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We present observations of the Class 0 protostar L1157-mm using the CombinedArray for Research in Millimeter-wave Astronomy (CARMA) in 3 mm dust continuumand N2H+ line emission. In the N2H+ line, we detect a large-scale envelopeextended over a linear size of ~20,000AU flattened in the directionperpendicular to the outflow. This N2H+ feature coincides with the outerenvelope seen in the 8 micron extinction by Looney et al. Meanwhile, the dustcontinuum traces the compact, nearly spherical structure of the inner envelope,where N2H+ becomes depleted. This highly flattened N2H+ envelope also showsdynamical signatures consistent with gravitational infall in the inner region,but a slow, solid-body rotation at large scales. This flattened structure isnot a rotationally supported circumstellar disk; instead, it resembles aprestellar core both morphologically and kinematically, representing the earlyphase of a Class 0 system. In this paper, we construct a simple model tointerpret both the dust continuum and N2H+ emission and suggest a possibledynamical scenario for the overall properties of the envelope.

Probing the Protostellar Envelope around L1157: the Dust and Gas Connection