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    Disk And Envelope Structure In Class 0 Protostars. I. The Resolved Massive Disk In Serpens Firs 1

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    Date
    2009-12
    Author
    Enoch, Melissa L.
    Corder, Stuartt
    Dunham, Michael M.
    Duchene, Gaspard
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    Abstract
    We present the first results of a program to characterize the disk and envelope structure of typical Class 0 protostars in nearby low-mass star-forming regions. We use Spitzer Infrared Spectrograph (IRS) mid-infrared spectra, high-resolution Combined Array for Research in Millimeter-wave Astronomy (CARMA) 230 GHz continuum imaging, and two-dimensional radiative transfer models to constrain the envelope structure, as well as the size and mass of the circumprotostellar disk in Serpens FIRS 1. The primary envelope parameters (centrifugal radius, outer radius, outflow opening angle, and inclination) are well constrained by the spectral energy distribution (SED), including Spitzer IRAC and MIPS photometry, IRS spectra, and 1.1 mm Bolocam photometry. These together with the excellent uv-coverage (4.5-500 k lambda) of multiple antenna configurations with CARMA allow for a robust separation of the envelope and a resolved disk. The SED of Serpens FIRS 1 is best fit by an envelope with the density profile of a rotating, collapsing spheroid with an inner (centrifugal) radius of approximately 600 AU, and the millimeter data by a large resolved disk with M(disk) similar to 1.0M(circle dot) and R(disk) similar to 300 AU. These results suggest that large, massive disks can be present early in the main accretion phase. Results for the larger, unbiased sample of Class 0 sources in the Perseus, Serpens, and Ophiuchus molecular clouds are needed to determine if relatively massive disks are typical in the Class 0 stage.
    Department
    Astronomy
    Subject
    infrared: ism
    ism: individual (serpens)
    stars: formation
    submillimeter
    young stellar objects
    spectral energy-distributions
    spitzer-space-telescope
    current star-formation
    molecular cloud
    unbiased submillimeter
    midinfrared surveys
    c2d survey
    cores
    perseus
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/35090
    Citation
    Enoch, Melissa L., Stuartt Corder, Michael M. Dunham, and Gaspard Duch�ne. "Disk and Envelope Structure in Class 0 Protostars. I. The Resolved Massive Disk in Serpens Firs 1." The Astrophysical Journal, Vol. 707, No. 1 (Dec., 2009): 103.
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