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A Direct Measurement of the CO Depletion in the Elias 18 Circumstellar Disk

Authors
  • R Y, Shuping
  • Jean Chiar
  • Theodore P, Snow
  • Thomas, Kerr
Type
Published Article
Journal
The Astrophysical Journal Letters
Publication Date
Jan 23, 2001
Volume
547
Issue
2
Pages
161–161
Source
SETI Institute
License
Unknown

Abstract

In this Letter we present low-resolution 2.3 μm and high-resolution 4.6 μm spectra of Elias 18 (IRAS 04369+ 2539), a low-mass young stellar object (YSO) in the Taurus molecular cloud. The 2.3 μm spectrum shows CO band head emission (v= 2-0) indicating a circumstellar disk. The 4.6 μm spectrum shows very weak CO absorption in the lowest J levels. Comparing preexisting CO ice observations to our data indicates that there is at least 30 times less gas-phase CO than solid-state CO in the outer, cold (T< 20 K) regions of the ...

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