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Molecular Gas in the Inner 1 AU of the TW Hya and GM Aur Transitional Disks

Salyk, C. and Blake, G. A. and Boogert, A. C. A. and Brown, J. M. (2007) Molecular Gas in the Inner 1 AU of the TW Hya and GM Aur Transitional Disks. Astrophysical Journal, 655 (2). L105-L108. ISSN 0004-637X. doi:10.1086/512012.

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We report the detection of CO rovibrational emission from the transitional disks around the T Tauri stars TW Hya and GM Aur. Transitional disks are characterized by significant mid- to far-infrared (IR) dust emission combined with a relative deficit in the near-IR, indicating the presence of an optically thick outer disk but a reduced surface density of small dust grains in the inner disk. Kinematic fits to the resolved CO emission lines demonstrate that they arise from within the tenuous inner disk. Excitation diagram analyses yield rotational temperatures also consistent with small emission radii as well as densities implying dynamically significant amounts of gas in the inner disk and a gas-to-small dust grain ratio in excess of that in dense clouds. Nevertheless, gas densities are not high enough to maintain current accretion rates for more than a few hundred years without replenishment, and transfer of gas from the outer to inner disk is therefore likely required.

Item Type:Article
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Salyk, C.0000-0003-3682-6632
Blake, G. A.0000-0003-0787-1610
Additional Information:© 2007 The American Astronomical Society. Received 2006 June 6; accepted 2006 December 20; published 2007 January 16. The authors thank Ken Hinkle for his assistance with the Phoenix observations. We also acknowledge support from the NASA Spitzer and Origins programs. Data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and NASA. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. This work also utilized the Gemini Observatory as part of program GS-2006A-C-10. Gemini is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership.
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Subject Keywords:planetary systems : protoplanetary disks; stars : pre-main-sequence
Issue or Number:2
Record Number:CaltechAUTHORS:20100113-082939196
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Official Citation:Molecular Gas in the Inner 1 AU of the TW Hya and GM Aur Transitional Disks C. Salyk, G. A. Blake, A. C. A. Boogert, and J. M. Brown 2007 ApJ 655 L105-L108 doi: 10.1086/512012
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17155
Deposited By: Tony Diaz
Deposited On:19 Jan 2010 20:15
Last Modified:08 Nov 2021 23:33

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