Transiting planets of intermediate-mass stars

中等质量恒星的凌日行星

• 批准号: 247814333
• 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: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/247814333?language=en
• 关键词: Transiting; planets; intermediate; mass; stars

In contrast to planets of solar-like stars, very little is known about planets of intermediate mass (1.3-2.1 Msun) stars. The interesting aspect is that the lifetime of the protoplanetary disks of these stars half as long as that of lower-mass stars.The detection of close-in planets thus sets strong constrains for the time-scale of the formation of planets, and the detection of close-in planets sets constrains on the formation and migration of planets. Thus, if we detect close-in planets of such stars we know the planets must have formed and migrated inwards within a short time. For our survey we selected transiting planet candidates with orbital periods of less than 4 days from the CoRoT-database. Our previous observations with the CAFÉ spectrograph showed that planets with Mplanet > 2 MJup can be detected with this instrument. However, these observations were severely effected by bad weather so that we did not obtain enough data in order to detect the planets. We thus applied again for observing time with the same instrument, and were awarded 4 nights in this semester. Once the survey is completed, we will know what frequency of close-in planets of such stars is, and whether they have on average a higher mass and density than planets of solar-like stars, as predicted by theory.

与类太阳恒星的行星相比，对中等质量（1.3-2.1 Msun）恒星的行星知之甚少。有趣的是，这些恒星的原行星盘的寿命只有低质量恒星的一半，因此，近距离行星的探测对行星形成的时间尺度有很强的约束，而近距离行星的探测对行星的形成和迁移有很强的约束。因此，如果我们探测到这些恒星附近的行星，我们知道这些行星一定是在很短的时间内形成并向内迁移的。在我们的调查中，我们从CoRoT数据库中选择了轨道周期小于4天的过境行星候选者。 我们之前用CAF 100摄谱仪的观测表明，Mplanet > 2 MJup的行星可以用这种仪器探测到。然而，这些观测受到恶劣天气的严重影响，因此我们没有获得足够的数据来探测行星。因此，我们再次申请用同一种仪器观察时间，并在本学期获得了4个晚上。一旦调查完成，我们将知道这些恒星的近距离行星的频率是多少，以及它们的平均质量和密度是否比理论预测的类似太阳的恒星的行星更高。