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Aims. We intend to spatially and spectrally resolve the [O I] emission regionin two nearby Herbig stars.  Methods. We present high-resolution (R = 80,000) VLT/UVES echelle spectra ofthe [O I] 6300A line in the Herbig Ae/Be stars HD 97048 and HD 100546. Apartfrom the spectral signature, also the spatial extent of the [O I] emissionregion is investigated. For both stars, we have obtained spectra with the slitpositioned at different position angles on the sky.  Results. The [O I] emission region of HD 100546 appears to be coinciding withthe dust disk, its major axis located at 150+/-11 degrees east of north. The SEpart of the disk moves towards the observer, while the NW side is redshifted.The [O I] emission region rotates counterclockwise around the central star. ForHD 97048, the position angle of the emission region is 160+/-19 degrees east ofnorth, which is the first determination of this angle in the literature. Thesouthern parts of the disk are blueshifted, the northern side moves away fromus. Our data support the idea that a gap is present at 10AU in the disk of HD100546. Such a gap is likely planet-induced. We estimate the mass and orbitalradius of this hypothetical companion responsible for this gap to be 20 Jupitermasses and 6.5 AU respectively.  Conclusions. Based on temporal changes in the [O I] line profile, we concludethat inhomogeneities are present in the [O I] emission region of HD 100546.These ``clumps'' could be in resonance with the suggested companion, orbitingthe central star in about 11 yr. If confirmed, these observations could pointto the existence of an object straddling the line between giant planet andbrown dwarf in a system as young as 10 million years.Comment: 13 pages, 8 figures. Accepted for publication in Astronomy &  Astrophysics (28/11/2005

Resolving the disk rotation of HD 97048 and HD 100546 in the [O I] 6300 Å line: evidence for a giant planet orbiting HD 100546