Stars with debris disks and planets

Many authors have shown that this property appears to be independent on planetary masses and also on stellar age, but never studied possible correlations with stellar kinematics and metallicity. In this paper we show that the majority of known stars containing both, debris disks and planets, belong to the metal enriched Galactic thin-disk.

The few exceptions are stars that seem to be born in the star formation peak occurred in the thick-disk formation times (HD10700, HD20794 and HD40307), i.e., between 11 and 8Gyr. The dusty disk's mass of these three old stars measured at 70um is very small, in fact it is less than that of the Kuiper belt of our Solar system by several orders of magnitude. These values are not surprising as are within the values expected for the stellar disk evolution of these primitive stars.