A novel simultaneous differential imager for the direct imaging of giant planets
A novel simultaneous differential imager for the direct imaging of giant planets
复制标题
一种用于巨行星直接成像的新型同步差分成像仪
DOI：
10.1117/12.549406
复制
发表时间：
2004
影响因子：
3.3
通讯作者：
M. Hartung
中科院分区：
文献类型：
--
作者：
R. Lenzen;L. Close;W. Brandner;B. Biller;M. Hartung
VLT的自适应光学系统纳科配备了同步差分成像仪（SDI），旨在提供巨大的太阳系外行星的直接成像。利用太阳外冷（Teff < 1200K）巨行星在H波段近红外大气窗口1.62 μm以上都有较强的CH4（甲烷）吸收的事实，用纳科同时获得了以该吸收边为中心的衍射极限窄带图像，以降低散斑噪声本底，提高对附近年轻恒星周围类彗星行星的灵敏度。我们提出了该设备的技术实现，并在调试运行过程中获得的第一个结果。
The Adaptive Optics System NACO at the VLT has been equipped with a Simultaneous Differential Imager (SDI) designed to provide direct imaging of giant extra-solar planets. Exploiting the fact that all cool (Teff < 1200K) extra-solar giant planets have strong CH4 (methane) absorption beyond 1.62 μm in the H band NIR atmospheric window, diffraction limited narrow-band images centred on this absorption edge are obtained with NACO simultaneously to reduce the speckle-noise floor and increase the sensitivity for Jupiter-like planets around nearby young stars. We present the technical realization of this device and first results obtained during the commissioning run.