Contribution Invited Talk
The VLA Nascent Disk And Multiplicity (VANDAM) Survey of Perseus
The formation of disks and binary systems is thought to begin early in the star formation process. However, there have not been sufficient numbers of young protostars observed with high enough resolution to determine when and where most binaries and disks form. To significantly improve our knowledge of protostellar disks and multiplicity we have carried out the VANDAM survey, a 264 hour Jansky VLA program at wavelengths of 8 mm, 1 cm, 4 cm, and 6 cm toward all known Perseus protostars (N ~ 80) down to 15 AU resolution. The unbiased nature of the survey has enabled us to conduct the most complete characterization of protostellar multiplicity to date, finding evidence for two peaks in the distribution of multiple protostar system separations. Moreover, we have resolved a number of candidate disks toward Class O and I protostars. We have also characterized the free-free jet emission from the protostars and compared it with other outflow diagnostics and the bolometric luminosities. We confirm that the free-free luminosity is correlated with bolometric luminosity, but find evidence for a different power-law relationship depending on the range of luminosities examined. The combined results of this survey demonstrate the power and utility of unbiased surveys toward young stars.