Aims. We present a survey of the ortho-H2D+ (1(1,0)-1(1,1)) line toward a sample of 10 starless cores and 6 protostellar cores, carried out at the Caltech Submillimeter Observatory. The high diagnostic power of this line is revealed for the study of the chemistry, and the evolutionary and dynamical status of low-mass dense cores.Methods. The derived ortho-H2D+ column densities (N(ortho-H2D+)) are compared with predictions from simple chemical models of centrally concentrated cloud cores.Results. The line is detected in 7 starless cores and in 4 protostellar cores. N(ortho-H2D+) ranges between 2 and 40 x 10(12) cm(-2) in starless cores and between 2 and 9 x 10(12) cm(-2) in protostellar cores. The brightest lines are detected toward the dens...
Aims.We use observations and models of molecular D/H ratios to probe the physical conditions and ch...
We report the detection of D2CO in a sample of starless dense cores, in which we previously measured...
We present a study of the chemistry toward 294 dense cores in 12 molecular clumps, using data obtain...
Aims. We present a survey of the ortho-H2D+ (1(1,0)-1(1,1)) line toward a sample of 10 starless core...
International audienceAims. We present a survey of the ortho-H2D+ (1{1,0}-1{1,1}) line toward a samp...
29 pages, 6 figures.International audienceWe present a survey of the ortho-H2D+(1_{1,0}-1_{1,1}) lin...
Aims. We present a survey of the ortho-${\rm H}_{2}{\rm D}^{+}$ (1$_{1,0}$-1$_{1,1}$) line toward a...
Aims. We present a survey of the ortho–H2D+(11,0–11,1) line toward a sample of 10 starless cores and...
Prestellar cores are unique laboratories for studying the chemical and physical conditions preceding...
International audiencePrestellar cores are unique laboratories for studying the chemical and physica...
Context. Initial conditions and very early stages of star formation can be probed through spectrosco...
We have measured the deuterium fractionation (through the column density ratio N(N2D+)/N(N2H+)) and ...
We report on the detection of the ground-state rotational line of ortho-D2H+ at 1.477 THz (203 mu m)...
Context. The high degree of deuteration observed in some prestellar cores depends on the ortho-to-pa...
Context. The presence of H2D+ in dense cloud cores underlies ion-molecule reactions that strongly en...
Aims.We use observations and models of molecular D/H ratios to probe the physical conditions and ch...
We report the detection of D2CO in a sample of starless dense cores, in which we previously measured...
We present a study of the chemistry toward 294 dense cores in 12 molecular clumps, using data obtain...
Aims. We present a survey of the ortho-H2D+ (1(1,0)-1(1,1)) line toward a sample of 10 starless core...
International audienceAims. We present a survey of the ortho-H2D+ (1{1,0}-1{1,1}) line toward a samp...
29 pages, 6 figures.International audienceWe present a survey of the ortho-H2D+(1_{1,0}-1_{1,1}) lin...
Aims. We present a survey of the ortho-${\rm H}_{2}{\rm D}^{+}$ (1$_{1,0}$-1$_{1,1}$) line toward a...
Aims. We present a survey of the ortho–H2D+(11,0–11,1) line toward a sample of 10 starless cores and...
Prestellar cores are unique laboratories for studying the chemical and physical conditions preceding...
International audiencePrestellar cores are unique laboratories for studying the chemical and physica...
Context. Initial conditions and very early stages of star formation can be probed through spectrosco...
We have measured the deuterium fractionation (through the column density ratio N(N2D+)/N(N2H+)) and ...
We report on the detection of the ground-state rotational line of ortho-D2H+ at 1.477 THz (203 mu m)...
Context. The high degree of deuteration observed in some prestellar cores depends on the ortho-to-pa...
Context. The presence of H2D+ in dense cloud cores underlies ion-molecule reactions that strongly en...
Aims.We use observations and models of molecular D/H ratios to probe the physical conditions and ch...
We report the detection of D2CO in a sample of starless dense cores, in which we previously measured...
We present a study of the chemistry toward 294 dense cores in 12 molecular clumps, using data obtain...