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Direct imaging in the infrared at the diffraction limit of large telescopesis a unique probe of the properties of young planetary systems. We survey 55single class I and class II stars in Taurus in the L' filter using natural andlaser guide star adaptive optics and the near-infrared camera (NIRC2) of theKeck II telescope, in order to search for planetary mass companions. We useboth reference star differential imaging and kernel phase techniques, achievingtypical 5-sigma contrasts of ~6 magnitudes at separations of 0.2" and ~8magnitudes beyond 0.5". Although we do not detect any new faint companions, weconstrain the frequency of wide separation massive planets, such as HR 8799analogues. We find that, assuming hot-start models and a planet distributionwith power-law mass and semi-major axis indices of -0.5 and -1, respectively,less than 20% of our target stars host planets with masses >2 MJ at separations>10 AU.

High-resolution survey for planetary companions to young stars in the Taurus Molecular Cloud