TY - JOUR
T1 - A resolved circumstellar disk around the Herbig Ae star HD 100546 in the thermal infrared
AU - Liu, Wilson M.
AU - Hinz, Philip M.
AU - Meyer, Michael R.
AU - Mamajek, Eric E.
AU - Hoffmann, William F.
AU - Hora, Joseph L.
N1 - Funding Information:
W. M. L. acknowledges support from the Michelson Graduate Fellowship. M. R. M. and E. E. M. acknowledge support through NASA contract 1224768 administered through JPL. E. E. M. also thanks the NASA Graduate Student Researchers Program (NGT5-50400) for support. The authors thank the staff of Las Campanas Observatory and the Magellan Project for wonderful support. BLINC was developed under a NASA/JPL grant for TPF. MIRAC is supported by grant AST 96-18850 from the NSF with additional support from SAO.
PY - 2003/12/1
Y1 - 2003/12/1
N2 - 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.
AB - 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.
KW - Stars: individual (HD 100546)
KW - Stars: pre-main-sequence
KW - Techniques: interferometric
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U2 - 10.1086/380827
DO - 10.1086/380827
M3 - Article
AN - SCOPUS:0348230658
VL - 598
SP - L111-L114
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2 II
ER -