THE MAGNETIC FIELD MORPHOLOGY OF THE CLASS 0 PROTOSTAR L1157-mm

Abstract

We present the first detection of polarization around the Class 0 low-mass\nprotostar L1157-mm at two different wavelengths. We show polarimetric maps at\nlarge scales (10" resolution at 350 um) from the SHARC-II Polarimeter and at\nsmaller scales (1.2"-4.5" at 1.3 mm) from the Combined Array for Research in\nMillimeter-wave Astronomy (CARMA). The observations are consistent with each\nother and show inferred magnetic field lines aligned with the outflow. The\nCARMA observations suggest a full hourglass magnetic field morphology centered\nabout the core; this is only the second well-defined hourglass detected around\na low-mass protostar to date. We apply two different methods to CARMA\npolarimetric observations to estimate the plane-of-sky magnetic field\nmagnitude, finding values of 1.4 and 3.4 mG.\n