Transiting planets of intermediate-mass stars

与类太阳恒星的行星相比，人们对中等质量（1.3-2.1 m太阳）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，近地行星的探测为行星形成的时间尺度设置了强有力的约束，而近地行星的探测则为行星的形成和迁移设置了约束。因此，如果我们探测到这些恒星的近距离行星，我们就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。我们先前使用CAFÉ光谱仪的观测表明，Mplanet bbb20mjup的行星可以用该仪器检测到。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。于是，我们再次申请用同样的仪器进行观测时间，并在本学期获得了4晚的奖励。一旦调查完成，我们将知道这类恒星的近距离行星的频率是多少，以及它们是否像理论预测的那样，平均质量和密度高于类太阳恒星的行星。

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.