Scientists have discovered the oldest known planet-forming disk — a 45 million-year-old ring of gas and dust that

orbits around a young star, from which planets can form as the material collides and aggregates. Led by Steven Silverberg of University of Oklahoma, the team described a newly identified red dwarf star with a warm circumstellar disk, of the kind associated with young planetary systems.

 
This one is rare
  1. Circumstellar disks around red dwarfs like this one are rare to begin with, but this star, called AWI0005x3s, appears to have sustained its disk for an exceptionally long time.
  2. “Most disks of this kind fade away in less than 30 million years.
  3. This particular red dwarf is a candidate member of the Carina stellar association, which would make it around 45 million years old. It’s the oldest red dwarf system with a disk we’ve seen in one of these associations.
  4. The discovery relied on citizen scientists from Disk Detective, a project designed to find new circumstellar disks.
  5. At the project’s website, users make classifications by viewing ten-second videos of data from NASA surveys, including the Wide-field Infrared Survey Explorer (WISE) mission and Two-Micron All Sky Survey (2MASS) projects.
  6. The WISE mission alone found 747 million [warm infrared] objects, of which we expect a few thousand to be circumstellar disks,” Mr. Kuchner said.
  7. The star and its disk may possibly host extrasolar planets, researchers said. Most of the extrasolar planets that have been found by telescopes have been located in disks similar to the one around this unusual red dwarf.
  8. Moreover, this particular star is the same spectral type as Proxima Centauri, the Sun’s nearest neighbour, which was shown to host at least one exoplanet — Proxima b.