Using the Atacama Large Millimeter/submillimeter Array (ALMA), astronomers have detected the emission from 13CO — measure of the molecular gas distribution — in a circumplanetary disk embedded in the protoplanetary disk of the T Tauri star AS 209. Artist’s impression of an infant star still surrounded by a protoplanetary disk in which planets are forming. Image credit: L. Calçada / ESO. “As a giant planet forms, it opens a gap in...
