2011A&A...528L..13R


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST15:35:59

2011A&A...528L..13R - Astronomy and Astrophysics, volume 528, L13-13 (2011/4-1)

The puzzling deuteration of methanol in low- to high-mass protostars.

RATAJCZAK A., TAQUET V., KAHANE C., CECCARELLI C., FAURE A. and QUIRICO E.

Abstract (from CDS):

The current theory of methanol deuteration on interstellar grains predicts that the abundance ratio of the singly deuterated isotopologues [CH2DOH]/[CH3OD] should always be ∼3. In warm regions where grain mantles have sublimated, gaseous methanol is detectable via its rotational transitions. In previous observational studies, the gas-phase [CH2DOH]/[CH3OD] ratio was measured and found to be significantly larger than 3 in low-mass protostars and close to 1 in the Orion IRc2 massive hot core. We present new measurements of the gas-phase [CH2DOH]/[CH3OD] ratio in two additional high-mass protostars, as well as in two intermediate-mass protostars, to either confirm or exclude the dependence of this ratio on the mass of the protostar. The observations were carried out using the IRAM-30m telescope. Several rotational lines of each isotopologue were detected toward the intermediate-mass protostars, while only CH3OD lines were detected in the massive hot cores. The ratio [CH2DOH]/[CH3OD] (or its upper limit) was computed from both the averaged column densities and directly from line flux ratios. Our results confirm that the [CH2DOH]/[CH3OD] ratio is substantially lower in massive hot cores than in (low-mass) hot-corinos, by typically one order of magnitude. Furthermore, they suggest that intermediate-mass protostars have similar properties to low-mass protostars. The measured [CH2DOH]/[CH3OD] ratios are inconsistent with the current theory of methanol deuteration, independently of the mass of the source. While the large ratios measured in low- and intermediate-mass sources can be explained qualitatively by various selective depletion mechanisms, the small ratios (<2) measured toward massive hot cores are puzzling. A revision of the deuterium chemistry in hot cores is suggested.

Abstract Copyright:

Journal keyword(s): molecular processes - stars: protostars - ISM: molecules

Simbad objects: 12

goto Full paper

goto View the reference in ADS

Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 W 3(H2O) Mas 02 27 04.6 +61 52 25           ~ 126 0
2 IRAS 03258+3104 Y*O 03 28 55.30 +31 14 27.8           ~ 160 1
3 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 408 3
4 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 627 1
5 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 470 0
6 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 568 0
7 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 591 1
8 V* V2457 Ori Or* 05 35 26.97000 -05 09 54.4644         18.858 ~ 125 0
9 OMC 2 MoC 05 35 27 -05 10.1           ~ 404 1
10 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1087 1
11 [FCC2002] A1 Y*O 18 36 12.6 -07 12 11           ~ 29 0
12 NAME Cep E HII 23 03 12.779 +61 42 25.75           ~ 159 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2011A&A...528L..13R and select 'bookmark this link' or equivalent in the popup menu


2021.04.19-15:35:59

© Université de Strasbourg/CNRS

    • Contact