Published February 26, 2021 | Version v1
Poster Open

W0830: an extremely cold, missing-link planetary-mass object at the low-mass end of the IMF

  • 1. American Museum of Natural History
  • 2. United States Naval Observatory
  • 3. NSF's National Optical-Infrared Astronomy Research Laboratory
  • 4. Gigamon Applied Threat Research
  • 5. Backyard Worlds: Planet 9
  • 6. California Institute of Technology/Infrared Processing and Analysis Center
  • 7. NASA Goddard Space Flight Center,
  • 8. Universite de Montreal
  • 9. University of California, San Diego
  • 10. Bucknell University
  • 11. Space Telescope Science Institute
  • 12. University of Oklahoma
  • 13. University Of Central Florida
  • 14. Kolding Hospital


Here we present an extremely cold, planetary-mass brown dwarf which bridges the temperature gap between the warmer Y dwarf population and the coldest brown dwarf ever discovered. W0830 was identified through the Backyard Worlds: Planet 9 citizen science collaboration, which brings together over 150,000 people around the world in identifying cold, fast-moving sources through coadded WISE images. We have characterized this object with Hubble and Spitzer Space Telescope follow-up photometry. The available evidence points to a ~Y1 source at Teff ~ 350 K with a planetary mass of 4-13Mjup, as extrapolated from the known Y dwarf population. This object joins a small, yet growing sample of “missing link” objects connecting brown dwarfs to giant planets in terms of temperature.



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