Studying the hot subdwarf population with Gaia

作为红巨星的剥离核心，热亚矮星被证明是恒星演化中特殊事件的重要标志，从恒星-行星相互作用到用于测量我们宇宙膨胀的恒星爆炸的前身。随着盖亚使命的成功运行，恒星天体物理学领域将很快进入一个新的时代。非常罕见的热的、演化的恒星领域将受益最大，因为已知物体的数量很快就会增加一到两个数量级。因此，我们必须掌握从分析单个对象到表征整个对象群体的过渡。在图宾根和班贝格的这项联合提案中，我们提议设立一个博士后职位和两个博士职位，以编制这些物体的第一个全天空目录，确定它们的基本参数和形成通道，研究极端速度下的热亚矮星，并找到一类新的祖先和Ia型超新星的喷射超高速伴星。

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.