Astronomers have gained a rare glimpse into teh birth of planets wiht new observations of a massive protoplanetary disk surrounding the star GoHam, informally named for its hamburger-like appearance when viewed from Earth. The disk-observed by the atacama Large Millimeter/submillimeter Array (ALMA) in Chile-is unusually large and contains a high concentration of dust, offering a unique laboratory to study the formation of gas giants at vast distances from their stars [[2]]. These findings could help resolve longstanding questions about how planets like Jupiter and Saturn come into being and how they influence the structure of their surrounding systems [[1]].
Astronomers have detected early signs of planet formation within a massive protoplanetary disk surrounding an aging star dubbed Gomez’s Hamburger, or GoHam. This discovery offers a unique opportunity to study how gas giants can develop at extreme distances from their host stars, a process that remains a key question in planetary science.
The observations were made using the Atacama Large Millimeter/submillimeter Array (ALMA), a network of 66 radio antennas located in northern Chile. ALMA revealed solid gas structures within GoHam indicative of the initial stages of planet formation. GoHam is recognized as one of the largest planet-forming disks ever observed.
The system earned its nickname due to its “edge-on” orientation when viewed from Earth, resembling a hamburger with layers of gas rotating around the central young star. This perspective allows astronomers to observe the disk’s vertical and radial structure with unusual clarity – a rare advantage when studying similar systems.
“GoHam gives us a rare and clear view of the vertical and radial structure of a very large disk, seen almost edge-on,” said Charles Law, lead researcher from the University of Virginia, according to a report from Space on January 12, 2026.
Law explained that this makes GoHam a crucial “reference system” for testing detailed models of disk evolution and planet formation. “The combination of the disk’s extreme size, strong asymmetries, winds, and potential for planet formation makes it a perfect laboratory for understanding how giant planets can form far from their stars, and how their existence reshapes the surrounding gas and dust,” he added.
Detailed observations show that the gas and dust within GoHam are arranged in distinct layers. Lighter gases are concentrated in the upper regions of the disk, while heavier gases and denser molecules are found closer to the midplane. This layering aligns with theoretical predictions for planet-forming disks.
GoHam’s disk is also exceptional in its scale. The gas extends to approximately 2,000 times the Earth-Sun distance and reaches heights hundreds of times that distance. Furthermore, the system contains a significantly higher concentration of dust compared to other protoplanetary disks around young stars, increasing the potential for the formation of gas giants and even multi-planet systems.
However, GoHam isn’t perfectly symmetrical. One side of the disk exhibits a brighter and extended dust emission, likely caused by disturbances such as vortices trapping solid material – potential building blocks for planets. On the northern side, researchers also detected traces of photoevaporative winds, where gas is driven outward from the disk by the star’s radiation.
Researchers also identified an arc of carbon monoxide on one side of the disk, associated with a clump of solid material named GoHam b. This clump is believed to be collapsing under its own gravity and may represent the earliest stages of giant planet formation in the outer regions of the GoHam system, orbiting at a considerable distance from the star. This finding could provide valuable insights into the initial conditions required for gas giant formation.
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