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Over the last five years, we have used infrared photometry from 2MASS to compile a census of nearby ultracool M and L dwarfs (Cruz et al, 2003; 2006). We have identified 87 L dwarfs in 80 systems with nominal distances less than 20 parsecs from the Sun. This is the first true L dwarf census – a large-scale, volume-limited sample. Most distances are based on spectroscopic parallaxes, accurate to 20%, which is adequate for present purposes. Fifty systems already have high-resolution imaging, including our Cycle 9 and 13 snapshot programs, #8581 and #10143; nine are in binary or multiple systems, including six new discoveries. We propose to target the remaining sources via the current proposal.  the current proposal. We will combine those data with X-ray measurements made in our Cycle 14 Chandra proposal #2095.

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Over the last five years, 2MASS infrared photometry has been used to compile a census of nearby ultracool M and L dwarfs (Cruz et al, 2003; 2006). 87 L dwarfs in 80 systems have been identified with nominal distances less than 20 parsecs from the Sun. This is the first true L dwarf census – a large-scale, volume-limited sample. Most distances are based on spectroscopic parallaxes, accurate to 20%, which is adequate for present purposes. Fifty systems already have high-resolution imaging, including the Cycle 9 and 13 snapshot programs, #8581 and #10143; nine are in binary or multiple systems, including six new discoveries. We propose to target the remaining sources via the the current proposal. . Those data will be combined with Chandra X-ray measurements from program #2095 (Reid, priv. comm.).

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