Original title: Planetary gas gaps and kinematic signatures in the planet forming disk around WISPIT 2
Nienke van der Marel, Jochen Stadler, Andres F. Izquierdo, Ruobing Dong +7 · September 2026
Astronomers struggle to watch giant planets form. These worlds grow inside disks of gas and dust around young stars, but spotting them directly is hard. Looking for hints like cleared gaps or weird gas flows is often confusing when scientists cannot see the actual planets carving them out. To tackle this, researchers used the Atacama Large Millimeter Array, a powerful network of radio telescopes, to study a young disk named WISPIT 2. They found gas gaps and motion patterns right where giant baby planets were already known to exist. These gas openings match gaps previously seen in scattered light, and their shapes look eccentric, or stretched out, just as models predict for heavy planets. Finally, a missing stretch in the outer disk suggests a third planet might be hiding there.
Imagine you are looking at a snow-covered field and see a set of tracks. The tracks are uneven and show where something heavy has passed through. You cannot see the animal that made them, but the pattern tells you it was large and how it moved. Here, the disk of gas around a young star is like the snow, and the gaps and kinematic signatures are like the tracks. By seeing exactly where the tracks are, astronomers confirm that giant planets are the ones making them.
This confirms that the gaps and wiggles astronomers see in planet-forming disks are direct signatures of giant planets. It links decades of theory to actual observations, helping us understand how planetary systems like our own take shape.
The findings are based on a single disk, WISPIT 2. The inference of a third planet is speculative. The connection between substructures and planets still relies on previously detected protoplanets; the method does not directly detect new planets.
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Planetary gas gaps and kinematic signatures in the planet forming disk around WISPIT 2 — Nienke van der Marel, Jochen Stadler, Andres F. Izquierdo et al.
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.