At the heart of the Milky Way, Sagittarius A * controls a violent area of extreme radiation, effective winds and gravitational tension.

Astronomers have long questioned how vulnerable particles and dust grains– the raw product for worlds and, ultimately, life– might perhaps endure so near to such an environment.

“Galactic centers are amongst the most severe environments, so comprehending whether stars can continue enhancing their environments there is an essential concern,” stated Dr. Florian Peißker, an astronomer at the University of Cologne.

“With Webb, we can straight observe how stars act under these conditions and see that dust production stays incredibly resistant.”

INTERNAL REVENUE SERVICE 3 is a red giant around 72 million years of ages and has to do with 6 times the mass of the Sun.

The star is nearing completion of its life, puffing off layers of gas and dust in a stage astronomers call the asymptotic huge branch.

Utilizing Webb’s MIRI (Mid-Infrared Instrument), Dr. Peißker and his associates produced the most total infrared spectrum of the star ever taped, which settles an enduring concern about the star’s chemistry.

Earlier ground-based observations had actually exposed the possibility that IRS 3 was carbon-rich, however the brand-new Webb information reveal 2 obvious absorption functions that are produced just by oxygen-rich, silicate-based dust.

This mix eliminate a carbon-dominated structure and strongly categorizes IRS 3 as an oxygen-rich giant.

Maybe more striking, the astronomers found clear signatures of water particles in the product surrounding the star.

Water and other intricate particles are infamously vulnerable, quickly damaged apart by ultraviolet and X-ray radiation of the kind that puts out of the area around a great void.

Discovering undamaged water so near to the Galactic center recommends that the star’s dirty envelope is thick enough to protect fragile chemistry from its severe environments.

“This discovery was possible since of Webb’s extremely capable infrared instruments,” stated Dr. Macarena Garcia Marin, an astronomer at ESA.

“This is the very first time a constant mid-infrared spectrum has actually been gathered for this star, permitting us to discover the functions from the silicate dust and discover the star’s real chemical identity.”

To analyze the spectrum, the scientists developed computer system designs of the star’s surrounding shell of gas and dust utilizing a radiation-transport code called Hyperion, screening approximately 100,000 variations before deciding on a finest fit.

The designs indicate a star with a luminosity about 60,000 times that of the Sun and an envelope arranged into numerous concentric shells, each with various temperature levels, densities and dust structures– hot aluminum oxide near to the star paving the way to cooler silicate grains further out, with a temperature level drop of approximately 1,000 K throughout the structure.

“The detection of water is particularly amazing due to the fact that it reveals that molecular product can make it through in an environment controlled by extreme radiation,” Dr. Macarena.

“This informs us that even near to a supermassive great void, stars can continue contributing product back into their environments.”

The outcomes appear in the journal Astronomy & & Astrophysics

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F. Peißker et al2026. Dust production in the severe environment of Sgr A *. MIRI/JWST observation of the O-rich asymptotic huge branch star IRS 3. A&A 712, A79; doi: 10.1051/ 0004-6361/2026 60243