From Infall to Rotation Around Young Stellar Objects
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.
Additional Information
© 2002 Springer-Verlag Berlin Heidelberg. First Online: 15 October 2003.Additional details
- Eprint ID
- 95304
- Resolver ID
- CaltechAUTHORS:20190507-131843305
- Created
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2019-05-07Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences