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The study of exoplanetary atmospheres is key to understand the differencesbetween their physical, chemical and dynamical processes. Up to now, the bulkof atmospheric characterization analysis has been conducted on transitingplanets. On some sufficiently bright targets, high-resolution spectroscopy(HRS) has also been successfully tested for non-transiting planets. We studythe dayside of the non-transiting planet HD 102195b using the GIANOspectrograph mounted at TNG, demonstrating the feasibility of atmosphericcharacterization measurements and molecular detection for non-transitingplanets with the HRS technique using 4-m class telescopes. The Doppler-shiftedplanetary signal changes on the order of many km/s during the observations, incontrast with the telluric absorption which is stationary in wavelength,allowing us to remove the contamination from telluric lines while preservingthe features of the planetary spectrum. The emission signal from HD 102195b'satmosphere is then extracted by cross-correlating the residual spectra withatmospheric models. We detect molecular absorption from water vapor at4.4$\sigma$ level. We also find convincing evidence for the presence ofmethane, which is detected at the 4.1$\sigma$ level. The two molecules aredetected with a combined significance of 5.3$\sigma$, at a semi-amplitude ofthe planet radial velocity $K_P=128\pm 6$ km/s. We estimate a planet true massof $M_P=0.46\pm 0.03~M_J$ and orbital inclination between 72.5 and84.79$^{\circ}$ (1$\sigma$). Our analysis indicates a non-inverted atmospherefor HD 102195b, as expected given the relatively low temperature of the planet,inefficient to keep TiO/VO in gas phase. Moreover, a comparison withtheoretical expectations and chemical model predictions corroborates ourmethane detection and suggests that the detected $CH_4$ and $H_2O$ signaturescould be consistent with a low C/O ratio.

Exoplanet atmospheres with GIANO II. Detection of molecular absorption in the dayside spectrum of HD 102195b