White dwarf collisions and the meteoritic Ne-E anomaly

Abstract

The analysis of noble gases in primitive meteorites has shown the existence of anomalous isotopic abundances when compared with the average Solar System values. In particular it has been found that some graphite grains contain an unexpected high abundance of neon-22. This excess of neon- 22 is usually attributed to the radioactive decay of sodium-22 produced in the O/Ne burning layer of a core collapse supernova. In this talk we speculate about a different origin, the disruption of a crystallized white dwarf by a compact object (white dwarf, neutron star, or black hole).