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Understanding where and when the mass of stars is determined is one of thefundamental, mostly unsolved, questions in astronomy. Here, we present thefirst results of GASTON, the Galactic Star Formation with NIKA2 large programmeon the IRAM 30m telescope, that aims to identify new populations oflow-brightness sources to tackle the question of stellar mass determinationacross all masses. In this paper, we focus on the high-mass star formation partof the project, for which we map a $\sim2$ deg$^2$ region of the Galactic planearound $l=24^\circ$ in both 1.2 mm and 2.0 mm continuum. Half-way through theproject, we reach a sensitivity of 3.7 mJy/beam at 1.2mm. Even though largerthan our target sensitivity of 2 mJy, the current sensitivity already allowsthe identification of a new population of cold, compact sources that remainedundetected in any (sub-)mm Galactic plane survey so far. In fact, about 25% ofthe $\sim 1600$ compact sources identified in the 1.2 mm GASTON image are newdetections. We present a preliminary analysis of the physical properties of theGASTON sources as a function of their evolutionary stage, arguing for apotential evolution of the mass distribution of these sources with time.

GASTON: Galactic Star Formation with NIKA2: A new population of cold massive sources discovered