Titanium and Iron in the Cassiopeia A Supernova Remnant

Abstract

Mixing above the proto-neutron star is believed to play an important role in the supernova engine, and this mixing results in a supernova explosion with asymmetries. Elements produced in the innermost ejecta, e.g., ${}^{56}$Ni and ${}^{44}$Ti, provide a clean probe of this engine. The production of ${}^{44}$Ti is particularly sensitive to the exact production pathway and, by understanding the available pathways, we can use ${}^{44}$Ti to probe the supernova engine. Using thermodynamic trajectories from a three-dimensional supernova explosion model, we review the production of these elements and the structures expected to form under the "convective-engine" paradigm behind supernovae. We compare our results to recent X-ray and $\gamma$-ray observations of the Cassiopeia A supernova remnant.

v1: 14 pages of text, 24 figures, 2 tables; to be published in ApJ

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Cited by in corpus (4)

• High-entropy ejecta plumes in Cassiopeia A from neutrino-driven convection
• Reaction Rate Sensitivity of the Production of $\gamma$-ray Emitting Isotopes in Core-Collapse Supernova
• Discovery of Stable Titanium at the Northeastern Jet of Cassiopeia A: Need for a Weak Jet Mechanism?
• Three-dimensional Supernova Models Provide New Insights into the Origins of Stardust