Planet Formation
Three tracers reveal a planet still being built
Hubble, VLT, and ALMA data converge on EK Cha b, a candidate young giant whose carbon-monoxide footprint fits a circumplanetary disk.
Briefed October 9, 2026 · Aliens in the Clouds
Accepted Study · Protoplanet Candidate
Felipe Alarcón and colleagues reanalyzed archival observations of the young M star EK Cha from Hubble, VLT/NACO, VLT/MUSE, and ALMA. At the candidate companion's position they recover emission in 0.82-micron light, millimeter continuum, and spectrally resolved carbon monoxide rather than relying on a single imaging band.
The carbon-monoxide signal is kinematically consistent with gas orbiting in a circumplanetary disk, while evolutionary-model fits place the source in the planetary-mass regime. That multi-tracer agreement makes EK Cha b a compelling new laboratory for planet formation around a low-mass star, but the accepted paper deliberately retains the word ‘candidate’ and calls for deeper observations to confirm its nature.
Why it matters
Only a handful of forming planets in Class II disks are widely accepted. A confirmed example around an M dwarf would open a poorly sampled regime where planets are common but direct protoplanet detections remain rare.
What the source establishes
Accepted in Astronomy & Astrophysics Letters and submitted to arXiv October 7. The optical, millimeter, and carbon-monoxide signals are reported detections; planetary mass comes from evolutionary models, and the object is not yet fully confirmed.
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