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We determine the true and the projected obliquity of HAT-P-36 andWASP-11/HAT-P-10 systems, respectively, which are both composed of a relativelycool star and a hot-Jupiter planet. Thanks to the high-resolution spectrographHARPS-N, we observed the Rossiter-McLaughlin effect for both the systems byacquiring precise radial-velocity measurements during planetary transit events.We also present photometric observations comprising six light curves coveringfive transit events, obtained using three medium-class telescopes and thetelescope-defocussing technique. One transit of WASP-11/HAT-P-10 was followedsimultaneously from two observatories. The three transit light curves ofHAT-P-36b show anomalies that are attributable to starspot complexes on thesurface of the parent star, in agreement with the analysis of its spectra thatindicate a moderate activity. By analysing the complete HATNet data set ofHAT-P-36, we estimated the stellar rotation period by detecting a periodicphotometric modulation in the light curve caused by star spots, obtainingProt=15.3 days, which implies that the inclination of the stellar rotationalaxis with respect to the line of sight is 65 degree. We used the newspectroscopic and photometric data to revise the main physical parameters andmeasure the sky-projected misalignment angle of the two systems. We found\lambda=-14 degree for HAT-P-36 and \lambda=7 degree for WASP-11/HAT-P-10,indicating in both cases a good spin-orbit alignment. In the case of HAT-P-36,we also measured its real obliquity, which turned out to be 25 degrees.

astronomy and astrophysics

The GAPS Programme with HARPS-N at TNG VIII: Observations of the  Rossiter-McLaughlin effect and characterisation of the transiting planetary  systems HAT-P-36 and WASP-11/HAT-P-10