4.6 Article

Resolved spectroscopy of M dwarf/L dwarf binaries. I. Denis J220002.05-303832.9AB

Journal

ASTRONOMICAL JOURNAL
Volume 131, Issue 2, Pages 1007-1014

Publisher

IOP PUBLISHING LTD
DOI: 10.1086/499042

Keywords

binaries : visual; stars : individual (DENIS J220002.05-303832.9) stars : low-mass; brown dwarfs

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We present the discovery of the common proper motion M9+L0 binary DENIS J220002.05-303832.9AB, identified serendipitously with the SpeX near-infrared imager/spectrograph. Spectral types are derived from resolved near-infrared spectroscopy of the well-separated (1.09 +/- 0.06) components and comparison to equivalent data for M and L dwarf spectral standards. Physical association is deduced from the angular proximity of the sources, their common proper motion, and their similar spectrophotometric distances ( 35 +/- 2 pc). The estimated distance of this pair implies a projected separation of 38 +/- 3 AU, wider than typical separations for other M dwarf/L dwarf binaries but consistent with the maximum separation/total system mass trend previously identified by Burgasser et al. We discuss the DENIS 2200-3038AB system in context with other low-mass binaries and its role in the study of dust formation processes and activity trends across the transition between the M and L dwarf spectral classes.

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