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CO Depletion and Deuterium Fractionation in Prestellar Cores | | Aurore Bacmann
; Bertrand Lefloch
; Cecilia Ceccarelli
; Juergen Steinacker
; Alain Castets
; Laurent Loinard
; | | Date: |
31 Dec 2002 | | Journal: | Astrophys.J. 585 (2003) L55-L58 | | Subject: | astro-ph | | Affiliation: | 1,2), Bertrand Lefloch , Cecilia Ceccarelli (3,4), Juergen Steinacker , Alain Castets , Laurent Loinard ( ESO Garching, AIU Jena, Observatoire de Grenoble, Observatoire de Bordeaux, UNAM Mexico | | Abstract: | We report the detection of D2CO in a sample of starless dense cores, in which we previously measured the degree of CO depletion. The deuterium fractionation is found extremely high, [D2CO]/[H2CO] ~ 1-10 %, similar to that reported in low-mass protostars. This provides convincing evidence that D2CO is formed in the cold pre-stellar cores, and later desorbed when the gas warms up in protostars. We find that the cores with the highest CO depletions have also the largest [D2CO]/[H2CO] ratios, supporting the theoretical prediction that deuteration increases with increasing CO depletion. | | Source: | arXiv, astro-ph/0301651 | | Services: | Forum | Review | PDF | Favorites | |
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