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We report the discovery of a planetary-mass companion, HD 106906 b, with thenew Magellan Adaptive Optics (MagAO) + Clio2 system. The companion is detectedwith Clio2 in three bands: $J$, $K_S$, and $L^\prime$, and lies at a projectedseparation of 7.1'' (650 AU). It is confirmed to be comoving with its $13\pm2$Myr-old F5 host using Hubble Space Telescope/Advanced Camera for Surveysastrometry over a time baseline of 8.3 yr. DUSTY and COND evolutionary modelspredict the companion's luminosity corresponds to a mass of $11\pm2 M_{Jup}$,making it one of the most widely separated planetary-mass companions known. Weclassify its Magellan/Folded-Port InfraRed Echellette $J/H/K$ spectrum asL$2.5\pm1$; the triangular $H$-band morphology suggests an intermediate surfacegravity. HD 106906 A, a pre-main-sequence Lower Centaurus Crux member, wasinitially targeted because it hosts a massive debris disk detected via infraredexcess emission in unresolved Spitzer imaging and spectroscopy. The diskemission is best fit by a single component at 95 K, corresponding to an inneredge of 15-20 AU and an outer edge of up to 120 AU. If the companion is on aneccentric ($e>0.65$) orbit, it could be interacting with the outer edge of thedisk. Close-in, planet-like formation followed by scattering to the currentlocation would likely disrupt the disk and is disfavored. Furthermore, we findno additional companions, though we could detect similar-mass objects atprojected separations $>35$ AU. In situ formation in a binary-star-like processis more probable, although the companion-to-primary mass ratio, at $<1\%$, isunusually small.

HD 106906 b: A planetary-mass companion outside a massive debris disk