2003A&A...400L...1V


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET19:59:39

2003A&A...400L...1V - Astronomy and Astrophysics, volume 400, L1-4 (2003/3-2)

Detection of DCO+ in a circumstellar disk.

VAN DISHOECK E.F., THI W.-F. and VAN ZADELHOFF G.-J.

Abstract (from CDS):

We report the first detection of DCO+ in a circumstellar disk. The DCO+ J=5-4 line at 360.169GHz is observed with the 15m James Clerk Maxwell Telescope in the disk around the pre-main sequence star TW Hya. Together with measurements of the HCO+ and H13CO+ J=4-3 lines, this allows an accurate determination of the DCO+/HCO+ ratio in this disk. The inferred value of 0.035±0.015 is close to that found in cold pre-stellar cores and is somewhat higher than that measured in the envelope around the low-mass protostar IRAS 16293-2422. It is also close to the DCN/HCN ratio obtained for pristine cometary material in the jet of comet Hale-Bopp. The observed DCO+/HCO+ ratio for TW Hya is consistent with theoretical models of disks which consider gas-phase fractionation processes within a realistic 2-D temperature distribution and which include the effects of freeze-out onto grains.

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Journal keyword(s):

Simbad objects: 10

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Number of rows : 10

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 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 623 1
2 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 469 0
3 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 568 0
4 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1398 0
5 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 716 0
6 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 435 1
7 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1596 1
8 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 698 1
9 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1077 1
10 LDN 1689N DNe 16 32 25.96 -24 28 46.2           ~ 110 0

    Equat.    Gal    SGal    Ecl

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2021.03.01-19:59:39

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