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We present a close companion search around sixteen known early-L dwarfs usingaperture masking interferometry with Palomar laser guide star adaptive optics.The use of aperture masking allows the detection of close binaries,corresponding to projected physical separations of 0.6-10.0 AU for the targetsof our survey. This survey achieved median contrast limits of Delta_K ~ 2.3 forseparations between 1.2 - 4 lambda/D, and Delta_K ~ 1.4 at (2/3)lambda/D.  We present four candidate binaries detected with moderate to high confidence(90-98%). Two have projected physical separations less than 1.5 AU. This mayindicate that tight-separation binaries contribute more significantly to thebinary fraction than currently assumed, consistent with spectroscopic andphotometric overluminosity studies.  Ten targets of this survey have previously been observed with the HubbleSpace Telescope as part of companion searches. We use the increased resolutionof aperture masking to search for close or dim companions that would beobscured by full aperture imaging, finding two candidate binaries.  This survey is the first application of aperture masking with laser guidestar adaptive optics at Palomar. Several new techniques for the analysis ofaperture masking data in the low signal to noise regime are explored.

A Close Companion Search around L Dwarfs using Aperture Masking Interferometry and Palomar Laser Guide Star Adaptive Optics