Radial Structure in the TW Hya Circumstellar Disk

Details Radial Structure in the TW Hya Circumstellar Disk Radial Structure in the TW Hya Circumstellar Disk

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...728...96a&link_type=abstract

The Astrophysical Journal, Volume 728, Issue 2, article id. 96 (2011).

Astronomy and Astrophysics

Astronomy

11

Circumstellar Matter, Stars: Individual: Tw Hya

Scientific paper

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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