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

Abstract

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 um shadow. HHT observations of 12CO 2 --> 1 confirm the detection of a flattened molecular core with diameter ~10000 AU and the same orientation as the circumstellar disk (~100 to 200 AU in diameter). This structure is probably the same as that generating the 8.0 um shadow and is expected from theoretical simulations of collapsing embedded protostars. We estimate the mass of the protostar to be only ~5% of the mass of the parent globule.

15 pages, 17 figures, emulateapj format, accepted for publication in ApJ

References in corpus (6)

• Spectral Mapping Reconstruction of Extended Sources
• A Flattened Protostellar Envelope in Absorption around L1157
• Molecular Line Emission from Massive Protostellar Disks: Predictions for ALMA and the EVLA
• Highly Collimated Jets and Wide-Angle Outflows in HH46/47: New Evidence from Spitzer IR Images
• Herbig-Haro flows in B335
• Spitzer observations of a 24 micron shadow: Bok Globule CB190

Cited by in corpus (13)

• Observations of Infalling and Rotational Motions on a 1,000-AU Scale around 17 Class 0 and 0/I Protostars: Hints of Disk Growth and Magnetic Braking?
• Investigating Protostellar Accretion-Driven Outflows Across the Mass Spectrum: JWST NIRSpec IFU 3-5~$\mu$m Spectral Mapping of Five Young Protostars
• Characterizing the Youngest Herschel-detected Protostars I. Envelope Structure Revealed by CARMA Dust Continuum Observations
• Magnetically regulated collapse in the B335 protostar? II. Observational constraints on gas ionization and magnetic field coupling
• Large-scale magnetic fields in Bok globules
• Chemical Differentiation and Temperature Distribution on a Few au Scale around the Protostellar Source B335
• Models of Rotating Infall for the B335 Protostar
• Intensity-Corrected Herschel Observations of Nearby Isolated Low-Mass Clouds
• JCMT POL-2 and ALMA polarimetric observations of 6000-100 au scales in the protostar B335: linking magnetic field and gas kinematics in observations and MHD simulations
• Spitzer Observations of L429: A Near-collapse or Collapsing Starless Core
• Evolution of Chemistry in the envelope of Hot Corinos (ECHOS). I. Extremely young sulphur chemistry in the isolated Class 0 object B335
• Constraining Spatial Densities of Early Ice Formation in Small Dense Molecular Cores from Extinction Maps
• Structured velocity field in the inner envelope of B335: ALMA observations of rare CO isotopologues