We perform hydrodynamical calculations of core-collapse supernovae (SNe) with low explosion energies. These SNe do not have enough energy to eject the whole progenitor and most of the progenitor falls back to the central remnant. We show that such fallback SNe can have a variety of light curves (LCs) but their photospheric velocities can only have some limited values with lower limits. We also perform calculations of nucleosynthesis and LCs of several fallback SN models, and find that a fallback SN from the progenitor with a main-sequence mass of 13 M ☉ can account for the properties of the peculiar Type Ia supernova SN 2008ha. The kinetic energy and ejecta mass of the model are 1.2 × 1048?erg and 0.074 M ☉, respectively, and the ejected 56Ni mass is 0.003 M ☉. Thus, SN 2008ha can be a core-collapse SN with a large amount of fallback. We also suggest that SN 2008ha could have been accompanied by long gamma-ray bursts, and long gamma-ray bursts without associated SNe may be accompanied by very faint SNe with significant amount of fallback, which are similar to SN 2008ha.
展开▼
机译：我们执行具有低爆炸能量的核塌陷超新星（SNe）的流体力学计算。这些SNe没有足够的能量来弹出整个祖细胞，并且大多数祖细胞回落到中央残留物。我们表明，这种后备SNe可以具有多种光曲线（LC），但它们的光球速度只能具有一些较低的极限值。我们还对几种后备SN模型进行了核合成和LC的计算，发现来自祖先的后备SN具有13 M main的主序列质量，可以解释Ia型超新星SN 2008ha的特性。该模型的动能和喷射质量分别为1.2×1048？erg和0.074 M☉，喷射的56Ni质量为0.003 M☉。因此，SN 2008ha可以是具有大量回退的核心崩溃SN。我们还建议SN 2008ha可能伴有长伽马射线暴，而没有相关SNe的长伽马射线暴可能伴有非常微弱的SNe并具有大量回退，这与SN 2008ha相似。
展开▼
