Tsygankov, Sergey S.Sergey S.TsygankovDoroshenko, VictorVictorDoroshenkoMushtukov, Alexander A.Alexander A.MushtukovPoutanen, JuriJuriPoutanenDI MARCO, AlessandroAlessandroDI MARCOHeyl, JeremyJeremyHeylLA MONACA, FabioFabioLA MONACAForsblom, Sofia V.Sofia V.ForsblomMALACARIA, ChristianChristianMALACARIAMarshall, Herman L.Herman L.MarshallSuleimanov, Valery F.Valery F.SuleimanovXIE, FEIFEIXIEZane, SilviaSilviaZaneSvoboda, JiriJiriSvobodaTaverna, RobertoRobertoTavernaUrsini, FrancescoFrancescoUrsiniAgudo, IvánIvánAgudoANTONELLI, Lucio AngeloLucio AngeloANTONELLIBACHETTI, MatteoMatteoBACHETTIBaldini, LucaLucaBaldiniBaumgartner, Wayne H.Wayne H.BaumgartnerBellazzini, RonaldoRonaldoBellazziniBianchi, StefanoStefanoBianchiBongiorno, Stephen D.Stephen D.BongiornoBonino, RaffaellaRaffaellaBoninoBrez, AlessandroAlessandroBrezBUCCIANTINI, Niccolo'Niccolo'BUCCIANTINICAPITANIO, FIAMMAFIAMMACAPITANIOCastellano, SimoneSimoneCastellanoCavazzuti, ElisabettaElisabettaCavazzutiChen, Chien-TingChien-TingChenCiprini, StefanoStefanoCipriniCOSTA, ENRICOENRICOCOSTADE ROSA, AlessandraAlessandraDE ROSADEL MONTE, EttoreEttoreDEL MONTEDi Gesu, LauraLauraDi GesuDi Lalla, NiccolòNiccolòDi LallaDonnarumma, ImmacolataImmacolataDonnarummaDovčiak, MichalMichalDovčiakEhlert, Steven R.Steven R.EhlertEnoto, TeruakiTeruakiEnotoEVANGELISTA, YURIYURIEVANGELISTAFABIANI, SergioSergioFABIANIFERRAZZOLI, RiccardoRiccardoFERRAZZOLIGarcia, Javier A.Javier A.GarciaGunji, ShuichiShuichiGunjiHayashida, KiyoshiKiyoshiHayashidaIwakiri, WataruWataruIwakiriJorstad, Svetlana G.Svetlana G.JorstadKaaret, PhilipPhilipKaaretKaras, VladimirVladimirKarasKislat, FabianFabianKislatKitaguchi, TakaoTakaoKitaguchiKolodziejczak, Jeffery J.Jeffery J.KolodziejczakKrawczynski, HenricHenricKrawczynskiLatronico, LucaLucaLatronicoLiodakis, IoannisIoannisLiodakisMaldera, SimoneSimoneMalderaManfreda, AlbertoAlbertoManfredaMarin, FrédéricFrédéricMarinMarinucci, AndreaAndreaMarinucciMarscher, Alan P.Alan P.MarscherMASSARO, FRANCESCOFRANCESCOMASSAROMatt, GiorgioGiorgioMattMitsuishi, IkuyukiIkuyukiMitsuishiMizuno, TsunefumiTsunefumiMizunoMULERI, FABIOFABIOMULERINegro, MichelaMichelaNegroNg, Chi-YungChi-YungNgO'Dell, Stephen L.Stephen L.O'DellOmodei, NicolaNicolaOmodeiOppedisano, ChiaraChiaraOppedisanoPAPITTO, ALESSANDROALESSANDROPAPITTOPavlov, George G.George G.PavlovPeirson, Abel L.Abel L.PeirsonPERRI, MatteoMatteoPERRIPesce-Rollins, MelissaMelissaPesce-RollinsPetrucci, Pierre-OlivierPierre-OlivierPetrucciPILIA, MauraMauraPILIAPOSSENTI, ANDREAANDREAPOSSENTIPuccetti, SimonettaSimonettaPuccettiRamsey, Brian D.Brian D.RamseyRANKIN, JohnJohnRANKINRATHEESH, AJAYAJAYRATHEESHRoberts, Oliver J.Oliver J.RobertsRomani, Roger W.Roger W.RomaniSgrò, CarmeloCarmeloSgròSlane, PatrickPatrickSlaneSOFFITTA, PAOLOPAOLOSOFFITTASpandre, GloriaGloriaSpandreSwartz, Douglas A.Douglas A.SwartzTamagawa, ToruToruTamagawaTAVECCHIO, FabrizioFabrizioTAVECCHIOTawara, YuzuruYuzuruTawaraTennant, Allyn F.Allyn F.TennantThomas, Nicholas E.Nicholas E.ThomasTOMBESI, FrancescoFrancescoTOMBESITROIS, ALESSIOALESSIOTROISTurolla, RobertoRobertoTurollaVink, JaccoJaccoVinkWeisskopf, Martin C.Martin C.WeisskopfWu, KinwahKinwahWu2025-02-252025-02-2520230004-6361http://hdl.handle.net/20.500.12386/36204X-ray polarimetry is a unique way to probe the geometrical configuration of highly magnetized accreting neutron stars (X-ray pulsars). GRO J1008−57 is the first transient X-ray pulsar observed at two different flux levels by the Imaging X-ray Polarimetry Explorer (IXPE) during its outburst in November 2022. We find the polarization properties of GRO J1008−57 to be independent of its luminosity, with the polarization degree varying between nondetection and about 15% over the pulse phase. Fitting the phase-resolved spectro-polarimetric data with the rotating vector model allowed us to estimate the pulsar inclination (130°, which is in good agreement with the orbital inclination), the position angle (75°) of the pulsar spin axis, and the magnetic obliquity (∼74°). This makes GRO J1008−57 the first confidently identified nearly orthogonal rotator among X-ray pulsars. We discuss our results in the context of the neutron star atmosphere models and theories of the axis alignment of accreting pulsars.STAMPAenArticle10.1051/0004-6361/2023461342-s2.0-85164535605http://arxiv.org/abs/2302.06680v2https://www.aanda.org/articles/aa/full_html/2023/07/aa46134-23/aa46134-23.html2023A&A...675A..48TFIS/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