Images of SCR 1845-6357 A and B in different filters (NACO-SDI/VLT)

A movie of the SDI camera's images of the low mass star SCR 1845A and its companion, SCR 1845B. Note how the brown dwarf companion (B) is clearly changing in brightness in and out of the SDI methane filters. This proves that B is methane-rich and is thus a rare cool low-mass brown dwarf companion. Moreover, it is also clear that the "halo of speckles" around the much hotter primary star do not change significantly in the three SDI filters. Hence the star's halo can be removed by subtracting the different images, showing that the detection of a faint methane-rich companion (even 10 times closer than B) is made possible with the SDI camera.