While other astronomers detect unseen planets by their effect on the motion of their parent stars, ISO teams see favourable circumstances for planet-making.
Planets can form from the dust grains.
When the process is over, only a thin ring of debris remains. Although no telescope has been able so far to image any alien planet, ISO has detected many of these thin debris disks, which astronomers believe are made of small bodies like comets. A dust disk where ISO found olivine signature. The first proven connection between an alien planet and a thin debris disk came when Carsten Dominik, also at Leiden, found a debris disk surrounding a star where a planet had already been detected by other means. The star is Rho Cancri in the Cancer constellation, and a planet about the size of Jupiter is orbiting around it at a very close distance.