Mugnier Laurent M, Cornia Alberto, Sauvage Jean-François, Rousset Gérard, Fusco Thierry, Védrenne Nicolas
ONERA/DOTA (Département d'Optique Théorique et Appliquée), B.P. 72, 92322 Châtillon cedex, France.
J Opt Soc Am A Opt Image Sci Vis. 2009 Jun;26(6):1326-34. doi: 10.1364/josaa.26.001326.
We propose a novel method for the efficient direct detection of exoplanets from the ground using angular differential imaging. The method combines images appropriately, then uses the combined images jointly in a maximum-likelihood framework to estimate the position and intensity of potential planets orbiting the observed star. It takes into account the mixture of photon and detector noises and a positivity constraint on the planet's intensity. A reasonable detection criterion is also proposed based on the computation of the noise propagation from the images to the estimated intensity of the potential planet. The implementation of this method is tested on simulated data that take into account static aberrations before and after the coronagraph, residual turbulence after adaptive optics correction, and noise.
我们提出了一种利用角差分成像从地面高效直接探测系外行星的新方法。该方法对图像进行适当组合，然后在最大似然框架中联合使用组合后的图像，以估计围绕观测恒星运行的潜在行星的位置和强度。它考虑了光子噪声和探测器噪声的混合以及对行星强度的正性约束。还基于从图像到潜在行星估计强度的噪声传播计算提出了合理的检测标准。该方法的实现通过模拟数据进行了测试，这些模拟数据考虑了日冕仪前后的静态像差、自适应光学校正后的残余湍流以及噪声。
