Brown dwarves aren’t stars, but they aren’t planets, and a new study suggests there might be more of them than previously thought.
A new study explains how a particular cosmic object called WISEA J153429.75-104303.3 — Nicknamed “The Accident” — came to be. The Accident is a brown dwarf. Now, what’re fascina-
What?
You don’t know what a brown dwarf is?
Oh, I see.
Let’s answer the question, “What is a brown dwarf?”
What is a brown dwarf?
A brown dwarf is a failed star.
Yeah, that’s not a great explanation.
Stars form from huge clouds of gas and dust hundreds of light-years across. They start as a grain of dust (literally), but they grow massive, eventually. When a star forms, it pulls all the material into it, and everything gets squeezed, because of gravity. Once that happens, the centre of the star gets extremely hot, and once it reaches a critical mass, it gets hot enough to spark fusion in the core of the star.
A brown dwarf is a failed star, meaning that it formed like a star, but these objects don’t have enough mass to kick-start nuclear fusion, the process that causes stars to shine. And while brown dwarfs sometimes defy characterization, astronomers have a good grasp of their general characteristics.
Can you see the dark spot moving in the bottom left corner of the screen? It’s a brown dwarf nicknamed “The Accident,” which was discovered by citizen scientist Dan Caselden. It had slipped past typical searches because it doesn’t look like any other known brown dwarfs.
Credits: NASA/JPL-Caltech/Dan Caselden
Or they did… until they found this one.
The Accident got its name after being discovered by luck. It wasn’t observed before 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, 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 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 writes in the 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 different chemistry. If that’s the case, there are likely many more of these ancient brown dwarfs lurking in our galactic neighbourhood.
A Strange Profile
The Accident was spotted by NASA’s Near-Earth Object Wide-Field Infrared Survey Explorer (NEOWISE). 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 Keck Observatory in Hawaii. But the brown dwarf appeared so faint in those wavelengths, they couldn’t detect it at all, confirming 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 telescope. Having determined the object’s distance(50 light-years away), they could determine the speed of the object — about 800, 000 Kilometres 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 ancient, the scientists think that its strange properties aren’t strange at all (!!!) and that they may be a clue to its age.
According to NASA, “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.”
“It’s not a surprise to find a brown dwarf this old, but it is a surprise to find one in our backyard,” said Federico Marocco. Marocco is an astrophysicist at IPAC at Caltech who led the new observations using the Keck and Hubble telescopes. “We expected that brown dwarfs this old exist, but we also expected them to be incredibly rare. The chance of finding one so close to the solar system could be a lucky coincidence, or it tells us that they’re more common than we thought.”
This artist’s illustration shows a dim, cold brown dwarf in space. Brown dwarfs form like stars, but do not have enough mass to ignite nuclear fusion in their cores — the process that causes stars to burn. As a result, they share some physical characteristics with massive planets, like Jupiter.
Credits: IPAC/Caltech
A Lucky Accident
To find more ancient brown dwarfs like The Accident, researchers might have to change how they search for these objects.
The Accident was discovered by citizen scientist Dan Caselden, who was using an online program he built to find brown dwarfs in NEOWISE data. The sky is full of objects that radiate infrared light; by and large, these objects appear to remain fixed in the sky, due to their great distance from Earth. But because brown dwarfs are so faint, they are visible only when they’re relatively close to Earth, and that means scientists can observe them moving across the sky over months or years. (NEOWISE maps the entire sky about once every six months.)
Caselden’s program attempted to remove the stationary infrared objects (like distant stars) from the NEOWISE maps and highlight moving objects that had similar characteristics to known brown dwarfs. He was looking at one such brown dwarf candidate when he spotted another, a much fainter object moving quickly across the screen. This would turn out to be WISEA J153429.75-104303.3, which hadn’t been highlighted because it did not match the program’s profile of a brown dwarf. Caselden caught it by accident.
“This discovery is telling us that there’s more variety in brown dwarf compositions than we’ve seen so far,” said Kirkpatrick. “There are likely more weird ones out there, and we need to think about how to look for them.”
Source: An Accidental Discovery Hints at a Hidden Population of Cosmic Objects
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