSSC17K0251; NNX17AE86G; NNX17AE87G; NNX15AJ25G; NNX11AG78G; NNX14AI19G; EAR1502591; EAR1444951
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters
Additional Journal Information:
Journal Volume: 857; Journal Issue: 2; Journal ID: ISSN 2041-8213
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; meteorites; meteors; meteoroids; protoplanetary disks; Sun; abundances

Citation Formats

Trappitsch, Reto, Boehnke, Patrick, Stephan, Thomas, Telus, Myriam, Savina, Michael R., Pardo, Olivia, Davis, Andrew M., Dauphas, Nicolas, Pellin, Michael J., and Huss, Gary R. New Constraints on the Abundance of 60Fe in the Early Solar System. United States: N. p., 2018. Web. doi:10.3847/2041-8213/aabba9.
Trappitsch, Reto, Boehnke, Patrick, Stephan, Thomas, Telus, Myriam, Savina, Michael R., Pardo, Olivia, Davis, Andrew M., Dauphas, Nicolas, Pellin, Michael J., & Huss, Gary R. New Constraints on the Abundance of 60Fe in the Early Solar System. United States. doi:10.3847/2041-8213/aabba9.
Trappitsch, Reto, Boehnke, Patrick, Stephan, Thomas, Telus, Myriam, Savina, Michael R., Pardo, Olivia, Davis, Andrew M., Dauphas, Nicolas, Pellin, Michael J., and Huss, Gary R. Thu . "New Constraints on the Abundance of 60Fe in the Early Solar System". United States. doi:10.3847/2041-8213/aabba9.
@article{osti_1438675,
title = {New Constraints on the Abundance of 60Fe in the Early Solar System},
author = {Trappitsch, Reto and Boehnke, Patrick and Stephan, Thomas and Telus, Myriam and Savina, Michael R. and Pardo, Olivia and Davis, Andrew M. and Dauphas, Nicolas and Pellin, Michael J. and Huss, Gary R.},
abstractNote = {Establishing the abundance of the extinct radionuclide 60Fe (half-life 2.62 Ma) in the early solar system is important for understanding the astrophysical context of solar system formation. While bulk measurements of early solar system phases show a low abundance consistent with galactic background, some in situ measurements by secondary ion mass spectrometry (SIMS) imply a higher abundance, which would require injection from a nearby supernova (SN). In this paper, we present in situ nickel isotopic analyses by resonance ionization mass spectrometry (RIMS) in a chondrule from the primitive meteorite Semarkona (LL3.00). The same chondrule had been previously analyzed by SIMS. Despite improved precision compared to SIMS, the RIMS nickel isotopic data do not reveal any resolved excesses of 60Ni that could be unambiguously ascribed to in situ 60Fe decay. Linear regression of 60Ni/58Ni versus 56Fe/58Ni yields an initial 60Fe/56Fe ratio for this chondrule of (3.8 ± 6.9) × 10-8, which is consistent with both the low initial value found by bulk measurements and the low end of the range of initial ratios inferred from some in situ work. The same regression also gives a solar initial 60Ni/58Ni ratio, which shows that this sample was not disturbed by nickel mobilization, thus agreeing with a low initial 60Fe/56Fe ratio. These findings agree with a re-evaluation of previous SIMS measurements of the same sample. Finally, supernova injection of 60Fe into the solar system or its parental cloud material is therefore not necessary to account for the measured solar system's initial amount of 60Fe.},
doi = {10.3847/2041-8213/aabba9},
journal = {The Astrophysical Journal. Letters},
number = 2,
volume = 857,
place = {United States},
year = {Thu Apr 19 00:00:00 EDT 2018},
month = {Thu Apr 19 00:00:00 EDT 2018}
}

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