title: Spallation model for the titanium-rich supernova remnant cassiopeia A.
abstract: Titanium-rich subluminous supernovae are rare and challenge current SN nucleosynthesis models. We present a model in which ejecta from a standard supernova is impacted by a second explosion of the neutron star (a quark nova), resulting in spallation reactions that lead to (56)Ni destruction and (44)Ti creation under the right conditions. Basic calculations of the spallation products shows that a delay between the two explosions of ∼5  days reproduces the observed abundance of (44)Ti in Cas A and explains its low luminosity as a result of the destruction of (56)Ni. Our results could have important implications for light curves of subluminous as well as superluminous supernovae.
authors: Department of Physics and Astronomy, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4 Canada.
authors: Rachid
authors: R
authors: Ouyed
authors: Denis
authors: D
authors: Leahy
authors: Amir
authors: A
authors: Ouyed
authors: Prashanth
authors: P
authors: Jaikumar