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We still do not understand how planets form, or why extra-solar planetarysystems are so different from our own solar system. But the last few years havedramatically changed our view of the discs of gas and dust around young stars.Observations with the Atacama Large Millimeter/submillimeter Array (ALMA) andextreme adaptive-optics systems have revealed that most --- if not all ---discs contain substructure, including rings and gaps, spirals, azimuthal dustconcentrations, and shadows cast by misaligned inner discs. These features havebeen interpreted as signatures of newborn protoplanets, but the exact origin isunknown. Here we report the kinematic detection of a few Jupiter-mass planetlocated in a gas and dust gap at 130 au in the disc surrounding the young starHD 97048. An embedded planet can explain both the disturbed Keplerian flow ofthe gas, detected in CO lines, and the gap detected in the dust disc at thesame radius. While gaps appear to be a common feature in protoplanetary discs,we present a direct correspondence between a planet and a dust gap, indicatingthat at least some gaps are the result of planet-disc interactions.

Kinematic detection of a planet carving a gap in a protoplanetary disc