The question is: How do we detect said aliens? We can probably not use radio, because as some of you have touched, modern spread-spectrum communication is indistinguishable from noise. Add to this that we have this HUGE wide-band noise-generator right next to us called the sun. The radiation from alien suns is hard enough to block out at stellar distances in the visible regime, even harder at radio frequencies.
So how do we detect aliens? By the bulk. E.g. by looking at the atmospheric composition and saying "here are compounds that can not be produced by any natural method ".
So we will be checking against our models and trying to find deviations. Which leads me to my point:
Here we have a planet with the mass 17 times of earth, but with an atmosphere way of the chart of any predictions!
It is far out, even for me