2011A&A...535A.104D


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET12:02:30

2011A&A...535A.104D - Astronomy and Astrophysics, volume 535A, 104-104 (2011/11-1)

Chemistry in disks. V. Sulfur-bearing molecules in the protoplanetary disks surrounding LkCa15, MWC 480, DM Tauri, and GO Tauri.

DUTREY A., WAKELAM V., BOEHLER Y., GUILLOTEAU S., HERSANT F., SEMENOV D., CHAPILLON E., HENNING T., PIETU V., LAUNHARDT R., GUETH F. and SCHREYER K.

Abstract (from CDS):

We study the content in S-bearing molecules of protoplanetary disks around low-mass stars. We used the new IRAM 30-m receiver EMIR to perform simultaneous observations of the 110-101 line of H2S at 168.8GHz and 223-112 line of SO at 99.3GHz. We compared the observational results with predictions coming from the astrochemical code NAUTILUS, which has been adapted to protoplanetary disks. The data were analyzed together with existing CS J=3-2 observations. We fail to detect the SO and H2S lines, although CS is detected in LkCa15, DMTau, and GOTau but not in MWC480. However, our new upper limits are significantly better than previous ones and allow us to put some interesting constraints on the sulfur chemistry. Our best modeling of disks is obtained for a C/O ratio of 1.2, starting from initial cloud conditions of H density of 2x105cm–3 and age of 106yr. The results agree with the CS data and are compatible with the SO upper limits, but fail to reproduce the H2S upper limits. The predicted H2S column densities are too high by at least one order of magnitude. H2S may remain locked onto grain surfaces and react with other species, thereby preventing the desorption of H2S.

Abstract Copyright:

Journal keyword(s): circumstellar matter - astrochemistry - protoplanetary disks - submillimeter: planetary systems - molecular processes

Simbad objects: 6

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Number of rows : 6

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 V* DM Tau Or* 04 33 48.7335659850 +18 10 09.974471722 14.30 14.82 14.00     M2Ve 524 0
2 EM* LkCa 15 Or* 04 39 17.7912813350 +22 21 03.387667491   13.01 12.03 11.61   K5:Ve 567 1
3 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1383 0
4 V* GO Tau Or* 04 43 03.0761884276 +25 20 18.708294279   16.2 14.40     M2.3 158 0
5 HD 31648 Ae* 04 58 46.2654165113 +29 50 36.990341242 7.84 7.78 7.62 7.76 7.43 A5Vep 404 0
6 NAME dze Oph Cloud Cld 16 37 09 -10 34.0           ~ 106 0

    Equat.    Gal    SGal    Ecl

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2020.12.02-12:02:30

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