Hunting the Coolest Substellar Dwarfs in the Northern Hemisphere

Details Hunting the Coolest Substellar Dwarfs in the Northern Hemisphere Hunting the Coolest Substellar Dwarfs in the Northern Hemisphere

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011noao.prop..161z&link_type=abstract

NOAO Proposal ID #2011A-0161

Physics

Scientific paper

The few lowest mass substellar objects discovered in previous imaging surveys are found to have large semi-major axes, typically hundreds of AU. We show that at such large separations and toward old stars one has the best chance to detect the coolest dwarfs, with effective temperatures of <=500 K (the so-called ``Y dwarfs''). Effective temperatures of 500 K represent a region of temperature space that has yet to be probed. As such, the discovery of such cool objects will illuminate their physics and chemistry and will provide observational data to test planetary models. To discover one or more Y dwarfs, we are proposing to continue our survey with FLAMINGOS of northern hemisphere white dwarfs with ages >2 Gyr that lie within 25 pc of Earth. These observations will complement our southern hemisphere survey with ISPI and NEWFIRM at CTIO.

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