Closest brown dwarf
One of the most interesting finds so far was announced at the American Astronomical Society meeting in June, where the Disk Detectives team revealed that volunteers had spotted a new brown dwarf just 100 parsecs from our Sun.
Brown dwarfs are too small to be stars and too large to be planets, and because they don’t shine, they’re very hard to see. However, scientists think they’re extremely common, so new finds are exciting. After volunteers flagged the object in Disk Detective, astronomers conducted follow up observations using the massive 6.5-meter Magellan telescopes at Las Campanas Observatory in Chile. They discovered that the object is in an extremely close-by group of stars, making it the closest young brown dwarf known.
And now astronomers aim to take advantage of that close proximity to get even better pictures of the object using still bigger observatories, like the Atacama Large Millimeter Array (ALMA), which combines 66 large radio dishes into a single telescope. ALMA could reveal intimate details of the brown dwarf’s disk, helping astronomers understand these ordinarily hard-to-see objects. Already they can see that it appears to have the kind of disk that can form planets.
“When it’s this close, we consider it to be within the solar neighborhood,” study author Maria Schutte, a grad student at the University of Oklahoma, said in a media release. “That proximity is really important, because brown dwarfs are lower in mass and inherently less bright than other objects like stars. So the closer these objects are to us, the more detail we’ll be able to see.”
One of the lingering mysteries about brown dwarfs is whether they form more like planets or more like stars, the team says. And this latest find's combination of youth and proximity could help provide an answer.
Peter Pan disks
Among their finds, in 2016, volunteers also uncovered a totally new kind of young planetary system. They call them Peter Pan disks “because they apparently refuse to grow up,” the scientists say.
Astronomers suspect that protoplanetary disks only last for a few million years, and so the biggest planets, like Jupiter and Saturn, must form very fast. But as volunteers poured over the images from Disk Detectives, they started finding these Peter Pan disks that appeared as much as 10 times older than that. It wasn't just a fluke find, either. The discovery of four new Peter Pan disks was published in The Astrophysical Journal back in February.
And in a follow up study published this summer, astronomers looked at "Neverland's parameters," revealing that the disks form far from other stars in lonely systems. They also begin life much bigger than the average planetary disk, according to research published in the journal Monthly Notices of the Royal Astronomical Society: Letters.
NASA recently released Disk Detective 2.0 with 150,000 new images, so astronomers are eager to see what fresh finds volunteers will discover this time.
“We have multiple citizen scientists look at each object, give their own independent opinion, and trust the wisdom of the crowd to decide what things are probably galaxies and what things are probably stars with disks around them,” MIT researcher Steven Silverberg, who directs Disk Detective, said in a media release.
Note: Citizen Science Salon is a partnership between Discover, Astronomy's sister publication, and SciStarter.org.
This project is a SciStarter Affiliate. Use your SciStarter account email to join Disk Detective and earn credit for your participation in your SciStarter dashboard. To sign up for Disk Detectives, visit SciStarter.org/Disk-Detective.