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The metastable helium triplet in the near-infrared (10833{\AA}) is among themost important probes of exoplanet atmospheres. It can trace their extendedouter layers and constrain mass-loss. We use the near-infrared high-resolutionspectropolarimeter SPIRou on the CFHT to search for the spectrally resolvedhelium triplet in the atmospheres of eleven exoplanets, ranging from warmmini-Neptunes to hot Jupiters and orbiting G, K, and M dwarfs. Observationswere obtained as part of the SPIRou Legacy Survey and complementary open-timeprograms. We apply a homogeneous data reduction to all datasets and setconstraints on the presence of metastable helium, despite the presence ofsystematics in the data. We confirm published detections for HAT-P-11b,HD189733b, and WASP-69b and set upper limits for the other planets. We applythe p-winds open source code to set upper limits on the mass-loss rate for thenon-detections and to constrain the thermosphere temperature, mass-loss rate,line-of-sight velocity, and the altitude of the thermosphere for thedetections. We confirm that the presence of metastable helium correlates withthe stellar mass and the XUV flux received by the planets. We investigated thecorrelation between the mass-loss rate and the presence of metastable helium,but it remains difficult to draw definitive conclusions. Finally, some of ourresults are in contradiction with previous results in the literature, thereforewe stress the importance of repeatable, homogeneous, and larger-scale analysesof the helium triplet to obtain robust statistics, study temporal variability,and better understand how the helium triplet can be used to explore theevolution of exoplanets.

Homogeneous search for helium in the atmosphere of 11 gas giant exoplanets with SPIRou