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Bright localized near-infrared emission at 1-4 AU in the AB Aurigae disk revealed by IOTA closure phases

Millan-Gabet, R. and Monnier, J. D. and Berger, J.-P. and Traub, W. A. and Schloerb, F. P. and Pedretti, E. and Benisty, M. and Carleton, N. P. and Haguenauer, P. and Kern, P. and Labeye, P. and Lacasse, M. G. and Malbet, F. and Perraut, K. and Pearlman, M. and Thureau, N. (2006) Bright localized near-infrared emission at 1-4 AU in the AB Aurigae disk revealed by IOTA closure phases. Astrophysical Journal, 645 (1). L77-L80. ISSN 0004-637X. doi:10.1086/506153.

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We report on the detection of localized off-center emission at 1-4 AU in the circumstellar environment of the young stellar object AB Aurigae. We used closure-phase measurements in the near-infrared that were made at the long-baseline interferometer IOTA, the first obtained on a young stellar object using this technique. When probing sub-AU scales, all closure phases are close to zero degrees, as expected given the previously determined size of the AB Aurigae inner-dust disk. However, a clear closure-phase signal of -3.5d +/- 0.5d is detected on one triangle containing relatively short baselines, requiring a high degree of non-point symmetry from emission at larger (AU-sized) scales in the disk. We have not identified any alternative explanation for these closure-phase results, and we demonstrate that a "disk hot spot" model can fit our data. We speculate that such detected asymmetric near-infrared emission might arise as a result of localized viscous heating due to a gravitational instability in the AB Aurigae disk, or to the presence of a close stellar companion or accreting substellar object.

Item Type:Article
Related URLs:
URLURL TypeDescription
Millan-Gabet, R.0000-0003-0447-5866
Monnier, J. D.0000-0002-3380-3307
Berger, J.-P.0000-0001-5025-0428
Benisty, M.0000-0002-7695-7605
Lacasse, M. G.0000-0001-8627-9708
Additional Information:© 2006 The American Astronomical Society. Received 2006 May 1; accepted 2006 May 23; published 2006 June 28. The authors gratefully acknowledge support from SAO, NASA (for third telescope development and NNG05G1180G), the NSF (AST-0138303, AST-0352723, for work on imaging with IOTA), and the Jet Propulsion Laboratory (JPL awards 1236050 and 1248252). The IONIC-3 instrument has been developed by LAOG and LETI in the context of the IONIC collaboration (LAOG, IMEP, LETI). The IONIC project is funded by the CNRS (France) and CNES (France).
Subject Keywords:infrared: stars—instrumentation: interferometers— planetary systems: protoplanetary disks—stars: formation— stars: individual (AB Aurigae)—techniques: high angular resolution
Issue or Number:1
Record Number:CaltechAUTHORS:MILapjl06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5282
Deposited By: Lindsay Cleary
Deposited On:09 Oct 2006
Last Modified:08 Nov 2021 20:24

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