Shulou(Shulou.com)12/24 Report--

On December 19, CTOnews.com, the Zijinshan Observatory of the Chinese Academy of Sciences recently updated its scientific research and successfully captured and studied the very early shock wave radiation signals of supernova SN2023ixf in conjunction with Tsinghua University.

By extracting and analyzing polychromatic photometric data about an hour after the supernova explosion, the research team witnessed for the first time the strange phenomenon of very early shock wave radiation changing from red to blue.

The supernova SN 2023ixf is 2200 light-years from Earth. Although it is not the most unique star in the vast universe, it is one of the closest supernovae to us in the past 10 years, so its explosion is of great significance to scientists on Earth.

Combined with physical processes such as shock wave breakthrough, circumstellar dust ablation and peristellar matter interaction, the team explained the multi-band light variation curve during the rise of SN2023ixf, which is published in Nature.

SN2023ixf erupted in the nearest neighbor galaxy M101, about 6.8Mpc, and was first discovered by Japanese amateur astronomer Koichi Itagaki on May 19, 2023. Neighboring galaxies such as M101 are long-term favorite targets for astronomical enthusiasts at home and abroad.

After SN2023ixf was discovered, a joint research team led by Wang Xiaofeng, a professor at Tsinghua University and a visiting researcher at Zijinshan Observatory, quickly contacted astronomy enthusiasts and obtained color images covering before and after the outbreak.

Fig. 1 very early optical photometric data of SN2023ixf. Bmerd: single-band photometric data extracted from RGB color images. IMuro: composite color photometric data from 1.4 to 5.7 hours after the supernova explosion show the rapid evolution of SN2023ixf from red to blue.

Fig. 2 fitting of multi-band light curve in the very early stage of SN2023ixf. By combining the physical processes such as shock wave breakthrough, extinction caused by rapid dust ablation and the interaction of peristellar matter, the multi-band light variation curve during the rising period of SN2023ixf can be explained reasonably.

Fig. 3 Antarctic Survey Telescope AST3-3 (above) and Yao an High Precision Telescope (YAHPT, bottom). CTOnews.com attached the reference address of the paper: Li, G., Hu, M., Li, W. et al. A shock flash breaking out of a dusty red supergiant. Nature (2023). Https://doi.org/10.1038/s41586-023-06843-6

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