Studying the hot subdwarf population with Gaia

作为红巨星的核心，炽热的亚矮星被证明是恒星演化中特殊事件的重要标志，范围从恒星与行星的相互作用到用于测量我们宇宙膨胀的恒星爆炸的前身。随着盖亚任务的成功运行，恒星天体物理领域将很快进入一个新时代。非常罕见的热演化恒星领域将受益最大，因为已知天体的数量很快将增加一到两个数量级。因此，我们必须掌握从分析单个物体到描述整个物体群体的转变。在Tübingen和Bamberg的联合提议中，我们提出了一个博士后和两个博士职位，以编制这些天体的第一个全天星表，确定它们的基本参数和形成通道，研究以极快速度运行的热次矮星，并发现一类新的Ia型超新星的前体和被抛出的超高速伴星。

Being the stripped cores of red giants, hot subdwarf stars turned out to be important markers of peculiar events in stellar evolution ranging all the way from star-planet interactions to the progenitors of stellar explosions used to measure the expansion of our Universe. With the successful operation of the Gaia mission, the field of stellar astrophysics will soon enter into a new era. The field of hot, evolved stars, which are quite rare, will benefit most significantly because the number of known objects will soon rise by one or two orders of magnitude. Therefore we have to master the transition from analysing single objects to characterising whole populations of objects. In this joint proposal between Tübingen and Bamberg we propose one PostDoc and two PhD positions to compile the first all-sky catalogue of those objects, determine their fundamental parameters and formation channels, study the hot subdwarfs at extreme velocities, and find a new class of progenitors and ejected hypervelocity companions of type Ia supernovae.