Hunting the Coolest Substellar Dwarfs

Details Hunting the Coolest Substellar Dwarfs Hunting the Coolest Substellar Dwarfs

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70102z&link_type=abstract

Spitzer Proposal ID #70102

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 brown dwarf companions, with effective temperatures of <500 K (the so-called 'Y dwarfs''). Effective temperatures of 500 K represent a region of temperature space that is only recently being probed for free floating brown dwarfs. 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 conducting a survey of white dwarfs with ages >2 Gyr that lie within 35 pc of Earth. As companions to white dwarfs, we will be able to determine the ages of any cool brown dwarfs we find and thus constrain their masses.

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