DISK AND ENVELOPE STRUCTURE IN CLASS 0 PROTOSTARS. II. HIGH-RESOLUTION MILLIMETER MAPPING OF THE SERPENS SAMPLE

Abstract

We present high-resolution CARMA 230 GHz continuum imaging of nine deeply\nembedded protostars in the Serpens Molecular Cloud, including six of the nine\nknown Class 0 protostars in Serpens. This work is part of a program to\ncharacterize disk and envelope properties for a complete sample of Class 0\nprotostars in nearby low-mass star forming regions. Here we present CARMA maps\nand visibility amplitudes as a function of uv-distance for the Serpens sample.\nObservations are made in the B, C, D, and E antenna configurations, with B\nconfiguration observations utilizing the CARMA Paired Antenna Calibration\nSystem. Combining data from multiple configurations provides excellent\nuv-coverage (4-500 klam), allowing us to trace spatial scales from 1e2 to 1e4\nAU. We find evidence for compact disk components in all of the observed Class 0\nprotostars, suggesting that disks form at very early times (t<0.2 Myr) in\nSerpens. We make a first estimate of disk masses using the flux at 50 klam,\nwhere the contribution from the envelope should be negligible, assuming an\nunresolved disk. The resulting disk masses range from 0.04 Msun to 1.7 Msun,\nwith a mean of approximately 0.2 Msun. Our high resolution maps are also\nsensitive to binary or multiple sources with separations > 250 AU, but\nsignificant evidence of multiplicity on scales <2000 AU is seen in only one\nsource.\n