Ex-student paper day! Sutlieff et al. (2024) using a gvAPP coronagraph to suppress diffraction from the primary star so that the variability of a faint substellar companion can be measured to 3% precision and a 3.2 hour periodic variability detected one night but disappears the next! 🔭🪐 #astrodon

A noisy image showing a primary star as a yellow circle with the brown dwarf companion to the lower right of the star as a smaller yellow circle.Many light curves showing the change in brightness of the BD companion as a function of wavelength. Some wavelengths don't change at all over the 32 hours of monitoring, whilst other wavelengths show very large variations from hour to hour.

Matthew Kenworthy @kenworthy