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Understanding the dynamics and kinematics of out-flowing atmospheres of hotand warm exoplanets is crucial to understanding the origins and evolutionaryhistory of the exoplanets near the evaporation desert. Recently, ground basedmeasurements of the meta-stable Helium atom's resonant absorption at 10830\AA~has become a powerful probe of the base environment which is driving theoutflow of exoplanet atmospheres. We report evidence for the He I 10830 \AA~inabsorption (equivalent width $\sim$ $0.012 \pm 0.002$ \AA) in the exosphere ofa warm Neptune orbiting the M-dwarf GJ 3470, during three transits using theHabitable Zone Planet Finder (HPF) near infrared spectrograph. This marks thefirst reported evidence for He I 10830 \AA\, atmospheric absorption for aplanet orbiting an M-dwarf. Our detected absorption is broad and itsblueshifted wing extends to -36 km/sec, the largest reported in the literatureto date. We modelled the state of Helium atoms in the exosphere of GJ3470bbased on assumptions on the UV and X-ray flux of GJ 3470, and found ourmeasurement of flux-weighted column density of meta-stable state Helium$(N_{He^2_3S} = 2.4 \times 10^{10} \mathrm{cm^{-2}})$, derived from our transitobservations, to be consistent with model, within its uncertainties. Themethodology developed here will be useful to study and constrain theatmospheric outflow models of other exoplanets like GJ 3470b which are near theedge of the evaporation desert.

Evidence for He I 10830 \AA~ absorption during the transit of a warm Neptune around the M-dwarf GJ 3470 with the Habitable-zone Planet Finder