The population of close binary hot subdwarfs studied with light curves from space telescopes

用太空望远镜的光变曲线研究了紧密双星热亚矮星的种群

• 批准号: 400079267
• 负责人: Professor Dr. Stephan Geier
• 金额: --
• 依托单位: Institut für Physik und Astronomie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/400079267?language=en
• 关键词: population; close; binary; hot; subdwarfs

Hot subdwarf stars (sdO/Bs) are the stripped cores of red-giant stars and are most likely formed via binary interactions. Close-binary subdwarfs show characteristic signatures in their light curves caused by eclipses, the reflection effect, the ellipsoidal deformation of the sdB primary or the very shallow relativistic Doppler boosting. However, ground-based light curve surveys are only sensitive to variations at the percent level and do not allow us to study the full population of close hot subdwarf binaries. Here we apply for a PostDoc postion to perform an analysis of all the 3200 sdO/B light curves obtained from space by the TESS mission as well as the 40000 light curves obtained by the Gaia mission. The classification of binary signatures will allow us to put meaningful constraints on the close binary properties of sdO/B stars. Furthermore, we will combine an analysis of the TESS light curves with spectroscopic parameters from literature for about 30 eclipsing and ellipsoidal variable sdB+WD binaries to determine their fundamental parameters.

热亚矮星（sdO/Bs）是红巨星的剥离核心，最有可能通过双星相互作用形成。近距离双星的次矮星在其光变曲线中显示出由食、反射效应、sdB主星的椭球变形或非常浅的相对论多普勒增强引起的特征签名。然而，地面光变曲线测量只对百分比水平的变化敏感，不允许我们研究近距离热亚矮星双星的全部人口。在这里，我们申请PostDoc职位，对TESS使命从太空获得的所有3200 sdO/B光变曲线以及盖亚使命获得的40000光变曲线进行分析。二进制签名的分类将使我们能够把有意义的限制上的密切的二进制属性的sdO/B星。此外，我们将结合联合收割机的TESS光变曲线的分析与光谱参数从文献中约30食和椭球变sdB + WD二进制文件，以确定其基本参数。