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Exoplanet detections have revolutionized astronomy, offering new insightsinto solar system architecture and planet demographics. While nearly 1900exoplanets have now been discovered and confirmed, none are still in theprocess of formation. Transition discs, protoplanetary disks with innerclearings best explained by the influence of accreting planets, are naturallaboratories for the study of planet formation. Some transition discs showevidence for the presence of young planets in the form of disc asymmetries orinfrared sources detected within their clearings, as in the case of LkCa 15.Attempts to observe directly signatures of accretion onto protoplanets havehitherto proven unsuccessful. Here we report adaptive optics observations ofLkCa 15 that probe within the disc clearing. With accurate source positionsover multiple epochs spanning 2009 - 2015, we infer the presence of multiplecompanions on Keplerian orbits. We directly detect H{\alpha} emission from theinnermost companion, LkCa 15 b, evincing hot (~10,000 K) gas falling deep intothe potential well of an accreting protoplanet.

Accreting Protoplanets in the LkCa 15 Transition Disk