A Resolved Circumstellar Disk around the Herbig Ae Star HD 100546 in the Thermal Infrared

  • Liu W
  • Hinz P
  • Meyer M
  • et al.
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Abstract

We present mid-infrared nulling interferometric and direct imaging observations of the Herbig Ae star HD 100546 obtained with the Magellan I (Baade) 6.5 m telescope. The observations show resolved circumstellar emission at 10.3, 11.7, 12.5, 18.0, and 24.5 microns. Through the nulling observations (10.3, 11.7 and 12.5 microns), we detect a circumstellar disk, with an inclination of 45 ± 15 degrees with respect to a face-on disk, a semimajor axis position angle of 150 ± 10 degrees (E of N), and a spatial extent of about 25 AU. The direct images (18.0 and 24.5 microns) show evidence for cooler dust with a spatial extent of 30-40 AU from the star. The direct images also show evidence for an inclined disk with a similar position angle as the disk detected by nulling. This morphology is consistent with models in which a flared circumstellar disk dominates the emission. However, the similarity in relative disk size we derive for different wavelengths suggests that the disk may have a large inner gap, possibly cleared out by the formation of a giant protoplanet. The existence of a protoplanet

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Liu, W. M., Hinz, P. M., Meyer, M. R., Mamajek, E. E., Hoffmann, W. F., & Hora, J. L. (2003). A Resolved Circumstellar Disk around the Herbig Ae Star HD 100546 in the Thermal Infrared. The Astrophysical Journal, 598(2), L111–L114. https://doi.org/10.1086/380827

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