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We model Spitzer Space Telescope observations of the Taurus Class 0 protostarL1527 IRS (IRAS 04368+2557) to provide constraints on its protostellar envelopestructure. The nearly edge-on inclination of L1527 IRS, coupled with the highlyspatially-resolved near to mid-infrared images of this object and the detailedIRS spectrum, enable us to constrain the outflow cavity geometry quite well,reducing uncertainties in the other derived parameters. The mid-infraredscattered light image shows a bright central source within a dark lane; theaspect ratio of this dark lane is such that it appears highly unlikely to be adisk shadow. In modeling this dark lane, we conclude that L1527 IRS is probablynot described by a standard TSC envelope with simple bipolar cavities. We findit necessary to model the dark lane and central source as a modified innerenvelope structure. This structure may be due either to a complex wind-envelopeinteraction or induced by the central binary. To fit the overall SED, werequire the central source to have a large near to mid-infrared excess,suggesting substantial disk accretion. Our model reproduces the overallmorphology and surface brightness distribution of L1527 IRS fairly well, giventhe limitations of using axisymmetric models to fit the non-axisymmetric realobject, and the derived envelope infall rates are in reasonable agreement withsome other investigations. IRAC observations of L1527 IRS taken 12 months apartshow variability in total flux and variability in the opposing bipolarcavities, suggesting asymmetric variations in accretion. We also provide modelimages at high resolution for comparison to future observations with currentground-based instrumentation and future space-based telescopes.

Constraining the Envelope Structure of L1527 IRS: Infrared Scattered Light Modeling