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We announce the identification of a proper motion companion to the star HII1348, a K5V member of the Pleiades open cluster. The existence of a faint pointsource 1.1arcsec away from HII 1348 was previously known from adaptive opticsimaging by Bouvier et al. However, because of a high likelihood of backgroundstar contamination and in the absence of follow-up astrometry, Bouvier et al.tentatively concluded that the candidate companion was not physicallyassociated with HII 1348. We establish the proper motion association of thepair from adaptive optics imaging with the Palomar 5m telescope. Adaptiveoptics spectroscopy with the integral field spectrograph OSIRIS on the Keck 10mtelescope reveals that the companion has a spectral type of M8\pm1. Accordingto substellar evolution models, the M8 spectral type resides within thesubstellar mass regime at the age of the Pleiades. The primary itself is aknown double-lined spectroscopic binary, which makes the resolved companion,HII 1348B, the least massive and widest component of this hierarchical triplesystem and the first substellar companion to a stellar primary in the Pleiades.

A Substellar Common Proper Motion Companion to the Pleiad HII 1348