Stellar content, planetary nebulae, and globular clusters of [KKS2000]04
  (NGC1052-DF2)
  [KKS2000]04 (NGC1052-DF2) has become a controversial and well-studied galaxy
after the claims suggesting a lack of dark matter and the presence of an
anomalously bright globular cluster (GC) system around it. A precise
determination of its overall star formation history (SFH) as well as a better
characterisation of its GC or planetary nebulae (PN) systems are crucial
aspects to: i) understand its real nature, in particular placing it within the
family of ultra diffuse galaxies; ii) shed light on its possible formation,
evolution, and survival in the absence of dark matter. With this purpose we
expand on the knowledge of [KKS2000]04 from the analysis of OSIRIS@GTC
spectroscopic data. On the one hand, we claim the possible detection of two new
PNe and confirm membership of 5 GCs. On the other hand, we find that the stars
shaping [KKS2000]04 are intermediate-age to old (90\% of its stellar mass older
than 5 Gyr, average age of 8.7 $\pm$ 0.7 Gyr) and metal-poor ([M/H] $\sim$
-1.18 $\pm$ 0.05), in general agreement with previous results. We do not find
any clear hints of significant changes in its stellar content with radius. In
addition, the possibility of [KKS2000]04 being a tidal dwarf galaxy with no
dark matter is highly disfavoured.
