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S.M. Sonnett (CfA/CofC), M. Marengo, B.M. Patten (CfA), K.L. Luhman (Penn State), M.T. Schuster (CfA/Minnesota), G.G. Fazio (CfA)
We present new Spitzer/IRAC photometry for eight brown dwarfs with spectral types of T3 and later. These data are used to investigate trending seen with color and spectral-type for both IRAC colors alone and IRAC data combined with near-IR JHK photometry. We make use of a sample of T dwarfs with measured trigonometric parallaxes previously observed by IRAC (i.e., Patten et al. 2005, AAS 205, 1110) to determine linear relations between color and absolute magnitude for spectral types T3 and later for IRAC and near-IR JHK photometry. These relations were used to estimate distances for the eight T dwarfs observed with IRAC in this program as part of a search for widely-separated companions to these brown dwarfs. IRAC photometry for about 3100 sources in total was examined for the eight target fields. No candidate companions of equal or lesser mass to the target brown dwarfs were identified in our data for separations of about 40 AU - 1500 AU from the primary (for the median distance of the T dwarfs in this sample of 11 parsecs). This research was funded in part by the SAO Summer Intern Program. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407. Support for the IRAC instrument was provided by NASA under contract number 1256790 issued by JPL.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.