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Abstract: Deep Spitzer IRAC images of L1157 reveal many of the details of the outflowand the circumstellar environment of this Class 0 protostar. In IRAC band 4, 8microns, there is a flattened structure seen in absorption against thebackground emission. The structure is perpendicular to the outflow and isextended to a diameter of 2 arcminutes. This structure is the first cleardetection of a flattened circumstellar envelope or pseudo-disk around a Class 0protostar. Such a flattened morphology is an expected outcome for many collapsetheories that include magnetic fields or rotation. We construct an extinctionmodel for a power-law density profile, but we do not constrain the densitypower-law index.

Autor: Leslie Looney, John Tobin, Woojin Kwon

Fuente: https://arxiv.org/

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