2018A&A...617A..28S


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.29CEST22:19:39

2018A&A...617A..28S - Astronomy and Astrophysics, volume 617A, 28-28 (2018/9-1)

Chemistry in disks. XI. Sulfur-bearing species as tracers of protoplanetary disk physics and chemistry: the DM Tau case.

SEMENOV D., FAVRE C., FEDELE D., GUILLOTEAU S., TEAGUE R., HENNING T., DUTREY A., CHAPILLON E., HERSANT F. and PIETU V.

Abstract (from CDS):


Context. Several sulfur-bearing molecules are observed in the interstellar medium and in comets, in strong contrast to protoplanetary disks where only CS, H2CS, and SO have been detected so far.
Aims. We combine observations and chemical models to constrain the sulfur abundances and their sensitivity to physical and chemical conditions in the DM Tau protoplanetary disk.
Methods. We obtained 0.5'' Atacama Large Millimeter Array observations of DM Tau in Bands 4 and 6 in lines of CS, SO, SO2, OCS, CCS, H2CS, and H2S, achieving a ∼5mJy sensitivity. Using the non-Local Thermodynamical Equilibrium radiative transfer code RADEX and the forward-modeling tool DiskFit, disk-averaged CS column densities and upper limits for the other species were derived.
Results. Only CS was detected with a derived column density of ∼2-6x1012cm–2. We report a first tentative detection of SO2 in DM Tau. The upper limits range between ∼1011 and 1014cm–2 for the other S-bearing species. The best-fit chemical model matching these values requires a gas-phase C/O ratio of ≥1 at r≥50-100au. With chemical modeling we demonstrate that sulfur-bearing species could be robust tracers of the gas-phase C/O ratio, surface reaction rates, grain size and UV intensities.
Conclusions. The lack of detections of a variety of sulfur-bearing molecules in DM Tau other than CS implies a dearth of reactive sulfur in the gas phase, either through efficient freeze-out or because most of the elemental sulfur is in other large species, as found in comets. The inferred high CS/SO and CS/SO2 ratios require a non-solar C/O gas-phase ratio of ≥1, consistent with the recent observations of hydrocarbon rings in DM Tau. The stronger depletion of oxygen-bearing S-species compared to CS is likely linked to the low observed abundances of gaseous water in DM Tau and points to a removal mechanism of oxygen from the gas.

Abstract Copyright: © ESO 2018

Journal keyword(s): astrochemistry - protoplanetary disks - radio lines: planetary systems - radio lines: stars - circumstellar matter

Status at CDS:  

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 QSO B0420-0127 QSO 04 23 15.80072776 -01 20 33.0654034   17.50 17.00 16.28   ~ 1033 3
2 NAME Tau-Aur Region SFR 04 30 +25.0           ~ 1197 1
3 PKS 0428+205 rG 04 31 03.76136151 +20 37 34.2649550   22.174   19.085   ~ 164 1
4 V* DM Tau TT* 04 33 48.7335659850 +18 10 09.974471722 14.30 14.82 14.00     M2Ve 496 0
5 EM* LkCa 15 TT* 04 39 17.7912813350 +22 21 03.387667491   13.01 12.03 11.61   K5:Ve 540 1
6 LDN 1527 DNe 04 39 53 +25 45.0           ~ 482 0
7 V* GO Tau TT* 04 43 03.0761884276 +25 20 18.708294279   16.2 14.40     M2.3 146 0
8 V* GM Aur TT* 04 55 10.9813656049 +30 21 59.375978047 14.59 14.22 13.10     K3Ve 543 0
9 V* AB Aur Ae* 04 55 45.8459978418 +30 33 04.293281305 7.20 7.16 7.05 6.96 6.70 A0Ve 916 2
10 HD 31648 Ae* 04 58 46.2654165113 +29 50 36.990341242 7.84 7.78 7.62 7.76 7.43 A5Vep 384 0
11 QSO B0507+179 QSO 05 10 02.36912982 +18 00 41.5816534   20.0 19.0 19.09   ~ 293 1
12 HH 212 HH 05 43 51.41 -01 02 53.1           ~ 266 1
13 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1491 1
14 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 636 1

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2020.03.29-22:19:39

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