What is the closest candidate for Dark Matter currently? I've both fascinated and frustrated after learning about the existence of Dark Matter. 

Can we find evidence of Dark Matter within our Solar system? What is currently the closest candidate for Dark Matter?

And please let me know what are good online resources where I can stay up to date with information about this?
This arxiv post says if there is dark matter in the solar systems, its density should be below $\approx 1.4\cdot 10^{-20} \frac{g}{cm^3}$.

They tried to find the dark matter in the solar systems by measuring its possible gravitational effects.

Note, it is a negative result, i.e. they didn't find anything, but they are suspecting, if the dark matter density would be at least $\approx 1.4\cdot 10^{-20} \frac{g}{cm^3}$, they had found it.

There are various candidates what could it be, the currently considered most probable are the WIMPs (particles interacting only gravitationally and maybe weakly).