Probing magnetic-field morphology in protostellar envelopes with the CARMA 1.3mm dual-polarization receiver system

We present a summary of λ 1.3 mm CARMA observations of dust polarization toward 30 star-forming cores from the TADPOL survey. TADPOL is the largest survey of low-mass star-forming cores to date, and was the first major project to be undertaken with the 1.3 mm full-Stokes polarization system at CARMA. Here we show maps from a selection of sources, and we compare the ~ 2.5^" resolution TADPOL maps with ~ 20^" resolution polarization maps from single-dish submillimeter telescopes. We discuss two main findings: (1) A subset of the sources have consistent magnetic field (B-field) orientations between large (~ 20^") and small (~ 2.5^") scales. Those same sources also tend to have higher fractional polarizations than the sources with inconsistent large-to-small-scale fields. We interpret this to mean that in at least some cases B-fields play a role in regulating the infall of material all the way down to the ~ 1000 AU scales of protostellar envelopes. (2) Outflows appear to be randomly aligned with B-fields; although, in sources with low polarization fractions, there is a hint that outflows are preferentially perpendicular to small-scale B-fields, which suggests that in these sources the fields have been wrapped up by envelope rotation.