What is the fine-grained topic of the following text: A series of observations with the National Science Foundation's Green Bank Telescope (GBT) in West Virginia and the Australia Telescope Compact Array (ATCA) has - for the first time - homed in on three clear sources of AME light, the protoplanetary disks surrounding the young stars known as V892 Tau, HD 97048, and MWC 297. Only return the topic.
Observations of AME light sources in protoplanetary disks around young stars