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Aim: We aim to refine the orbital and physical parameters and determine thesky-projected planet orbital obliquity of five eccentric transiting planetarysystems: HAT-P-15, HAT-P-17, HAT-P-21, HAT-P-26, and HAT-P-29. Each of thesystems hosts a hot Jupiter, except for HAT-P-26 which hosts a Neptune-massplanet. Methods: We observed transit events of these planets with the HARPS-Nspectrograph, obtaining high-precision radial velocity measurements that allowus to measure the Rossiter-McLaughlin effect for each of the target systems. Weused these new HARPS-N spectra and archival data, including those from Gaia, tobetter characterise the stellar atmospheric parameters. The photometricparameters for four of the hot Jupiters were recalculated using 17 new transitlight curves, obtained with an array of medium-class telescopes, and data fromthe TESS space telescope. HATNet time-series photometric data were checked forthe signatures of rotation periods of the target stars and their spin axisinclination. Results: From the analysis of the Rossiter-McLaughlin effect, wederived a sky-projected obliquity of 13, -26.3, -0.7, -26 degree for HAT-P-15b,HAT-P-17b, HAT-P-21b and HAT-P-29b, respectively. Due to the quality of thedata, we were not able to well constrain the sky-projected obliquity forHAT-P-26b, although a prograde orbit is favoured. The stellar activity ofHAT-P-21 indicates a rotation period of 15.88 days, which allowed us todetermine its true misalignment angle (25 degree). Our new analysis of thephysical parameters of the five exoplanetary systems returned values compatiblewith those existing in the literature. Using TESS and the available transitlight curves, we reviewed the orbital ephemeris for the five systems andconfirmed that the HAT-P-26 system shows transit timing variations, which maytentatively be attributed to the presence of a third body.

astronomy and astrophysics

The GAPS Programme at TNG: XXXVI. Measurement of the Rossiter-McLaughlin  effect and revising the physical and orbital parameters of the HAT-P-15,  HAT-P-17, HAT-P-21, HAT-P-26, HAT-P-29 eccentric planetary systems