Fig. 1
GTC Osiris CCD frame of XO-2 on 4 December 2009 taken with the tunable filter, with CCD1 (left) and CCD2 (right). XO-2 is the circled bright star located near the center of CCD1, with XO-2’s stellar companion, used for our reference star, nearby and directly overhead. The z-scale of the image was set to best enhance the weak emission sky lines, which can be seen as “rings” around the image. Vignetting from components inside the instrument produced the artifacts at the very left edge of the image.
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