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1/18/18: SO/NOAO Joint Colloquium Series: Aaron Meisner, LBNL


Title: Mapping the Universe in Search of Nearby Worlds

The Wide-field Infrared Survey Explorer (WISE) has already provided a spectacular new view of the Universe, and continues observing to this
day. By now, over 75% of archival WISE imaging at 3-5 microns has been acquired via an ongoing asteroid-hunting mission extension called
NEOWISE. I am leading a wide-ranging, data-intensive effort to repurpose NEOWISE images for science beyond the inner solar system, by
building the deepest ever full-sky maps at 3-5 microns. These coadded maps and their time domain variants have extremely broad implications,
from nearby substellar objects to upcoming constraints on dark energy. I will describe my progress in mining my novel WISE coadds via a new
generation of deep mid-infrared motion surveys, highlighting 1) the Backyard Worlds citizen science project, which is filling in the solar
neighborhood census of cold brown dwarfs not detectable with Gaia, and 2) my searches for 'Planet Nine’, which have yielded the deepest and
widest WISE-based constraints on the possible mid-infrared brightness of this hypothesized planet in our own solar system.

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