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Fig. 6

image

Map of the velocity residual as in Teague et al. (2019) for the disk around TW Hya, but with a flipped color bar to highlight the blueshifted emission (now seen in red). The dotted line serves as a guide for the eye and is determined using the theoretical shape of a spiral launched by a planet (Eq. (17)). The solid line represents the radius of the potential planet’s orbit, which coincides with the blue- and redshifted circular lobes on either side that indicate sub-Keplerian rotation, probably due to a lower opacity inside the gap, so we probe deeper layers in the disk.

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