April 26, 2012

NASA’s WISE catches aging star erupting with dust

Images from NASA’s Wide-field Infrared Survey Explorer reveal an old star in the throes of a fiery outburst and spraying the cosmos with dust.

The findings offer a rare, real-time look at the process by which stars like our sun seed the universe with building blocks for other stars, planets and even life.

The star, catalogued as WISE J180956.27-330500.2, was discovered in images taken during the WISE survey in 2010, the most detailed infrared survey to date of the entire celestial sky. It stood out from other objects because it glowed brightly with infrared light. When compared to images taken more than 20 years ago, astronomers found the star was 100 times brighter.

“We were not searching specifically for this phenomenon, but because WISE scanned the whole sky, we can find such unique objects,” said Poshak Gandhi of the Japan Aerospace Exploration Agency, lead author of a new paper to be published in the Astrophysical Journal Letters.

Results indicate the star recently exploded with copious amounts of fresh dust, equivalent in mass to our planet Earth. The star is heating the dust and causing it to glow with infrared light.

“Observing this period of explosive change while it is actually ongoing is very rare,” said co-author Issei Yamamura of JAXA. “These dust eruptions probably occur only once every 10,000 years in the lives of old stars, and they are thought to last less than a few hundred years each time. It’s the blink of an eye in cosmological terms.”

The aging star is in the “red giant” phase of its life. Our own sun will expand into a red giant in about 5 billion years. When a star begins to run out of fuel, it cools and expands. As the star puffs up, it sheds layers of gas that cool and congeal into tiny dust particles. This is one of the main ways dust is recycled in our universe, making its way from older stars to newborn solar systems. The other way, in which the heaviest of elements are made, is through the deathly explosions, or supernovae, of the most massive stars.

“It’s an intriguing glimpse into the cosmic recycling program,” said Bill Danchi, WISE program scientist at NASA Headquarters in Washington. “Evolved stars, which this one appears to be, contribute about 50 percent of the particles that make up humans.”

Astronomers know of one other star currently pumping out massive amounts of dust. Called Sakurai’s Object, this star is farther along in the aging process than the one discovered recently by WISE.

After Poshak and his team discovered the unusual, dusty star with WISE, they went back to look for it in previous infrared all-sky surveys. The object was not seen at all by the Infrared Astronomical Satellite, which flew in 1983, but shows up brightly in images taken as part of the Two Micron All-Sky Survey in 1998.

Poshak and his colleagues calculated the star appears to have brightened dramatically since 1983. The WISE data show the dust has continued to evolve over time, with the star now hidden behind a very thick veil. The team plans to follow up with space and ground-based telescopes to confirm its nature and to better understand how older stars recycle dust back into the cosmos.

NASA’s Jet Propulsion Laboratory, Pasadena, Calif., manages and operates WISE for NASA’s Science Mission Directorate in Washington. The spacecraft was put into hibernation mode after it scanned the entire sky twice, completing its main objectives. The principal investigator for WISE, Edward Wright, is at the University of California, Los Angeles. The mission was selected competitively under NASA’s Explorers Program managed by the agency’s Goddard Space Flight Center in Greenbelt, Md. The science instrument was built by the Space Dynamics Laboratory in Logan, Utah. The spacecraft was built by Ball Aerospace & Technologies Corp. in Boulder, Colo. Science operations and data processing take place at the Infrared Processing and Analysis Center at the California Institute of Technology (Caltech) in Pasadena. Caltech manages JPL for NASA.

The IRAS mission was a collaborative effort between NASA, the Netherlands and the United Kingdom. The 2MASS mission was a joint effort between Caltech, the University of Massachusetts and NASA. Data are archived at the Infrared Processing and Analysis Center at Caltech.


All of this week's top headlines to your email every Friday.



Defense cuts could hit civilian workforce

Tens of thousands of civilian employees in the Defense Department could receive warnings about potential layoffs four days before the November election if impending spending cuts aren’t averted, hitting presidential battleground states such as Virginia and Florida hard. The alerts would come in addition to any that major defense contractors might send out at the...
Air Force photograph by SSgt. William P. Coleman

Training exercises enhance international relations

Air Force photograph by SSgt. William P. Coleman Colombian air force Kfir aircraft prepare for a mission during Red Flag 12-4 July 18, 2012, at Nellis Air Force Base, Nev. A U.S. Air Force pilot rides in the backseat of a Kfir ...

Airbus owner EADS ups targets, delays A350

Airbus parent company EADS NV July 27 announced a further delay to its new A350 aircraft as it reported second-quarter earnings that almost quadrupled from a year ago. Net profit at the Leiden, Netherlands-based European Aeronautic Defence & Space Company was $567 million, up from $148 million in the same period a year ago. Sales...

Courtesy photograph

Boeing receives 10th WGS satellite order from U.S. Air Force

Courtesy photograph The Wideband Global SATCOM satellite is the successor to the Defense Satellite Communications System-III. One WGS satellite has about 12 times the bandwidth of a DSCS-III satellite. EL SEGUNDO, Calif. –...

Lockheed Martin’s Gyrolinkâ„¢ selected for U.S. Army’s R-VOSS program

Lockheed Martin has been awarded a $21.4 million contract from the U.S. Army for its commercial GyroLinkâ„¢ system for the Remote – Vehicle Optics Sensor System program. GyroLink provides a real-time full motion video network that transmits video across military vehicles at significant distances. This allows members of a route-clearance patrol to use monitors inside...

News Briefs – July 30, 2012

Mechanical failure blamed in Arizona Harrier crash Military officials say early findings point to mechanical failure in the crash of a U.S. Marine Corps Harrier attack jet on a training mission in southwestern Arizona. The AV-8B Harrier went down July 25 afternoon about 15 miles northwest of the Marine Corps Air Station Yuma near the...


Be the first to comment!

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>