Image and spectrum reconstruction under photon-noise limited condition. (a) Reconstructed 2D image. The white arrows denote positions of planet P1, planet P2, planet P3, respectively. The integration time was set to 55 h. The unit of the color bar is the number of photo-electrons. Reconstructed spectra of three planets (b) P1, (c) P2, and (d) P3 for an integration time of 75 days. The grey line and grey vertical bar of each panel show the input model and the standard deviation of each data point derived through 100 numerical simulations, respectively.