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The next decade will see two large-scale space-based near-infrared surveys,Euclid and WFIRST. This paper shows that the subtle differences between thefilters proposed for these surveys and those from ground-based photometricsystems will produce a ground-space colour term that is dependent on waterabsorption in the spectra of astronomical objects. This colour term can be usedto identify free-floating planets in star forming regions, mimicking asuccessful ground-based technique that uses a filter sensitive to waterabsorption. This paper shows that this colour term is an effective discriminantbetween reddened background stars and ultracool dwarfs. This represents justone science justification for a Galactic Plane survey in the event of anextension to the Euclid mission beyond its original timeframe.

Detecting free-floating planets using water-depend colour terms in the next generation of infrared space-based surveys