Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50367c&link_type=abstract
Spitzer Proposal ID #50367
Computer Science
Scientific paper
Theoretical models of ultracool atmospheres are fundamental tools for understanding and characterizing brown dwarfs and extrasolar planets. However, current tests of these models are impeded by the heterogenous nature of field L and T dwarfs. We propose to circumvent this limitation by studying a careful chosen set of ultracool dwarfs with independently determined ages and/or masses. These 'benchmark' objects can provide the most stringent tests currently possible for atmospheric models, a factor of ~5 more precise than typical field objects. With our proposed IRS Short-Low spectroscopy and IRAC photometry, in combination with existing optical/near-IR spectroscopy, we will construct high S/N 0.9-14.5 SEDs and compare to state-of-the-art theoretical atmospheric models. The mid-IR provides essential information about several fundamental spectral diagnostics (CO, H2O, CH4, and NH3) and the overall emergent flux. Thus, our proposed Spitzer observations are critical to testing and thereby improving the models. Without these data, such precise tests of ultracool atmospheres will not be possible until the availability of JWST.
Cushing Michael
Dupuy Trent
Liu Michael
Marley Mark
Saumon Didier
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