Stangret, M.M.StangretPallé, E.E.PalléCasasayas-Barris, N.N.Casasayas-BarrisOshagh, M.M.OshaghBello-Arufe, A.A.Bello-ArufeLuque, R.R.LuqueNASCIMBENI, VALERIOVALERIONASCIMBENIYan, F.F.YanOrell-Miquel, J.J.Orell-MiquelSICILIA, DanielaDanielaSICILIAMalavolta, L.L.MalavoltaAddison, B. C.B. C.AddisonBuchhave, L. A.L. A.BuchhaveBONOMO, ALDO STEFANOALDO STEFANOBONOMOBORSA, FrancescoFrancescoBORSACabot, S. H. C.S. H. C.CabotCecconi, M.M.CecconiFischer, D. A.D. A.FischerHarutyunyan, A.A.HarutyunyanMendonça, J. M.J. M.MendonçaNowak, G.G.NowakParviainen, H.H.ParviainenSOZZETTI, AlessandroAlessandroSOZZETTITronsgaard, R.R.Tronsgaard2022-05-312022-05-3120210004-6361http://hdl.handle.net/20.500.12386/32119Ultra-hot Jupiters are defined as giant planets with equilibrium temperatures larger than 2000 K. Most of them are found orbiting bright A-F type stars, making them extremely suitable objects to study their atmospheres using high-resolution spectroscopy. Recent studies show a variety of atoms and molecules detected in the atmospheres of this type of planets. Here we present our analysis of the newly discovered ultra-hot Jupiter TOI-1431 b/MASCARA-5 b, using two transit observations with the HARPS-N spectrograph and one transit observation with the EXPRES spectrograph. Analysis of the Rossiter-McLaughlin effect shows that the planet is in a polar orbit, with a projected obliquity λ = −155<SUB>−10</SUB><SUP>+20</SUP> degrees. Combining the nights and applying both cross-correlation methods and transmission spectroscopy, we find no evidences of Ca I, Fe I, Fe II, Mg I, Na I, V I, TiO, VO or Hα in the atmosphere of the planet. Our most likely explanation for the lack of atmospheric features is the large surface gravity of the planet.STAMPAenArticle10.1051/0004-6361/2020401002-s2.0-85117171101http://arxiv.org/abs/2104.12414v1https://www.aanda.org/articles/aa/full_html/2021/10/aa40100-20/aa40100-20.html2021A&A...654A..73SFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation