OK, it puzzled astronomers. We get it. Naming it 'The Accident' still seems a little excessive. (From 2021)
with masses between 77 and 98 times that of Jupiter. “They’re right on the border where hydrogen fusion starts to take place,” said Grieves. It’s unclear at the moment, however, which side of the boundary these five objects actually sit on. “We don’t know the true nature of these objects,” said Grieves, “because they’re so close to this limit.”. “We know of some brown dwarf systems that look like they have protoplanetary disks around them,” said Kirkpatrick.
On the opposite end of the brown dwarf mass scale lies the Accident. It’s an extremely small, cold, and faint object—“just barely at the level where we could detect it,” said Kirkpatrick. Astronomers are eager to work out what the difference is between a low-mass brown dwarf and a high-mass gas giant planet. This makes small and faint brown dwarfs like the Accident useful targets.
The Accident also appears to be made of some strange stuff. As the universe ages, supernovas spit out lots of heavier elements such as carbon and oxygen—what astronomers call “metals.” Because of this, old objects that formed early in the universe’s history tend to have few metals, while new objects have more. Yet despite being found in our local solar neighborhood—home mostly to young, metal-rich stars—the Accident appears to be metal-poor.
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