Mid-Infrared Spectroscopy of the Coldest Known Brown Dwarf 2MASS 0415-0935: Physical Diagnostics and Spectral Modeling

Details Mid-Infrared Spectroscopy of the Coldest Known Brown Dwarf 2MASS 0415-0935: Physical Diagnostics and Spectral Modeling Mid-Infrared Spectroscopy of the Coldest Known Brown Dwarf 2MASS 0415-0935: Physical Diagnostics and Spectral Modeling

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3259b&link_type=abstract

Spitzer Proposal ID #3259

Physics

Scientific paper

We propose to obtain 5-22 micron low-resolution spectroscopy for the coldest known brown dwarf, 2MASS 0415-0935, using the IRS instrument on Spitzer. With an effective temperature of ~700-800 K, this source is a benchmark for the study of low temperature atmospheres and a key starting point for the search for even cooler brown dwarfs. The proposed observations will sample the brightest continuum emission region for this object and resolve many individual molecular features, including the important 10.5 micron band of NH3, the only detectable nitrogen-bearing molecule in a brown dwarf atmosphere and a tracer of atmospheric dynamics. By combining the Spitzer data with high signal-to-noise, moderate resolution optical (0.6-1.0 micron) and near-infrared (1.0-2.4 micron) ground-based data already obtained by our group, and matching to our state-of-the-art spectral models, we will be able to derive the physical properties of this source (temperature, surface gravity, and metallicity), as well as test current opacity models for H2O, CH4, and NH3, critical for modeling and interpreting brown dwarf and planetary atmospheres. The proposed program is a focused experiment for measuring the physical parameters of the coolest brown dwarfs now known and soon to be discovered, and provides a key empirical test of atmosphere models used for both substellar and planetary studies.

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