(Press-News.org) The rare sight of a Wolf-Rayet star – among the most luminous, most massive, and most briefly detectable stars known – was one of the first observations made by NASA’s James Webb Space Telescope in June 2022. Webb shows the star, WR 124, in unprecedented detail with its powerful infrared instruments. The star is 15,000 light-years away in the constellation Sagittarius.
Massive stars race through their lifecycles, and only some of them go through a brief Wolf-Rayet phase before going supernova, making Webb’s detailed observations of this rare phase valuable to astronomers. Wolf-Rayet stars are in the process of casting off their outer layers, resulting in their characteristic halos of gas and dust. The star WR 124 is 30 times the mass of the Sun and has shed 10 Suns’ worth of material – so far. As the ejected gas moves away from the star and cools, cosmic dust forms and glows in the infrared light detectable by Webb.
The origin of cosmic dust that can survive a supernova blast and contribute to the universe’s overall “dust budget” is of great interest to astronomers for multiple reasons. Dust is integral to the workings of the universe: It shelters forming stars, gathers together to help form planets, and serves as a platform for molecules to form and clump together – including the building blocks of life on Earth. Despite the many essential roles that dust plays, there is still more dust in the universe than astronomers’ current dust-formation theories can explain. The universe is operating with a dust budget surplus.
Webb opens up new possibilities for studying details in cosmic dust, which is best observed in infrared wavelengths of light. Webb’s Near-Infrared Camera (NIRCam) balances the brightness of WR 124’s stellar core and the knotty details in the fainter surrounding gas. The telescope’s Mid-Infrared Instrument (MIRI) reveals the clumpy structure of the gas and dust nebula of the ejected material now surrounding the star. Before Webb, dust-loving astronomers simply did not have enough detailed information to explore questions of dust production in environments like WR 124, and whether the dust grains were large and bountiful enough to survive the supernova and become a significant contribution to the overall dust budget. Now those questions can be investigated with real data.
Stars like WR 124 also serve as an analog to help astronomers understand a crucial period in the early history of the universe. Similar dying stars first seeded the young universe with heavy elements forged in their cores – elements that are now common in the current era, including on Earth.
Webb’s detailed image of WR 124 preserves forever a brief, turbulent time of transformation, and promises future discoveries that will reveal the long-shrouded mysteries of cosmic dust.
The James Webb Space Telescope is the world's premier space science observatory. Webb will solve mysteries in our solar system, look beyond to distant worlds around other stars, and probe 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).
END
NASA’s Webb Telescope captures rarely seen prelude to supernova
2023-03-14
[Attachments] See images for this press release:
ELSE PRESS RELEASES FROM THIS DATE:
Potential treatment target for drug-resistant epilepsy identified
2023-03-14
Researchers at Tufts University School of Medicine and colleagues have identified a small molecule that may help treat people with epilepsy whose condition has become resistant to the benzodiazepine drugs usually used in managing seizures. The research, conducted in laboratory cells and rodents, was published online March 7 in Cell Reports Medicine.
Uncontrolled epilepsy can lead to frequent and prolonged seizures lasting five minutes or more that can cause brain cell damage and even death. The condition affects an estimated 3.4 million people in the U.S. and millions more worldwide.
Epilepsy occurs ...
New model provides improved air-quality predictions in fire-prone areas
2023-03-14
UNIVERSITY PARK, Pa. — Globally, wildfires are becoming more frequent and destructive, generating a significant amount of smoke that can be transported thousands of miles, driving the need for more accurate air pollution forecasts. A team of Penn State researchers developed a deep learning model that provides improved predictions of air quality in wildfire-prone areas and can differentiate between wildfires and non-wildfires.
“As climate change continues to cause ecological changes and challenges, it is likely that wildfire ...
New study finds early warning signs prior to 2002 Antarctic ice shelf collapse
2023-03-14
UNIVERSITY PARK, Pa. — In 2002, an area of ice about the size of Rhode Island dramatically broke away from Antarctica as the Larsen B ice shelf collapsed. A new study of the conditions that led to the collapse may reveal warning signs to watch for future Antarctic ice shelf retreat, according to a Penn State-led team of scientists.
