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

Chapillon, E., Parise, Berengere, Guilloteau, S., Dutrey, A. and Wakelam, V. 2010. C I observations in the CQ Tauri proto-planetary disk: evidence of a very low gas-to-dust ratio? Astronomy and Astrophysics 520 , A61. 10.1051/0004-6361/201014841

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Abstract

Context. 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. Aims. 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. Methods. We used APEX to observe the two C i transitions 3P1 3P0 at 492 GHz and 3P2 3P1 at 809 GHz 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. Results. We did not detect the C i lines. However, our upper limits are deep enough to exclude high-C i models. The only available models compatible with our limits imply very low gas-to-dust ratios, of the order of only a few. Conclusions. These observations strengthen the hypothesis that CQ Tau is likely to be a transition disk and suggest that gas disappears before dust.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	circumstellar matter; protoplanetary disks; stars: individual: CQ Tau; radio lines: stars
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0004-6361/ (accessed 17/04/2014)
Publisher:	EDP Sciences
ISSN:	0004-6361
Date of First Compliant Deposit:	30 March 2016
Last Modified:	10 May 2023 20:36
URI:	https://orca.cardiff.ac.uk/id/eprint/52803

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