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2005 December 20

Volume 635, Number 2
The Astrophysical Journal, 635:1173–1181, 2005 December 20
© 2005. The American Astronomical Society. All rights reserved. Printed in U.S.A.
DOI: 10.1086/497436

Keck Interferometer Observations of Classical and Weak-line T Tauri Stars

R. L. Akeson,1

A. F. Boden,1

J. D. Monnier,2

R. Millan-Gabet,1

C. Beichman,1

J. Beletic,3

N. Calvet,4

L. Hartmann,4

L. Hillenbrand,5

C. Koresko,1

A. Sargent,5 and

A. Tannirkulam2

ABSTRACT

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 μm) 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 1–5 mas. 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.

Received 2005 April 2; accepted 2005 August 25

Subject headings:

circumstellar matter—planetary systems: protoplanetary disks—stars: pre–main-sequence—techniques: high angular resolution

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  • 1Michelson Science Center, California Institute of Technology, MS 100-22, Pasadena, CA 91125.

  • 2University of Michigan, 941 Dennison Building, Ann Arbor, MI 48109.

  • 3W. M. Keck Observatory, California Association for Research in Astronomy, 65-1120 Mamalahoa Highway, Kamuela, HI 96743.

  • 4Smithsonian Astrophysical Observatory, MS 42, Cambridge, MA 02138.

  • 5Department of Astronomy, California Institute of Technology, MS 105-24, Pasadena, CA 91125.

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