High Resolution Imaging of the Protostellar Envelope around L1551 IRS 5: Growth of the Circumstellar Disk

Details High Resolution Imaging of the Protostellar Envelope around L1551 IRS 5: Growth of the Circumstellar Disk High Resolution Imaging of the Protostellar Envelope around L1551 IRS 5: Growth of the Circumstellar Disk

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..221m&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

Computer Science

Scientific paper

We report aperture synthesis C18O (J=1-0) observations of L1551 IRS 5 with a spatial resolution of 2.8'' x 2.5'' using the Nobeyama Millimeter Array. We have detected an emission component centrally condensed around IRS 5, as well as a diffuse component extending in the north-south direction from the centrally condensed component. The centrally condensed component, 0.062Modot in mass and 2380 AU x 1050 AU in size, is elongated in the direction perpendicular to the outflow axis, indicating the existence of a disklike protostellar envelope. The position-velocity diagrams reveal that the velocity field in the centrally condensed component is composed of infall and rotation. The infall velocity in the outer part is equal to the free-fall velocity around a central mass of 0.1 Modot, e.g., 0.5 km s-1 at r=700 AU, while the rotation velocity, 0.24 km s-1 at the same radius, gets prominent at inner radii with a radial dependence of r-1. These velocity laws suggest that the rotation velocity becomes equal to the infall velocity at r 160 AU, and that the infall motion shifts to the centrifugally supported motion around this radius. The mass infall rate in the envelope is estimated to be 6 x 10-6 Modot yr-1.

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