Poster Open Access

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

Bardalez Gagliuffi, Daniella; Faherty, Jacqueline; Schneider, Adam; Meisner, Aaron; Caselden, Dan; Colin, Guillaume; Goodman, Sam; Kirkpatrick, Davy; Kuchner, Marc; Gagne, Jonathan; Logsdon, Sarah; Burgasser, Adam; Allers, Katelyn; Debes, John; Wisniewski, John; Rothermich, Austin; Andersen, Nikolaj; Thevenot, Melina; Walla, Jim

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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  • Bardalez Gagliuffi et al. (2020). WISEA J083011.95+283716.0: A Missing Link Planetary-mass Object.

  • Cushing et al. (2011). The Discovery of Y Dwarfs using Data from the Wide-field Infrared Survey Explorer (WISE).

  • Meisner et al. (2020a). Expanding the Y Dwarf Census with Spitzer Follow-up of the Coldest CatWISE Solar Neighborhood Discoveries.

  • Luhman (2014). Discovery of a ~250 K Brown Dwarf at 2 pc from the Sun.

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