Progenitors and ejected companions of thermonuclear supernovae

尽管Ia型热核超新星（SN Ia）对天体物理学和宇宙学具有全球性的重要性，但它们的起源和确切的爆炸机制都不为人所知。已经提出了几个祖类，都涉及一个吸积白矮星（WD）。然而，只有很少的天体符合预测的标准被发现。其中，有氦星（热亚矮星）伴星的WD双星尤为突出，因为已经发现了两种可能的SN情景的四个良好的候选祖先，以及这些爆炸幸存下来并随后被抛出的伴星的候选祖先。在此，我们提出了一个项目，研究SN Ia的祖先和涉及he -恒星的喷射伴星群，以限制爆炸机制，并评估这些通道对观测到的银河系SN Ia速率的贡献。

Despite the global importance of thermonuclear supernovae type Ia (SN Ia) for astrophysics and cosmology, neither their progenitors nor the exact explosion mechanisms are known. Several progenitor classes, all involving an accreting white dwarf (WD), have been proposed. However, only very few objects fullfilling the predicted criteria have been discovered. Among them WD binaries with helium star (hot subdwarf) companions stand out, because four good progenitor candidates for two possible SN scenarios and also candidates for the surviving and subsequently ejected companions of such explosions have been discovered. Here we propose a project to study both the progenitor and the ejected companion populations of SN Ia involving He-stars to put constraints on the explosion mechanism and assess the contribution of those channels to the observed Galactic SN Ia rate.