Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...519l.173g&link_type=abstract
The Astrophysical Journal, Volume 519, Issue 2, pp. L173-L176.
Astronomy and Astrophysics
Astronomy
22
Accretion, Accretion Disks, Ism: Individual: Alphanumeric: L1157, Ism: Molecules, Stars: Formation, Stars: Pre-Main-Sequence
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. Using the Caltech Owens Valley Millimeter Array with a synthesized beam size of 2", we detect spatially unresolved methanol emission in the 2_k-1_k transitions at 3 mm wavelength, 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 ~2x10^-8 in the flat disk model and ~3x10^-7 for the surface layer of a flared disk. The large variation in the fractional abundance between the warm portion of the flared disk and the disk as a whole makes it plausible that substantial chemical processing via depletion and desorption has occurred.
Goldsmith Paul F.
Langer William D.
Velusamy Thangasamy
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