Clouds of dust in the atmosphere of extrasolar planets

我们将寻找太阳系外行星在行星凌日期间的大气特征。目标HAT-P-12 b和HAT-P-18 b位于迄今未探测的大气温度范围内，约为1000 K。位于Calar Alto的TWIN仪器覆盖的巨大波长范围将使我们能够区分无云大气、有云甲板的大气、有霾层的大气和有高空吸收器的无云大气。光谱分辨率和灵敏度将允许探测Na和K等原子以及TiO/VO和H2O等分子。这将是第一次对系外行星大气层进行地面观测，覆盖整个光波段。

We will search for signatures of the atmospheres of extrasolar planets during their planetarytransit event. The targets HAT-P-12b and HAT-P-18b lie in a so far unexplored atmospherictemperature range of about 1000K. The huge wavelength range covered by TWIN instrumentat Calar Alto will enable us to distinguish between a cloud-free atmosphere, an atmosphere with cloud deck, an atmosphere with a haze layer and a cloud-free atmosphere with high-altitude absorber.The spectral resolution and sensitivity will allow for the detections of atoms like Na and Kand molecules like TiO/VO and H2O. It will be the first ground-based observation of anexoplanet atmosphere covering the whole optical wavelength interval.