An SMA continuum survey of circumstellar disks in the Serpens star-forming region.
LAW C.J., RICCI L., ANDREWS S.M., WILNER D.J. and QI C.
Abstract (from CDS):
We present observations with the Submillimeter Array of the continuum emission at λ=1.3 mm from 62 young stars surrounded by a protoplanetary disk in the Serpens star-forming region. The typical angular resolution for the survey in terms of beam size is 3′′ / . 5×2′′ / . 5 with a median rms noise level of 1.6 mJy beam–1. These data are used to infer the dust content in disks around low-mass stars (0.1–2.5 M☉) at a median stellar age of 1-3 Myr. Thirteen sources were detected in the 1.3 mm dust continuum with inferred dust masses of ~10–260 M⊕ and an upper limit to the median dust mass of 5.1–4.3+6.1 M⊕, derived using survival analysis. Comparing the protoplanetary disk population in Serpens to those of other nearby star-forming regions, we find that the populations of dust disks in Serpens and Taurus, which have a similar age, are statistically indistinguishable. This is potentially surprising as Serpens has a stellar surface density two orders of magnitude in excess of Taurus. Hence, we find no evidence that dust disks in Serpens have been dispersed as a result of more frequent and/or stronger tidal interactions due to its elevated stellar density. We also report that the fraction of Serpens disks with Mdust 10 M⊕ is less than 20%, which supports the notion that the formation of giant planets is likely inherently rare or has substantially progressed by a few Myr.