A Spallation Model for the Titanium-rich Supernova Remnant Cassiopeia A

Details A Spallation Model for the Titanium-rich Supernova Remnant Cassiopeia A A Spallation Model for the Titanium-rich Supernova Remnant Cassiopeia A

2011-09-09

arxiv.org/abs/1109.2124v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Accepted/to be published in Physical Review Letters. [ for more info on the Quark Nova, see: http://quarknova.ucalgary.ca/ ]

Scientific paper

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 56Ni destruction and 44Ti 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 44Ti in Cas A and explains its low luminosity as a result of the destruction of 56Ni. Our results could have important implications for lightcurves of subluminous as well as superluminous supernovae.

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