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We report the discovery of a young planetary-mass brown dwarf in the rho Ophcloud core. The object was identified as such with the aid of a 1.5-2.4 micronlow-resolution spectrum obtained using the NIRC instrument on the Keck Itelescope. Based on the COND model, the observed spectrum is consistent with areddened (Av ~ 15-16) brown dwarf whose effective temperature is in the range1200-1800 K. For an assumed age of 1 Myr, comparison with isochrones furtherconstrains the temperature to ~ 1400 K and suggests a mass of ~ 2-3 Jupitermasses. The inferred temperature is suggestive of an early T spectral type,which is supported by spectral morphology consistent with weak methaneabsorption. Based on its inferred distance (~ 100 pc) and the presence ofoverlying visual absorption, it is very likely to be a rho Oph cluster member.In addition, given the estimated spectral type, it may be the youngest andleast massive T dwarf found so far. Its existence suggests that the initialmass function for the rho Oph star-forming region extends well into theplanetary-mass regime.

A Young Planetary-Mass Object in the rho Oph Cloud Core