Short- and Long-Period Planets around Evolved Stars

围绕演化恒星的短周期和长周期行星

• 批准号: 446158929
• 负责人: Professor Dr. Andreas Quirrenbach
• 金额: --
• 依托单位: Landessternwarte Königstuhl (LSW)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/446158929?language=en
• 关键词: Short; Long; Period; Planets; around

More than one hundred planets have been identified around giant stars in recent years, and thus the occurrence rate of planets in the period range of 1 to 3 years is reasonably well determined. However, there are only very few planets with periods of the order of weeks or longer than 10 years.We propose to specifically search for planets with short and long periods around giant stars, via radial velocity follow-up of TESS transiting planet candidates around evolved host stars on one side and via continued long-term radial velocity monitoring of systems which show indications for planets with periods of the order of 10 to 30 years on the other side. This will dramatically improve the occurrence rates for this so-far uncharted parameter space, and inform planet population synthesis studies. Furthermore, it will help to address differences in planet formation as a function of stellar mass (since the evolved samples are typically more massive than main-sequence samples), and also provide constraints on the evolution of planetary orbits under the influence of tides and stellar evolution by comparing main-sequence and evolved samples with the help of simulations.

近年来在巨星周围已发现一百多颗行星，因此1至3年周期范围内行星的出现率已相当确定。然而，只有极少数行星的周期为数周或长于10年。我们建议通过对围绕演化恒星周围的TESS凌日行星候选者的径向速度跟踪，专门寻找围绕巨星运行短周期和长周期的行星。一侧是恒星，通过对系统的持续长期径向速度监测，可以显示另一侧存在周期为 10 至 30 年的行星的迹象。这将极大地提高这个迄今为止未知的参数空间的发生率，并为行星人口综合研究提供信息。此外，它将有助于解决行星形成作为恒星质量函数的差异（因为演化的样本通常比主序样本质量更大），并且还为潮汐和恒星影响下的行星轨道演化提供约束。通过在模拟的帮助下比较主序和进化样本来进行进化。