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We present spatially resolved 3 um spectra of Elias 1 obtained with anadaptive optics system. The central part of the disk is almost devoid of PAHemission at 3.3 um; it shows up only at 30 AU and beyond. The PAH emissionextends up to 100 AU, at least to the outer boundary of our observation. Thediamond emission, in contrast, is more centrally concentrated, with the columndensity peaked around 30 AU from the star. There are only three Herbig Ae/Bestars known to date that show diamond emission at 3.53 um. Two of them havelow-mass companions likely responsible for the large X-ray flares observedtoward the Herbig Ae/Be stars. We speculate on the origin of diamonds incircumstellar disks in terms of the graphitic material being transformed intodiamond under the irradiation of highly energetic particles.

Spatially Resolved 3 micron Spectroscopy of Elias 1: Origin of Diamonds in Protoplanetary Disks