Spatially and spectrally resolved 10 µm emission in Herbig Ae/Be stars
Waters, L. B. F. M.; Dominik, C.; van Boekel, R.; de Koter, A.; Tielens, A. G. G. M.; Dullemond, C. P.
Netherlands, Germany, Belgium
Abstract
We present new mid-infrared spectroscopy of the emission from warm circumstellar dust grains in the Herbig Ae stars HD 100546, HD 97048 and HD 104237, with a spatial resolution of ≈0.9 arcsec. We find that the emission in the UIR bands at 8.6, 11.3 and (HD 97048 only) 12.7 μm is extended in the first two sources. The continuum emission is resolved in HD 97048 and possibly in HD 100546. HD 104237 is not spatially resolved in our observations. We find that the UIR emission in HD 100546 and HD 97048 is extended on a scale of (several) 100 AU, corresponding to the outer disk scale in flaring disk models. Small carbonaceous particles are the dominant source of opacity in the HD 97048 disk.
Based on observations obtained at the European Southern Observatory (ESO), La Silla, and on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the UK) and with the participation of ISAS and NASA.