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NASA’s Webb Reveals Long-Studied Star Is Actually Twins

June 13, 2024
in Science
NASA’s Webb Reveals Long-Studied Star Is Actually Twins
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Managed by NASA’s Jet Propulsion Laboratory through launch, Webb’s Mid-Infrared Instrument also revealed jets of gas flowing into space from the twin stars.

Scientists recently got a big surprise from NASA’s James Webb Space Telescope when they turned the observatory toward a group of young stars called WL 20. The region has been studied since the 1970s with at least five telescopes, but it took Webb’s unprecedented resolution and specialized instruments to reveal that what researchers long thought was one of the stars, WL 20S, is actually a pair that formed about 2 million to 4 million years ago.

The discovery was made using Webb’s Mid-Infrared Instrument (MIRI) and was presented at the 244th meeting of the American Astronomical Society on June 12. MIRI also found that the twins have matching jets of gas streaming into space from their north and south poles.

“Our jaws dropped,” said astronomer Mary Barsony, lead author of a new paper describing the results. “After studying this source for decades, we thought we knew it pretty well. But without MIRI we would not have known this was two stars or that these jets existed. That’s really astonishing. It’s like having brand new eyes.”

The team got another surprise when additional observations by the Atacama Large Millimeter/submillimeter Array (ALMA), a group of more than 60 radio antennas in Chile, revealed that disks of dust and gas encircle both stars. Based on the stars’ age, it’s possible that planets are forming in those disks.

The combined results indicate that the twin stars are nearing the end of this early period of their lives, which means scientists will have the opportunity to learn more about how the stars transition from youth into adulthood.

“The power of these two telescopes together is really incredible,” said Mike Ressler, project scientist for MIRI at NASA’s Jet Propulsion Laboratory and co-author of the new study. “If we hadn’t seen that these were two stars, the ALMA results might have just looked like a single disk with a gap in the middle. Instead, we have new data about two stars that are clearly at a critical point in their lives, when the processes that formed them are petering out.”

WL 20 resides in a much larger, well-studied star-forming region of the Milky Way galaxy called Rho Ophiuchi, a massive cloud of gas and dust about 400 light-years from Earth. In fact, WL 20 is hidden behind thick clouds of gas and dust that block most of the visible light (wavelengths that the human eye can detect) from the stars there. Webb detects slightly longer wavelengths, called infrared, that can pass through those layers. MIRI detects the longest infrared wavelengths of any instrument on Webb and is thus well equipped for peering into obscured star-forming regions like WL 20.

Radio waves can often penetrate dust as well, though they may not reveal the same features as infrared light. The disks of gas and dust surrounding the two stars in WL 20S emit light in a range that astronomers call submillimeter; these, too, penetrate the surrounding gas clouds and were observed by ALMA.

But scientists could easily have interpreted those observations as evidence of a single disk with a gap in it had MIRI not also observed the two stellar jets. The jets of gas are composed of ions, or individual atoms with some electrons stripped away that radiate in mid-infrared wavelengths but not at submillimeter wavelengths. Only an infrared instrument with spatial and spectral resolution like MIRI’s could see them.

ALMA can also observe clouds of leftover formation material around young stars. Composed of whole molecules, like carbon monoxide, these clouds of gas and dust radiate light at these longer wavelengths. The absence of those clouds in the ALMA observations shows that the stars are beyond their initial formation phase.

“It’s amazing that this region still has so much to teach us about the life cycle of stars,” said Ressler. “I’m thrilled to see what else Webb will reveal.”

The James Webb Space Telescope is the world’s premier space science observatory. Webb is solving mysteries in our solar system, looking beyond to distant worlds around other stars, and probing the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and CSA (Canadian Space Agency).

MIRI was developed through a 50-50 partnership between NASA and ESA. A division of Caltech in Pasadena, California, JPL led the U.S. efforts for MIRI, and a multinational consortium of European astronomical institutes contributes for ESA. George Rieke with the University of Arizona is the MIRI science team lead. Gillian Wright is the MIRI European principal investigator.

The MIRI cryocooler development was led and managed by JPL, in collaboration with Northrop Grumman in Redondo Beach, California, and NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

Calla Cofield
Jet Propulsion Laboratory, Pasadena, Calif.
626-808-2469
[email protected]

2024-085

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : Nasa – https://www.nasa.gov/missions/webb/nasas-webb-reveals-long-studied-star-is-actually-twins/

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