“The collapse of the Larsen B ice shelf is generally thought of as an independent event,” said Shujie Wang, assistant professor of geography at Penn State. “Our ...
Oncotarget | MTAP loss in metastatic breast cancer patients: Genomic landscape
2023-03-14
“In breast cancer, MTAP downregulation activates ornithine decarboxylase (ODC) which in turn leads to formation of putrescine which promotes tumor migration, invasion and angiogenesis [15].”
BUFFALO, NY- March 14, 2023 – A new research paper was published in Oncotarget's Volume 14 on March 11, 2023, entitled, “Genomic landscape of metastatic breast cancer (MBC) patients with methylthioadenosine phosphorylase (MTAP) loss.”
Homozygous deletion of methylthioadenosine phosphorylase (MTAP) upregulates de novo synthesis ...
Tim Michalski selected as Jefferson Lab’s engineering manager
2023-03-14
NEWPORT NEWS, VA – The U.S. Department of Energy’s (DOE) Thomas Jefferson National Accelerator Facility has selected Tim Michalski to lead its Engineering Division as the Engineering Division Manager. In this role, Michalski oversees all aspects of the management and operation of the Engineering Division. The division includes more than 200 staff members and supports the Continuous Electron Beam Accelerator Facility and the lab’s growing project portfolio.
“I am proud to name Tim as our newest Engineering Division Manager,” said Jefferson Lab Director Stuart Henderson. “Tim has ...
Princeton Chem, IAS uncover spatial patterns in distribution of galaxies
2023-03-14
In late 2021, Salvatore Torquato, on sabbatical from Princeton’s Department of Chemistry, reached across the aisle as it were and invited a young astrophysicist at the Institute for Advanced Study to apply the tools of statistical mechanics to his own work on the distribution of galaxies.
The astrophysicist, Oliver Philcox, now a postdoc at the Simons Foundation, was intrigued. A year-long collaboration ensued.
The questions at the heart of their unusual partnership were straightforward: can the statistical descriptors Torquato has worked with throughout his career find application in unlikely places like cosmology, and can they accurately characterize the complexity in the distribution ...
Researchers look to AI for decision-making in extreme situations
2023-03-14
Imagine you are a doctor managing the emergency room of a large hospital. You suddenly get a call reporting a mass shooting at a nearby concert. In 20 minutes, you will be responsible for triaging more than 200 patients with a range of injuries. You do not have enough staff or resources and the hospital policies are not designed for a situation this dire.
“When people respond to emergencies, many decisions they face are quite predictable. They’re trained on them, and there’s policy,” said UMass Lowell’s Neil Shortland, associate professor in the School of Criminology and Justice Studies. “But every now and then, they get stuck with a really ...
Mix-and-match kit could enable astronauts to build a menagerie of lunar exploration bots
2023-03-14
When astronauts begin to build a permanent base on the moon, as NASA plans to do in the coming years, they’ll need help. Robots could potentially do the heavy lifting by laying cables, deploying solar panels, erecting communications towers, and building habitats. But if each robot is designed for a specific action or task, a moon base could become overrun by a zoo of machines, each with its own unique parts and protocols.
To avoid a bottleneck of bots, a team of MIT engineers is designing a kit of universal ...
Common dry cleaning chemical linked to Parkinson’s
2023-03-14
A common and widely used chemical may be fueling the rise of the world’s fastest growing brain condition – Parkinson’s disease. For the past 100 years, trichloroethylene (TCE) has been used to decaffeinate coffee, degrease metal, and dry clean clothes. It contaminates the Marine Corps base Camp Lejeune, 15 toxic Superfund sites in Silicon Valley, and up to one-third of groundwater in the U.S. TCE causes cancer, is linked to miscarriages and congenital heart disease, and is associated ...
Molecular component of caffeine may play a role in gut health
2023-03-14
Brigham researchers studying how and why certain cell types proliferate in the gut found that xanthine, which is found in coffee, tea and chocolate, may play a role in Th17 differentiation
Insights may help investigators better understand gut health and the development of conditions such as inflammatory bowel disease
The gut is home to a cast of microbes that influence health and disease. Some types of microorganisms are thought to contribute to the development of inflammatory conditions, such as inflammatory bowel disease (IBD), but the exact cascade of events that leads from microbes to immune cells to disease remains ...