Radial structure in the TW Hya circumstellar disk

Akeson, R. L. and Millan-Gabet, R. and Ciardi, D. R. and Boden, A. F. and Sargent, A. I. and Monnier, J. D. and McAlister, H. and ten Brummelaar, T. and Sturmann, J. and Sturmann, L. and Turner, N. (2011) Radial structure in the TW Hya circumstellar disk. The Astrophysical Journal, 728 (2). pp. 96-105. ISSN 0004-637X

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Abstract

We present new near-infrared interferometric data from the CHARA array and the Keck Interferometer on the circumstellar disk of the young star, TW Hya, a proposed 'transition disk'. We use these data, as well as previously published, spatially resolved data at 10 μm and 7 mm, to constrain disk models based on a standard flared disk structure. We find that we can match the interferometry data sets and the overall spectral energy distribution with a three-component model, which combines elements at spatial scales proposed by previous studies: optically thin, emission nearest the star, an inner optically thick ring of emission at roughly 0.5 AU followed by an opacity gap and, finally, an outer optically thick disk starting at ∼4 AU. The model demonstrates that the constraints imposed by the spatially resolved data can be met with a physically plausible disk but this requires a disk containing not only an inner gap in the optically thick disk as previously suggested, but also a gap between the inner and outer optically thick disks. Our model is consistent with the suggestion by Calvet et al. of a planet with an orbital radius of a few AU. We discuss the implications of an opacity gap within the optically thick disk.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 09 Jun 2017 04:51
Last Modified: 27 Jun 2017 04:47
Uncontrolled Keywords: Circumstellar matter; Stars; W Hya
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1088/0004-637X/728/2/96
URI: http://eprints.usq.edu.au/id/eprint/32175

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