Tiny Dust Grains From Massive Stars: How the Smallest and Largest Are Linked
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Star dust is at the root of everything that exists, and is produced in large quantities around Wolf-Rayet binaries. But there are some puzzling observations of dust grain sizes that require explanations. New research shows why different observations have found different dust grain sizes.
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Tiny Dust Grains From Massive Stars: How the Smallest and Largest Are Linked By Evan Gough - March 02, 2026 06:45 PM UTC | Stars Aging stars are prolific producers of dust, and the dust plays an important role in the cosmos. Their dust is ejected into the interstellar medium where it is taken up in the next generation of stars and planets. This is how stars seed their environments with metals, elements heavier than hydrogen and helium, which are necessary for rocky planets and life to form. Astronomers study this stellar dust to learn more about how it's produced and spread into the cosmos. Wolf-Rayet binaries are natural laboratories for this work. WR stars are extremely massive and hot stars whose winds have blown away their outer hydrogen envelopes. Studying dust in binary pairs involving a WR star is important because of the vast amounts of dust that these stars generate. In a binary system, this becomes even more advantageous. The wind from a lone WR star can be too hot and too diffuse to condense into dust. But in a binary situation, especially where the second star is an O-type star, the two powerful stellar winds collide. This forms a shock zone of dense dust that's thicker than either single wind. In this configuration, the gas can rapidly cool and form massive amounts of dust. That's why WR binaries are natural laboratories for studying dust. When observing these binary star systems, astronomers have measured the size of the dust grains and found conflicting results. Some of these binary systems produce larger grains, while others produce only very tiny grains. This is important because grain size can affect how the grains interact with light, what type of chemistry can occur on their surfaces, and how planets form. In new research, a team of scientists used the ALMA and the JWST together to try to understand these conflicting results. Their work is titled " Constraining Properties of Dust Formed in Wolf–Rayet Binary WR 112 Using Mid-infrared and Millimete...
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