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Published April 1, 2015 | Published + Submitted
Journal Article Open

Protoplanetary Disk Masses in the Young NGC 2024 Cluster


We present the results from a Submillimeter Array survey of the 887 μm continuum emission from the protoplanetary disks around 95 young stars in the young cluster NGC 2024. Emission was detected from 22 infrared sources, with flux densities from ~5 to 330 mJy; upper limits (at 3σ) for the other 73 sources range from 3 to 24 mJy. For standard assumptions, the corresponding disk masses range from ~0.003 to 0.2 M_☉, with upper limits at 0.002–0.01 M_☉. The NGC 2024 sample has a slightly more populated tail at the high end of its disk mass distribution compared to other clusters, but without more information on the nature of the sample hosts it remains unclear if this difference is statistically significant or a superficial selection effect. Unlike in the Orion Trapezium, there is no evidence for a disk mass dependence on the (projected) separation from the massive star IRS 2b in the NGC 2024 cluster. We suggest that this is due to either the cluster youth or a comparatively weaker photoionizing radiation field.

Additional Information

© 2015 American Astronomical Society. Received 2014 October 6; accepted 2015 January 26; published 2015 March 24. We thank the referee for a very helpful review. The Submillimeter Array is a joint project between the Submillimeter Astrophysical Observatory and the Academica Sinica Institute of Astronomy and Astrophysics and is funded by the Smithsonian Institution and the Academica Sinica.

Attached Files

Published - 0004-637X_802_2_77.pdf

Submitted - 1501.06512v1.pdf


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