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We present the first near-IR scattered light detection of the transitionaldisk associated with the Herbig Ae star MWC 758 using data obtained as part ofthe Strategic Exploration of Exoplanets and Disks with Subaru, and 1.1 micronHST/NICMOS data. While sub-millimeter studies suggested there is adust-depleted cavity with r=0.35, we find scattered light as close as 0.1(20-28 AU) from the star, with no visible cavity at H, K', or Ks. We find twosmall-scaled spiral structures which asymmetrically shadow the outer disk. Wemodel one of the spirals using spiral density wave theory, and derive a diskaspect ratio of h ~ 0.18, indicating a dynamically warm disk. If the spiralpattern is excited by a perturber, we estimate its mass to be 5+3,-4 Mj, in therange where planet filtration models predict accretion continuing onto thestar. Using a combination of non-redundant aperture masking data at L' andangular differential imaging with Locally Optimized Combination of Images at K'and Ks, we exclude stellar or massive brown dwarf companions within 300 mas ofthe Herbig Ae star, and all but planetary mass companions exterior to 0.5. Wereach 5-sigma contrasts limiting companions to planetary masses, 3-4 MJ at 1.0and 2 MJ at 1.55 using the COND models. Collectively, these data strengthen thecase for MWC 758 already being a young planetary system.

Spiral Arms in the Asymmetrically Illuminated Disk of MWC 758 and Constraints on Giant Planets