Using a coronagraph combined with liquid crystal spatial light modulator (SLM) wave aberration correction can obtain imaging contrast (10-10) comparable to that using DM, and the imaging area exceeds other international teams, which is expected to greatly improve exoplanets Space imaging detection efficiency.
In the next step, the project team will optimize and upgrade the existing experimental system, effectively compress the volume of the existing system, and place the entire system in a vacuum tank to further improve the imaging contrast by an order of magnitude. This will lay a technical foundation for the next step of carrying space astronomical telescopes to carry out astronomical imaging detection of extraterrestrial / wood-like cold planets and research on atmospheric spectral characteristics. (Jin Nan)
Recently, the Outer Planetary Exploration and High-Resolution Imaging Research Group of the Nanjing Astronomical Optical Technology Institute of the National Astronomical Observatory of the Chinese Academy of Sciences has made breakthrough progress in the field of ultra-high contrast imaging technology in space: Super-contrast imaging technology solution is generated in the area working area. The results were published in the Journal of Astrophysics on November 18.
Finding another planet where life exists is a dream that human beings have always pursued. This requires the detection of planetary systems surrounding the mass of the Earth in the habitable zone of the sun's spectral type of stars, and studying the atmospheric composition of such planets by spectroscopy to determine whether there are vital signs on them, so as to finally answer the question "Is human being alone in the universe" Basic scientific questions.
China Science News (2019-11-24 First Edition Highlights)
The challenge lies in the direct detection of photon signals from terrestrial planets. The photon noise generated by telescope diffraction and speckle noise caused by undesired surface interference wave aberrations such as optical elements need to be resolved in order to reach 10-10 (ten billion times). ) Imaging contrast. International teams mostly use deformable mirrors (DM) to correct the above wave aberrations. However, limited by the number of DM effective units, the dark area of its high-contrast imaging is very small, which will lead to lower detection efficiency of space-like planetary imaging in the future.