Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-25
Astrophys.J.635:1173-1181,2005
Astronomy and Astrophysics
Astrophysics
19 pages, 2 figures, to appear in the Astrophysical Journal
Scientific paper
10.1086/497436
We present observations of the T Tauri stars BP Tau, DG Tau, DI Tau, GM Aur, LkCa 15, RW Aur and V830 Tau, using long baseline infrared interferometry at K band (2.2 microns) from the Keck Interferometer. The target sources have a range of mass accretion rates and excess near-infrared emission. The interferometer is most sensitive to extended emission on characteristic size scales of 1 to 5 millarcseconds. All sources show evidence for resolved K band emission on these scales, although a few of the sources are marginally consistent with being unresolved. We calculate the infrared excess based on fitting stellar photosphere models to the optical photometry and estimate the physical size of the emission region using simple geometric models for the sources with a significant infrared excess. Assuming that the K band resolved emission traces the inner edge of the dust disk, we compare the measured characteristic sizes to predicted dust sublimation radii and find that the models require a range of dust sublimation temperatures and possibly optical depths within the inner rim to match the measured radii.
Akeson Rachel Lynn
Beichman Ch.
Beletic James
Boden Andrew F.
Calvet Nuria
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