Bright Localized Near-Infrared Emission at 1-4 AU in the AB Aurigae Disk Revealed by IOTA Closure Phases | Zendy

R. MillanGabet | Zendy; John D. Monnier | Zendy; Jean-Philippe Berger | Zendy; Wesley A. Traub | Zendy; F. Peter Schloerb | Zendy; E. Pedretti | Zendy; M. Benisty | Zendy; N. P. Carleton | Zendy; Pierre Haguenauer | Zendy; P. Kern | Zendy; P. Labeye | Zendy; M. G. Lacasse | Zendy; F. Malbet | Zendy; K. Perraut | Zendy; M. R. Pearlman | Zendy; N. Thureau | Zendy

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Bright Localized Near-Infrared Emission at 1-4 AU in the AB Aurigae Disk Revealed by IOTA Closure Phases

Author(s) -

R. MillanGabet,

John D. Monnier,

Jean-Philippe Berger,

Wesley A. Traub,

F. Peter Schloerb,

E. Pedretti,

M. Benisty,

N. P. Carleton,

Pierre Haguenauer,

P. Kern,

P. Labeye,

M. G. Lacasse,

F. Malbet,

K. Perraut,

M. R. Pearlman,

N. Thureau

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/506153

Subject(s) - physics , astrophysics , infrared , young stellar object , gravitational instability , interferometry , infrared excess , astronomy , stars , star formation , galaxy

We report on the detection of localized off-center emission at 1-4 AU in thecircumstellar environment of the young stellar object AB Aurigae. We usedclosure phase measurements in the near-infrared made at the long baselineinterferometer IOTA, the first obtained on a young stellar object using thistechnique. When probing sub-AU scales, all closure phases are close to zerodegrees, as expected given the previously-determined size of the AB Aurigaeinner dust disk. However, a clear closure phase signal of -3.5 +/- 0.5 degreesis detected on one triangle containing relatively short baselines, requiring ahigh degree of non-point symmetry from emission at larger (AU-sized) scales inthe disk. We have not identified any alternative explanation for these closurephase results and demonstrate that a ``disk hot spot'' model can fit our data.We speculate that such asymmetric near-infrared emission detected might ariseas a result of localized viscous heating due to a gravitational instability inthe AB Aurigae disk, or to the presence of a close stellar companion oraccreting sub-stellar object.Comment: Accepted by Astrophysical Journal Letter

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