Keles, E.E.KelesCzesla, S.S.CzeslaPoppenhaeger, K.K.PoppenhaegerHauschildt, P.P.HauschildtCarroll, T. A.T. A.CarrollIlyin, I.I.IlyinBaratella, M.M.BaratellaSteffen, M.M.SteffenStrassmeier, K. G.K. G.StrassmeierBONOMO, ALDO STEFANOALDO STEFANOBONOMOGaudi, B. S.B. S.GaudiHenning, T.T.HenningJohnson, M. C.M. C.JohnsonMolaverdikhani, K.K.MolaverdikhaniNASCIMBENI, VALERIOVALERIONASCIMBENIPatience, J.J.PatienceReiners, A.A.ReinersSCANDARIATO, GAETANOGAETANOSCANDARIATOSchlawin, E.E.SchlawinShkolnik, E.E.ShkolnikSICILIA, DanielaDanielaSICILIASOZZETTI, AlessandroAlessandroSOZZETTIMallonn, M.M.MallonnVeillet, C.C.VeilletWang, J.J.WangYan, F.F.Yan2024-09-232024-09-2320240035-8711http://hdl.handle.net/20.500.12386/35314Absorption lines from exoplanet atmospheres observed in transmission allow us to study atmospheric characteristics such as winds. We present a new high-resolution transit time-series of HD 189733b, acquired with the PEPSI instrument at the LBT and analyse the transmission spectrum around the Na D lines. We model the spectral signature of the RM-CL V -effect using synthetic PHOENIX spectra based on spherical LTE atmospheric models. We find an Na D absorption signature between the second and third contact but not during the ingress and egress phases, which casts doubt on the planetary origin of the signal. Presupposing a planetary origin of the signal, the results suggest a weak day-to-nightside streaming wind in the order of 0.7 km s-1 and a moderate super-rotational streaming wind in the order of 3-4 km s-1, challenging claims of pre v ailing strong winds on HD 189733b.STAMPAenArticle10.1093/mnras/stae10972-s2.0-85193045127https://academic.oup.com/mnras/article/530/4/4826/7658471https://api.elsevier.com/content/abstract/scopus_id/85193045127FIS/05 - ASTRONOMIA E ASTROFISICA