Department of Physics and Astronomy, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4 Canada.
Phys Rev Lett. 2011 Oct 7;107(15):151103. doi: 10.1103/PhysRevLett.107.151103. Epub 2011 Oct 6.
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.
富含钛的亚光度超新星很罕见，这对当前的 SN 核合成模型提出了挑战。我们提出了一个模型，其中标准超新星的喷出物受到中子星（夸克星 nova）的第二次爆炸的冲击，导致在适当的条件下，散裂反应导致（56）Ni 的破坏和（44）Ti 的产生。散裂产物的基本计算表明，两次爆炸之间的延迟约为 5 天，可以再现 Cas A 中观测到的（44）Ti 的丰度，并解释了由于（56）Ni 的破坏导致其低光度的原因。我们的结果可能对亚光度和超光度超新星的光度曲线有重要影响。
