椭圆星：来自扁平恒星的环状爆炸
Ellipsars: Ring-like explosions from flattened stars
摘要：
长期以来，产生天文瞬变的恒星灾变一直被模拟为在球对称恒星中心点燃的点状爆炸或喷射式发动机。然而，许多恒星被观测到，或者在理论上被预期，不是精确的球对称，而是有一个稍微扁平的几何形状，类似于扁球体。在这里，我们提出了轴对称的二维流体动力学模拟的动力学点样爆炸的中心，一个非球面的大质量恒星的扁率范围。我们把这些爆炸的非球面恒星称为“椭圆星”，因为在二维轴对称的情况下，它们的祖先的等密度轮廓是椭圆形的。我们发现椭圆星能够加速相对论喷出物的膨胀环，这可能导致天文瞬变的产生，包括低光度GRB，相对论超新星和快蓝光学瞬变（FBOTs）。
英文摘要：
The stellar cataclysms producing astronomical transients have long been modeled as either a point-like explosion or jet-like engine ignited at the center of a spherically symmetric star. However, many stars are observed, or are expected on theoretical grounds, not to be precisely spherically symmetric, but rather to have a slightly flattened geometry similar to that of an oblate spheroid. Here we present axisymmetric two-dimensional hydrodynamical simulations of the dynamics of point-like explosions initiated at the center of an aspherical massive star with a range of oblateness. We refer to these exploding aspherical stars as "ellipsars" in reference to the elliptical shape of the iso-density contours of their progenitors in the two-dimensional axisymmetric case. We find that ellipsars are capable of accelerating expanding rings of relativistic ejecta which may lead to the production of astronomical transients including low-luminosity GRBs, relativistic supernovae, and Fast Blue Optical Transients (FBOTs.)
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
