Hyades white dwarfs - evidence for planetary system around LP 475-242?

The Hyades Cluster: Identification of a Planetary System and Escaping White Dwarfs
http://arxiv.org/abs/1304.2638

Calcium detected in the photosphere of LP 475-242, which may indicate that it has a planetary system.

This title seems something tricky just to catch attention.

Moreover it is not the first case of a white dwarf whose spectrum could hint there is planetary material or even some kind of planetary object somewhere orbiting the stellar remnant, though actually not detected.

Now with news release
http://www.space.com/21046-polluted-dead-stars-hubble-telescope.html

Main point seems to be to do with the cluster environment: still not many planets known in open clusters (or globulars for that matter).