Query : 2010A&A...520A..61C

2010A&A...520A..61C - Astronomy and Astrophysics, volume 520, A61-61 (2010/9-2)

CI observations in the CQ Tauri proto-planetary disk: evidence of a very low gas-to-dust ratio ?


Abstract (from CDS):

The gas and dust dissipation processes of proto-planetary disks are hardly known. Transition disks between Class II (proto-planetary disks) and Class III (debris disks) remain difficult to detect. We investigate the carbon chemistry of the peculiar CQ Tau gas disk. It is likely to be a transition disk because it exhibits weak CO emission with a relatively strong millimeter continuum, indicating that the disk may currently be dissipating its gas content. We used APEX to observe the two CI transitions 3P1->3P0 at 492GHz and 3P2->3P1 at 809GHz in the disk orbiting CQ Tau. We compare the observations to several chemical model predictions. We focus our study on the influence of the stellar UV radiation shape and gas-to-dust ratio. We did not detect the CI lines. However, our upper limits are deep enough to exclude high-CI models. The only available models compatible with our limits imply very low gas-to-dust ratios, of the order of only a few. These observations strengthen the hypothesis that CQ Tau is likely to be a transition disk and suggest that gas disappears before dust.

Abstract Copyright:

Journal keyword(s): circumstellar matter - protoplanetary disks - stars: individual: CQ Tau - radio lines: stars

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 V* BP Tau Or* 04 19 15.8339827632 +29 06 26.926959492   13.13 12.12 11.89   K5/7Ve 632 0
2 HD 36112 Ae* 05 30 27.5285630040 +25 19 57.076288752   8.57 8.27     A8Ve 416 0
3 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 797 0
4 V* CQ Tau Ae* 05 35 58.4666264136 +24 44 54.091450572 11.290 10.780 10.000   8.33 F5IVe 283 0
5 HD 100546 Be* 11 33 25.4408872296 -70 11 41.241297948   6.71 6.30   6.64 A0VaekB8_lB 717 1

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