All Tables

Table 1: Presentation of our target sample and their stellar parameters. The objects were selected either because of an existing planetary system or observational hints for a disk. See the column remarks for a classification of the targets (we do not distinguish between a single planet or a planetary system). Three resolved disks were also included. V-band fluxes are taken from SIMBAD and near-IR fluxes from the 2MASS catalogue. The distances are obtained either via the Extrasolar Planets Encyclopaedia (cf. footnote 1) or the cited papers. Where none of this was available the distance is estimated from Hipparcos parallaxes.
Table 2: Integration times and disk magnitude limits. The latter ones were determined with artificial disks of the sizes shown in this table. No disk was found down to the given surface brightness. The reduction routine has a lower performance for stars in clusters and a determination of brightness limits was sometimes not possible. These cases are indicated with "-''. Estimated errors for the given magnitudes are $\pm$ 0.2 mag. The disk brightness limit as a function of disk radius was studied in more detail for the targets HD 4208, HD 33636 and HD 217107 with further radii 1.0, 1.8, 2.5, 3.3, 4.0 and 4.8 $^{\prime \prime }$ (cf. Fig. 3). Disks with radii > 5.0 $^{\prime \prime }$ are too big for a detection with our software (since they would cover large parts of the detector, which makes them unphysical anyway). The S/N-ratio is the S/N per pixel and was calculated as described in Sect. 5.