Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.6816g&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #68.16; Bulletin of the American Astronomical Society, Vol. 31, p.934
Astronomy and Astrophysics
Astronomy
Scientific paper
We report the detection of emission from methanol in a compact source coincident with the position of the L1157 infrared source, which we attribute to molecules in the disk surrounding this young, Class 0 protostellar object. In addition, we identify a spectral feature in the outflow corresponding to an ethanol transition. Using the Caltech Owens Valley Millimeter Array with a synthesized beam size of 2arcsec , we detect spatially unresolved methanol in the 2_k -- 1_k transitions at 3mm, which is coincident in position with the peak of the continuum emission. The gas phase methanol could be located in the central region (< 100 AU radius) of a flat disk, or in an extended heated surface layer ( ~ 200 AU radius) of a flared disk. The fractional abundance of methanol X(CH_3OH) is ~ 2x 10(-8) in the flat disk model, and ~ 3x 10(-7) for the flared di sk. The fractional abundance is small in the disk as a whole, but considerably larger in the warm portions. This difference indicates that substantial chemical processing probably takes place in the disk via depletion and desorption.
Goldsmith Paul F.
Langer William D.
Velusamy Thangasamy
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