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Leinert Ch., Van Boekel Roy, Waters L. B. F. M., Chesneau Olivier, Malbet Fabien, Köhler Rainer, Jaffe Walter J., Ratzka Thorsten, Dutrey Anne, Preibisch Th., Graser U., Bakker E., Chagnon Gilles, Cotton William D., Dominik Carsten, Dullemond C. P., Glazenborg-Kluttig Annelie W., Glindemann Andreas, Henning Thomas, Hofmann K.-H., De Jong Jeroen A., Lenzen Rainer, Ligori Sebastiano, Lopez Bruno, Meisner Jeffrey A., Morel Sébastien, Paresce Francesco, Pel J.-W., Percheron Isabelle, Perrin Guy, Przygodda Frank, Richichi Andrea, Schoeller Markus, Schuller Peter A., Stecklum Bringfried, Van den Ancker M. E., Von der Lühe O., Weigelt Gerd

Mid-infrared sizes of circumstellar disks around Herbig Ae/Be stars measured with MIDI on the VLTI

Astronomy and Astrophysics, 2004, vol. 423, pp. 537-548

Référence ADS : 2004A&A...423..537L

Résumé :

We present the first long baseline mid-infrared interferometric observations of the circumstellar disks surrounding Herbig Ae/Be stars. The observations were obtained using the mid-infrared interferometric instrument MIDI at the European Southern Observatory (ESO) Very Large Telescope Interferometer VLTI on Cerro Paranal. The 102 m baseline given by the telescopes UT1 and UT3 was employed, which provides a maximum full spatial resolution of 20 milli-arcsec (mas) at a wavelength of 10 mum. The interferometric signal was spectrally dispersed at a resolution of 30, giving spectrally resolved visibility information from 8 mum to 13.5 mum. We observed seven nearby Herbig Ae/Be stars and resolved all objects. The warm dust disk of HD 100546 could even be resolved in single-telescope imaging. Characteristic dimensions of the emitting regions at 10 mum are found to be from 1 AU to 10 AU. The 10 mum sizes of our sample stars correlate with the slope of the 10-25 mum infrared spectrum in the sense that the reddest objects are the largest ones. Such a correlation would be consistent with a different geometry in terms of flaring or flat (self-shadowed) disks for sources with strong or moderate mid-infrared excess, respectively. We compare the observed spectrally resolved visibilities with predictions based on existing models of passive centrally irradiated hydrostatic disks made to fit the SEDs of the observed stars. We find broad qualitative agreement of the spectral shape of visibilities corresponding to these models with our observations. Quantitatively, there are discrepancies that show the need for a next step in modelling of circumstellar disks, satisfying both the spatial constraints such as are now available from the MIDI observations and the flux constraints from the SEDs in a consistent way.

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