1 research outputs found
WISEA J083011.95+283716.0: A Missing Link Planetary-Mass Object
We present the discovery of WISEA J083011.95+283716.0, the first Y dwarf
candidate identified through the Backyard Worlds: Planet 9 citizen science
project. We identified this object as a red, fast-moving source with a faint
detection in multi-epoch \textit{AllWISE} and unWISE images. We have
characterized this object with Spitzer Space Telescope and \textit{Hubble Space
Telescope} follow-up imaging. With mid-infrared detections in
\textit{Spitzer}'s \emph{ch1} and \emph{ch2} bands and flux upper limits in
Hubble Space Telescope and filters, we find that this object is
both very faint and has extremely red colors ( mag,
mag), consistent with a T K source, as
estimated from the known Y dwarf population. A preliminary parallax provides a
distance of pc, leading to a slightly warmer temperature
of K. The extreme faintness and red Hubble Space Telescope and
Spitzer Space Telescope colors of this object suggest it may be a link between
the broader Y dwarf population and the coldest known brown dwarf WISE
J08550714, and highlight our limited knowledge of the true spread of Y dwarf
colors. We also present four additional Backyard Worlds: Planet 9 late-T brown
dwarf discoveries within 30 pc.Comment: 13 pages, 6 figures, 5 table