This mosaic shows the entire sky imaged by the Wide-field Infrared Survey Explorer (WISE). Infrared light refers to wavelengths that are longer than those visible to the human eye. Many cosmic objects radiate infrared, including gas and dust clouds where stars form, and brown dwarfs.
Credit: NASA/JPL-Caltech/UCLA
Brown dwarfs aren't quite stars and aren't quite planets, and a new study suggests there might be more of them lurking in our galaxy than scientists previously thought.
A new study offers a tantalizing explanation for how a peculiar cosmic object called WISEA J153429.75-104303.3—nicknamed "The Accident"—came to be. The Accident is a brown dwarf. Though they form like stars, these objects don't have enough mass to kickstart nuclear fusion, the process that causes stars to shine. And while brown dwarfs sometimes defy characterization, astronomers have a good grasp on their general characteristics.
Or they did, until they found this one.
The Accident got its name after being discovered by sheer luck. It slipped past normal searches because it doesn't resemble any of the just over 2,000 brown dwarfs that have been found in our galaxy so far.
As brown dwarfs age, they cool off, and their brightness in different wavelengths of light changes. It's not unlike how some metals, when heated, go from bright white to deep red as they cool. The Accident confused scientists because it was faint in some key wavelengths, suggesting it was very cold (and old), but bright in others, indicating a higher temperature.
"This object defied all our expectations," said Davy Kirkpatrick, an astrophysicist at IPAC at Caltech in Pasadena, California. He and his co-authors posit in their new study, appearing in The Astrophysical Journal Letters, that The Accident might be 10 billion to 13 billion years old—at least double the median age of other known brown dwarfs. That means it would have formed when our galaxy was much younger and had a different chemical makeup. If that's the case, there are likely many more of these ancient brown dwarfs lurking in our galactic neighborhood.
A peculiar profile
Brown dwarfs share certain characteristics with both stars and planets. Generally, they are less massive than stars and more massive than planets. A brown dwarf becomes a star if its core pressure gets high enough to start nuclear fusion, the process that causes stars to shine.
Credit: NASA/JPL-Caltech
The Accident was first spotted by NASA's Near-Earth Object Wide-Field Infrared Survey Explorer (NEOWISE), launched in 2009 under the moniker WISE and managed by NASA's Jet Propulsion Laboratory in Southern California. Because brown dwarfs are relatively cool objects, they radiate mostly infrared light, or wavelengths longer than what the human eye can see.
To figure out how The Accident could have such seemingly contradictory properties—some suggesting it is very cold, others indicating it is much warmer—the scientists needed more information. So they observed it in additional infrared wavelengths with a ground-based telescope at the W. M. Keck Observatory in Hawaii. But the brown dwarf appeared so faint in those wavelengths, they couldn't detect it at all, apparently confirming their suggestion that it was very cold.
They next set out to determine if the dimness resulted from The Accident being farther than expected from Earth. But that wasn't the case, according to precise distance measurements by NASA's Hubble and Spitzer Space Telescopes. Having determined the object's distance—about 50 light-years from Earth—the team realized that it is moving fast—about half a million miles per hour (800,000 kph). That's much faster than all other brown dwarfs known to be at this distance from Earth, which means it has probably been careening around the galaxy for a long time, encountering massive objects that accelerate it with their gravity.
With a mound of evidence suggesting The Accident is extremely old, the researchers propose that its strange properties aren't strange at all and that they may be a clue to its age.
When the Milky Way formed about 13.6 billion years ago, it was composed almost entirely of hydrogen and helium. Other elements, like carbon, formed inside stars; when the most massive stars exploded as supernovae, they scattered the elements throughout the galaxy.
Methane, composed of hydrogen and carbon, is common in most brown dwarfs that have a temperature similar to The Accident. But The Accident's light profile suggests it contains very little methane. Like all molecules, methane absorbs specific wavelengths of light, so a methane-rich brown dwarf would be dim in those wavelengths. The Accident, by contrast, is bright in those wavelengths, which could indicate low levels of methane.
Thus, the light profile of The Accident could match that of a very old brown dwarf that formed when the galaxy was still carbon poor; very little carbon at formation means very little methane in its atmosphere today.
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