2003ApJ...598L.111L -
Astrophys. J., 598, L111-L114 (2003/December-1)
A resolved circumstellar disk around the Herbig Ae star HD 100546 in the thermal infrared.
LIU W.M., HINZ P.M., MEYER M.R., MAMAJEK E.E., HOFFMANN W.F. and HORA J.L.
Abstract (from CDS):
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 µm. Through the nulling observations (10.3, 11.7, and 12.5 µm), we detect a circumstellar disk, with an inclination of 45°±15° with respect to a face-on disk, a semimajor axis position angle of 150°±10° (east of north), and a spatial extent of about 25 AU. The direct images (18.0 and 24.5 µm) 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 that 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 in the system also provides a natural explanation for the observed difference between HD 100546 and other Herbig Ae stars.
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Journal keyword(s):
Stars: Individual: Henry Draper Number: HD 100546 - Stars: Pre-Main-Sequence - Techniques: Interferometric
Simbad objects:
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