The Masses of the Orion Proplyds from Submillimeter Dust Emission

Astrophysics, abstract
astro-ph/0506225

From: Jonathan Williams [view email]

Date: Fri, 10 Jun 2005 03:45:17 GMT   (402kb)

We have imaged the 880 micron continuum emission from the "proplyds" in the
center of the Trapezium Cluster in Orion using the Submillimeter Array with a
beam size 1.5” FWHM and an rms of 2.7 mJy. Five sources are detected with
fluxes in the range 18 to 38 mJy, which includes dust emission from four
proplyds and ionized gas from theta1 Ori G. The total masses of the detected
proplyds derived from their dust emission range from 0.013 to 0.024 Msun
assuming a dust temperature of 20 K and mass opacity of 0.03 cm^2/g. Eighteen
other proplyds within the field of view are not detected individually, but the
flux distribution toward their locations is slightly higher than the background
and has an average value of 1.1 mJy which corresponds to a mass of 8e-4 Msun.
The four detected proplyds have sufficient disk mass bound to their central
stars to form planetary systems on the scale of our Solar System.

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