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From Infall to Rotation Around Young Stellar Objects

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The Origins of Stars and Planets: The VLT View

Part of the book series: ESO Astrophysics Symposia ((ESO))

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Abstract

We present evidence of a short-lived, transitional stage between the fully embedded and optically visible stages of low-mass star formation. This stage is characterized by a large (2000 AU radius) disk with close-to Keplerian motions, but with a significant inward component to the velocity field. Millimeter-interferometric observations of HCO+ J=1−0 and 3-2 first identified this structure around the embedded object L1489 IRS, with inward motions present on scales of several hundred AU. Subsequent R ≈ 25, 000 M-band spectroscopy showed that the inward motions extend to within 0.1 AU from the star. We conclude that angular-momentum transfer is crucial in determining the final density distribution in the disk and the initial conditions for planet formation.

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Author information

Authors and Affiliations

  1. Radio Astronomy Laboratory, University of California, 601 Campbell Hall #3411, Berkeley, CA, 94720-3411, USA

    Michiel R. Hogerheijde

  2. Downs Laboratory of Physics 320-47, California Institute of Technology, Pasadena, CA, 91125, USA

    Adwin C. A. Boogert

  3. Sterrewacht Leiden, P.O. Box 9513, 2300 RA, Leiden, The Netherlands

    Ewine F. van Dishoeck

  4. Division of Geological and Planetary Sciences 150-21, California Institute of Technology, Pasadena, CA, 91125, USA

    Geoffrey A. Blake

Authors
  1. Michiel R. Hogerheijde
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  2. Adwin C. A. Boogert
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  3. Ewine F. van Dishoeck
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  4. Geoffrey A. Blake
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Editor information

Editors and Affiliations

  1. European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748, Garching, Germany

    João F. Alves

  2. Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482, Potsdam, Germany

    Mark J. McCaughrean

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© 2002 Springer-Verlag Berlin Heidelberg

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Hogerheijde, M.R., Boogert, A.C.A., van Dishoeck, E.F., Blake, G.A. (2002). From Infall to Rotation Around Young Stellar Objects. In: Alves, J.F., McCaughrean, M.J. (eds) The Origins of Stars and Planets: The VLT View. ESO Astrophysics Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-40277-1_6

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  • DOI: https://doi.org/10.1007/978-3-662-40277-1_6

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-662-39255-3

  • Online ISBN: 978-3-662-40277-1

  • eBook Packages: Springer Book Archive

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