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Companions at sub-arcsecond separation from young stars are difficult toimage. However their presence can be inferred from the perturbations theycreate in the dust and gas of protoplanetary disks. Here we present a newinterpretation of SPHERE polarised observations that reveal the previouslydetected inner spiral in the disk of HD 100546. The spiral coincides with anewly detected 12CO inner spiral and the previously reported CO emissionDoppler-flip, which has been interpreted as the signature of an embeddedprotoplanet. Comparisons with hydrodynamical models indicate that thisDoppler-flip is instead the kinematic counterpart of the spiral, which islikely generated by an inner companion inside the disk cavity.

The Origin of the Doppler-flip in HD 100546: a large scale spiral arm generated by an inner binary companion