Component Spectral Types of L- and T-Dwarf Binaries from Combined-Light Spectroscopy and Resolved Photometry

Details Component Spectral Types of L- and T-Dwarf Binaries from Combined-Light Spectroscopy and Resolved Photometry Component Spectral Types of L- and T-Dwarf Binaries from Combined-Light Spectroscopy and Resolved Photometry

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743414b&link_type=abstract

American Astronomical Society, AAS Meeting #217, #434.14; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Brown dwarf binaries are predominantly tightly-bound systems, generally resolved through high-resolution imaging. While resolved photometry allows some characterization of the components of these systems, resolved spectroscopy is necessary to study their atmospheres in detail. However, such data has been difficult to obtain. Here we present an alternative method of extracting component spectroscopic information, through the application of a constrained spectral template matching technique. We compare combined-light near-infrared spectra of fifteen L- and T-dwarf binaries to binary templates drawn from the SpeX Prism Spectral Libraries, with each template constrained by at least three relative magnitude measurements. For these, we infer the component spectral types and relative JHK magnitudes of the binaries and detail the degree of J-band brightening for binaries stradling the L-dwarf/T-dwarf transition. We place the components of binaries with parallax measurements on near-infrared color-magnitude diagrams, and compare the results to current absolute magnitude/spectral type trends.

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