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Mid‐infrared Spectra of Class I Protostars in Taurus

D. M. WatsonDepartment of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171F. KemperSpitzer Fellow, Department of Physics and Astronomy, University of California, Los Angeles, CA 90095-1562Nuria CalvetHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138L. D. KellerDepartment of Physics, Ithaca College, Ithaca, NY 14850Elise FurlanCenter for Radiophysics and Space Research, Cornell University, Space Sciences Building, Ithaca, NY 14853-6801Lee HartmannHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138W. J. ForrestDepartment of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171Christine ChenNational Research Council Resident Research Associate, Jet Propulsion Laboratory, MC 169-506, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109K. I. UchidaCenter for Radiophysics and Space Research, Cornell University, Space Sciences Building, Ithaca, NY 14853-6801Joel D. GreenDepartment of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171B. SargentDepartment of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171G. C. SloanCenter for Radiophysics and Space Research, Cornell University, Space Sciences Building, Ithaca, NY 14853-6801T. HerterCenter for Radiophysics and Space Research, Cornell University, Space Sciences Building, Ithaca, NY 14853-6801Bernhard R. BrandlSterrewacht Leiden, P.O. Box 9513, 2300 RA Leiden, NetherlandsJ. R. HouckCenter for Radiophysics and Space Research, Cornell University, Space Sciences Building, Ithaca, NY 14853-6801Joan NajitaNational Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719Paola D’AlessioP. C. MyersHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138D. J. BarryCenter for Radiophysics and Space Research, Cornell University, Space Sciences Building, Ithaca, NY 14853-6801Peter J. HallCenter for Radiophysics and Space Research, Cornell University, Space Sciences Building, Ithaca, NY 14853-6801P. MorrisSpitzer Science Center/Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125

2004en

ABI

Annotatsiya

We present Spitzer Space Telescope Infrared Spectrograph observations in the 5.3-20 μm range of five young stellar objects in Taurus that have Class I continuum spectral energy distributions (λF αλ , n ≥ 0), often taken to represent the youngest stellar objects in this star formation region. The spectra include a rich collection of broad absorption features that we identify with amorphous silicates and various ices, notably those of carbon dioxide and water. We show that the absorption features are produced mainly in the envelopes of these systems. The apparent depths of silicate and 15.2 μm CO ice features vary among the objects in a manner that is consistent with a variation of inclination with respect to the line of sight, contribution to the silicate features from material throughout the envelopes, and an origin for the CO ice feature in the outer parts of the envelope. Thus, these features provide new and useful constraints on models of the physical structure of Class I protostars. λ 2 2 n

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DOI: 10.1086/422918

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