Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicity

Details Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicity Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicity

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epjwc..1606007l&link_type=abstract

Research, Science and Technology of Brown Dwarfs and Exoplanets: Proceedings of an International Conference held in Shangai on O

Physics

1

Scientific paper

We use Spitzer IRAC 3.6-8.0 μm photometry of late-type T dwarfs to investigate various trends which can aid the planning and interpretation of infrared (IR) surveys for the coldest T or Y dwarfs. Brown dwarfs with effective temperature (Teff)<700 K emit>50% of their flux at λ>3 μm, and the ratio of the mid-IR to the near-IR flux becomes very sensitive to Teff. The color H - [4.5] is a good indicator of Teff with a weak dependence on metallicity ([m/H]) and gravity (g) while H -K and [4.5] - [5.8] are sensitive to [m/H] and g. Thus Teff and g can be constrained and mass and age can then be determined from evolutionary models. There are 12 dwarfs known with H - [4.5] > 3.0 and 500 ≲ Teff K ≲ 800, which we examine in detail. The ages of these dwarfs range from very young (0.1-1.0 Gyr) to old (3-12 Gyr). The mass range is possibly as low as 5 MJup to 70 MJup, and [m/H] also spans a large range of ~ -0.3 to ~ +0.3. The T8-T9 dwarfs found so far in the UKIRT IR Deep Sky Survey are unexpectedly young and low-mass. Extensions to the warm Spitzer and WISE space missions are needed to obtain mid-IR data for cold brown dwarfs, and to discover more of these rare objects.

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