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重要性，但它们的祖先和确切的爆炸机制都不为人所知。几个祖先类，都涉及一个吸积白色矮星（WD），已被提出。然而，只有很少的对象满足预测的标准已被发现。其中WD双星与氦星星（热亚矮星）的同伴脱颖而出，因为四个很好的祖先候选人的两种可能的SN的情况下，也候选人的幸存者和随后弹出的同伴，这样的爆炸已被发现。在这里，我们提出了一个项目来研究涉及He-恒星的SN Ia的祖星和被弹射的伴星种群，以限制爆炸机制，并评估这些通道对所观察到的银河系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.