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L1157-B1, a factory of complex organic molecules in a Solar-type star forming region | | B. Lefloch
; C. Ceccarelli
; C. Codella
; C. Favre
; L. Podio
; C. Vastel
; S. Viti
; R. Bachiller
; | | Date: |
15 Apr 2017 | | Abstract: | We report on a systematic search for oxygen-bearing Complex Organic Molecules
(COMs) in the Solar-like protostellar shock region L1157-B1, as part of the
IRAM Large Program "Astrochemical Surveys At IRAM" (ASAI). Several COMs are
unambiguously detected, some for the first time, such as ketene H$_2$CCO,
dimethyl ether (CH$_3$OCH$_3$) and glycolaldehyde (HCOCH$_2$OH), and others
firmly confirmed, such as formic acid (HCOOH) and ethanol (C$_2$H$_5$OH).
Thanks to the high sensitivity of the observations and full coverage of the 1,
2 and 3mm wavelength bands, we detected numerous (10--125) lines from each of
the detected species. Based on a simple rotational diagram analysis, we derive
the excitation conditions and the column densities of the detected COMs.
Combining our new results with those previously obtained towards other
protostellar objects, we found a good correlation between ethanol, methanol and
glycolaldehyde. We discuss the implications of these results on the possible
formation routes of ethanol and glycolaldehyde. | | Source: | arXiv, 1704.4646 | | Services: | Forum | Review | PDF | Favorites | |
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