How organics deuteration changes during the formation of a Sun-like star
Date Issued
2017
Author(s)
Bianchi, E.
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Ceccarelli, C.
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Bachiller, R.
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Lefloch, B.
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Abstract
Deuterated molecules have been detected towards the early stages of Sun-like star formation (prestellar cores, Class 0 objects) as well as towards the Solar System; they are a powerful diagnostic tool for studying physical conditions at the moment of the organics formation. However, observations in intermediate stages (Class I/II objects) are still missing. In the framework of the ASAI-IRAM Large Program, we report here the formaldehyde and methanol deuteration as measured in the Class I object SVS13-A. The deuterium fractionation is found to be 9 × 10-2 for HDCO, 5 × 10-3 For D2CO, and 4 × 10-3 for CH_2DOH, up to one order of magnitude lower than the value measured in Class 0 sources. The present measurements of organics deuteration towards the Class I object SVS13-A contribute to fill in the gap between prestellar cores and protoplanetary disks in the context of deuterium fractionation measurements (see \citet{bia17}).
Volume
88
Start page
769
Issn Identifier
0037-8720
Ads BibCode
2017MmSAI..88..769B
Rights
open.access
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