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The paper presents results from a small survey of 22 young, nearby stars thatwas designed to detect substellar companions and ultimately giant extrasolarplanets down to Jupiter masses. The targets are members of the Tucana and BetaPictoris moving groups apart from the somewhat older star HIP 71395 that has aradial velocity trend suggesting a massive planet in large orbit. The surveywas carried out in the L-band using adaptive optics assisted imaging withNAOS-CONICA (NACO) at the VLT. The chosen observation wavelength is well suitedto search for close companions around young stars and delivers unprecedenteddetection limits. The presented technique reaches some of the bestsensitivities as of today and is currently the most sensitive method for thecontrast limited detection of substellar companions that are cooler than about1000K. The companion to 51 Eri, GJ 3305, was found to be a very close binary onan eccentric orbit. No substellar companions were found around the targetstars, although the method permitted to detect companions down to a few Jupitermasses at orbital distances of typically 5 astronomical units. A planet with amass >1 M_Jup at distances >5 AU around AU Mic can be excluded at the time ofour observations. The absence of detected planets sets constraints on thefrequency distribution and maximum orbital distance of giant exoplanets. Forexample, a radial distribution power law index of 0.2 in combination with amaximum orbital radius exceeding 30 AU can be rejected at a 90% confidencelevel.

A novel L-band imaging search for giant planets in the Tucana and Beta Pictoris moving groups