48Ca HETEROGENEITY IN DIFFERENTIATED METEORITES

Hsin-Wei Chen, Typhoon Lee, Der-Chuen Lee, Jason Jiun-San Shen, Jiang-Chang Chen
2011 Astrophysical Journal Letters  
Isotopic heterogeneities of 48 Ca have been found in numerous bulk meteorites that are correlated with 50 Ti and 54 Cr anomalies among differentiated planetary bodies, and the results suggest that a rare subset of neutron-rich Type Ia supernova (nSN Ia) was responsible for contributing these neutron-rich iron-group isotopes into the solar system (SS). The heterogeneity of these isotopes found in differentiated meteorites indicates that the isotopic compositions of the bulk SS are not uniform,
more » ... are not uniform, and there are significant amounts of nSNe Ia dust incompletely mixed with the rest of SS materials during planetary formation. Combined with the data of now-extinct short-lived nuclide 60 Fe, which can be produced more efficiently from an nSN Ia than a Type II supernova ejecta, the observed planetary-scale isotopic heterogeneity probably reflects a late input of stellar dust grains with neutron-rich nuclear statistical equilibrium nuclides into the early SS.
doi:10.1088/2041-8205/743/1/l23 fatcat:cym5qfm2g5eytpad5o3rr5y2ji