Spitzer and HHT Observations of Bok Globule B335: Isolated Star Formation Efficiency and Cloud Structure

We present infrared and millimeter observations of Barnard 335, the prototypical isolated Bok globule with an embedded protostar. Using Spitzer data we measure the source luminosity accurately; we also constrain the density profile of the innermost globule material near the protostar using the observation of an 8.0 [mu]m shadow. Heinrich Hertz Telescope (HHT) observations of super(12)CO 2-1 confirm the detection of a flattened molecular core with diameter [image]10,000 AU and the same orientation as the circumstellar disk ([image]100 to 200 AU in diameter). This structure is probably the same as that generating the 8.0 [mu]m shadow and is expected from theoretical simulations of collapsing embedded protostars. We estimate the mass of the protostar to be only [image]5% of the mass of the parent globule.