Titanium Isotopes in CAIs - Heterogeneities in the early solar system

Calcium-rich-Aluminum-rich refractory inclusions are considered to be the first objects yet identified that formed in the solar system. It is now established that most (but not all) of them contain nucleosynthetic anomalies from e-, p-, r-, and/or s-processes. Exactly how and when these heterogeneities in the dust that formed the solar system were established is not yet clear. For a better understanding of the origin of isotope heterogeneities in early solar system objects, studies of correlated anomalies are of great importance. As an example, it has been demonstrated for CAIs from Allende and Efremovka that excesses of the n-rich isotopes Ni and Zr are correlated [1]. In the same study the authors also found correlated Ni and Fe anomalies, suggesting that the n-rich stellar event not only delivered Ni and Zr but also some of the short-lived radionuclides. If true, this would yield useful informations about the timing of the events leading to the formation of the solar system. Here we report Ti isotope data for the same CAIs measured already for Ni [1] and Zr isotopes [2].