Extended Data Fig. 1: SN 2022jli and the host galaxy NGC 157.
From: A 12.4-day periodicity in a close binary system after a supernova
The background image shows the three-color (Y, H, K bands) image of NGC 157 taken before the supernova explosion with the HAWK-I instrument on ESO’s Very Large Telescope (VLT) at the Paranal Observatory in Chile (Credit: ESO). The red plus symbol in the figure indicates the position of SN 2022jli. Inset panels: a, zoom-in view around SN 2022jli showing the nearby environment in NIR; b, zoom-in view around SN 2022jli on an r-band image taken with Magellan/IMACS on 2022 December 15; c, Na I absorption lines from the host galaxy; d, the narrow diffuse interstellar band absorption (DIB6283) from the host galaxy. a,b, Share the same field of view size. c,d, The red spectrum shows the averaged spectrum of three X-Shooter spectra and one IMACS spectrum, whereas the individual spectra are shown in grey in the background.
