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We present the results from a Submillimeter Array survey of the 887 microncontinuum emission from the protoplanetary disks around 95 young stars in theyoung cluster NGC 2024. Emission was detected from 22 infrared sources, withflux densities from ~5 to 330 mJy; upper limits (at 3sigma) for the other 73sources range from 3 to 24 mJy. For standard assumptions, the correspondingdisk masses range from ~0.003 to 0.2Msolar, with upper limits at0.002--0.01Msolar. The NGC 2024 sample has a slightly more populated tail atthe high end of its disk mass distribution compared to other clusters, butwithout more information on the nature of the sample hosts it remains unclearif this difference is statistically significant or a superficial selectioneffect. Unlike in the Orion Trapezium, there is no evidence for a disk massdependence on the (projected) separation from the massive star IRS2b in the NGC2024 cluster. We suggest that this is due to either the cluster youth or acomparatively weaker photoionizing radiation field.

Protoplanetary Disk Masses in the Young NGC 2024 Cluster