Astronomers in Japan have identified a new phase in early star formation, where young protostars release magnetic energy and form large gas rings. The study, published in The Astrophysical Journal Letters, used observations from the Atacama Large Millimeter/submillimeter Array in Chile to examine a stellar nursery in the Taurus Molecular Cloud. Researchers say the findings help explain how newborn stars shed excess energy and stabilize during their earliest stages.
A newborn star, still hidden inside a dense cocoon of gas and dust, appears to “sneeze” out energy into space. That release, researchers say, may shape how stars like the Sun take form.
A research team from Kyushu University and Kagawa University in Japan reports that young protostars can generate massive, warm rings of gas extending about 1,000 astronomical units from the star. The findings, published in The Astrophysical Journal Letters, point to a process in which magnetic energy is expelled from the protostellar disk during early growth.
The study focuses on a critical stage of stellar evolution, when a protostar gathers mass from a surrounding disk of gas and dust. This disk, known as the protostellar disk, plays a central role in shaping the star and any future planetary system.
ALMA observations reveal hidden structures in stellar nurseries
Directly observing newborn stars has long posed a challenge for astronomers. Protostars form inside stellar nurseries, regions filled with dense gas and dust that block visible light.
To overcome that barrier, the research team relied on the Atacama Large Millimeter/submillimeter Array (ALMA), a network of radio telescopes located in Chile. ALMA allows scientists to detect radio wavelengths that pass through dust clouds, revealing structures otherwise obscured.
Using ALMA, the team studied a protostar within the Taurus Molecular Cloud, a nearby star-forming region. While the Sun is about 4.6 billion years old, the object under observation is far younger, estimated to be under 100,000 years old.
Earlier work by the same group identified smaller, spike-like structures around protostars, roughly 10 astronomical units in size. These features, driven by magnetic activity, were described by researchers as “sneezes” that help expel excess energy.
The new study expands that picture. Data collected from a molecular cloud core known as MC 27 revealed a much larger, ring-shaped structure surrounding the young star.
Magnetic “sneezes” may regulate early star formation
Researchers found that the ring is slightly warmer than the surrounding gas, suggesting it formed through energetic processes linked to magnetic fields.
The team proposes that magnetic fields threading through the protostellar disk can eject both matter and energy outward. These larger-scale “sneezes” generate shock waves that heat the surrounding gas, forming the observed ring structure.
This mechanism could play a stabilizing role. During early formation, protostars accumulate energy rapidly as material falls inward. Without a way to release that energy, the process could become unstable.
By expelling magnetic flux and matter, the protostar may regulate its own growth, allowing it to evolve into a stable main-sequence star. The findings suggest that such activity is not limited to small-scale features but can extend across vast distances in the surrounding environment.
The discovery also raises questions about how common these structures are. The researchers described the ring as unexpectedly clear, noting that they had not anticipated observing such a defined feature.
Next steps focus on broader observations across star-forming regions
The study marks an early step in understanding this phenomenon. Researchers plan to gather higher-resolution observations using ALMA to examine what lies inside these rings and how they evolve over time.
They also intend to analyze archival data from other regions of space to determine whether similar rings appear around different protostars. Expanding the dataset could help establish whether the process is universal or limited to specific environments.
The findings arrive after a decade of observations and analysis by the team. Researchers say continued data collection and debate within the scientific community will be key to refining the model.
For now, the results offer a clearer picture of a chaotic phase in star birth. Gas flows, magnetic fields, and shock waves interact in ways that produce structures both ordered and irregular, shaping the early life of stars.
What begins as a dense cloud of dust and gas may, through bursts of magnetic energy, carve out vast rings in space.
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