Transiting planets of intermediate-mass stars

中等质量恒星的凌日行星

• 批准号: 230668157
• 负责人: Dr. Eike W. Guenther
• 金额: --
• 依托单位: Thüringer Landessternwarte Tautenburg (TLS) - Karl-Schwarzschild-Observatorium
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/230668157?language=en
• 关键词: Transiting; planets; intermediate; mass; stars

In contrast to planets of solar-like stars, very little is known about close-in planets of intermediate mass stars (1.3-2.1 Msun). The detection of a (several) close-in planet(s) of main-sequence stars of intermediate-mass would show that the formation and migration time of planets must be short, because the life time of the proto-planetary disks of such stars is short. It would also allow us to find out whether planets of such stars have different properties than planets of solar like stars (e.g. higher mass, higher density), as predicted by theory of planet-formation. We focus on transiting planet-candidates discovered by CoRoT with orbital periods less than 4 days. A feasibility study with the shows that it is possible to detect planets with masses greater than 2 MJup around these types of stars.In order to study transiting planets of intermediate-mass stars, we have analyzed high-precision light-curves obtained with the CoRoT-satellite. After identifying suitable candidates, we carried out a first observing run using the 2.1-m telescope at McDonald observatory. These observations showed that it is possible to measure the radial-velocity of intermediate-mass stars and we identified suitable candidates. We then submitted a proposal to the Spanish-German-astronomical centre (DSAZ) in order to observe these objects with a higher precision with the new Cafe-echelle spectrograph mounted on the 2.2-m telescope.

与类太阳恒星的行星相比，我们对中等质量恒星（1.3-2.1 Msun）的近距离行星知之甚少。如果探测到一颗（几颗）靠近中等质量主序星的行星，就表明行星的形成和迁移时间一定很短，因为这类恒星的原行星盘的寿命很短。这也将使我们能够发现这些恒星的行星是否具有与太阳类恒星的行星不同的性质（例如更高的质量，更高的密度），正如行星形成理论所预测的那样。我们专注于过境行星候选人发现的CoRoT轨道周期小于4天。一项可行性研究表明，有可能在这些类型的恒星周围探测到质量大于2兆焦耳的行星。为了研究中等质量恒星的凌日行星，我们分析了CoRoT卫星获得的高精度光变曲线。在确定了合适的候选者之后，我们使用麦克唐纳天文台的2.1米望远镜进行了第一次观测。这些观测表明，测量中等质量恒星的径向速度是可能的，我们确定了合适的候选者。然后，我们向西班牙-德国天文中心提出了一项建议，以便用安装在2.2米望远镜上的新的咖啡阶梯光栅摄谱仪以更高的精度观测这些物体。