X-ray pulsar GRO J1008-57 as an orthogonal rotator

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dc.contributor.authorTsygankov Sergey S.
dc.contributor.authorDoroshenko Victor
dc.contributor.authorMushtukov Alexander A.
dc.contributor.authorPoutanen Juri
dc.contributor.authorDi Marco Alessandro
dc.contributor.authorHeyl Jeremy
dc.contributor.authorLa Monaca Fabio
dc.contributor.authorForsblom Sofia V.
dc.contributor.authorMalacaria Christian
dc.contributor.authorMarshall Herman L.
dc.contributor.authorSuleimanov Valery F.
dc.contributor.authorSvoboda Jiri
dc.contributor.authorTaverna Roberto
dc.contributor.authorUrsini Francesco
dc.contributor.authorAgudo Iván
dc.contributor.authorAntonelli Lucio A.
dc.contributor.authorBachetti Matteo
dc.contributor.authorBaldini Luca
dc.contributor.authorBaumgartner Wayne H.
dc.contributor.authorBellazzini Ronaldo
dc.contributor.authorBianchi Stefano
dc.contributor.authorBongiorno Stephen D.
dc.contributor.authorBonino Raffaella
dc.contributor.authorBrez Alessandro
dc.contributor.authorBucciantini Niccolò
dc.contributor.authorCapitanio Fiamma
dc.contributor.authorCastellano Simone
dc.contributor.authorCavazzuti Elisabetta
dc.contributor.authorChen Chien-Ting
dc.contributor.authorCiprini Stefano
dc.contributor.authorCosta Enrico
dc.contributor.authorDe Rosa Alessandra
dc.contributor.authorDel Monte Ettore
dc.contributor.authorDi Gesu Laura
dc.contributor.authorDi Lalla Niccolò
dc.contributor.authorDonnarumma Immacolata
dc.contributor.authorDovčiak Michal
dc.contributor.authorEhlert Steven R.
dc.contributor.authorEnoto Teruaki
dc.contributor.authorEvangelista Yuri
dc.contributor.authorFabiani Sergio
dc.contributor.authorFerrazzoli Riccardo
dc.contributor.authorGarcia Javier A.
dc.contributor.authorGunji Shuichi
dc.contributor.authorHayashida Kiyoshi
dc.contributor.authorIwakiri Wataru
dc.contributor.authorJorstad Svetlana G.
dc.contributor.authorKaaret Philip
dc.contributor.authorKaras Vladimir
dc.contributor.authorKislat Fabian
dc.contributor.authorKitaguchi Takao
dc.contributor.authorKolodziejczak Jeffery J.
dc.contributor.authorKrawczynski Henric
dc.contributor.authorLatronico Luca
dc.contributor.authorLiodakis Ioannis
dc.contributor.authorMaldera Simone
dc.contributor.authorManfreda Alberto
dc.contributor.authorMarin Frédéric
dc.contributor.authorMarinucci Andrea
dc.contributor.authorMarscher Alan P.
dc.contributor.authorMassaro Francesco
dc.contributor.authorMatt Giorgio
dc.contributor.authorMitsuishi Ikuyuki
dc.contributor.authorMizuno Tsunefumi
dc.contributor.authorMuleri Fabio
dc.contributor.authorNegro Michela
dc.contributor.authorNg Chi-Yung
dc.contributor.authorO’Dell Stephen L.
dc.contributor.authorOmodei Nicola
dc.contributor.authorOppedisano Chiara
dc.contributor.authorPapitto Alessandro
dc.contributor.authorPavlov George G.
dc.contributor.authorPeirson Abel L.
dc.contributor.authorPerri Matteo
dc.contributor.authorPesce-Rollins Melissa
dc.contributor.authorPetrucci Pierre-Olivier
dc.contributor.authorPilia Maura
dc.contributor.authorPossenti Andrea
dc.contributor.authorPuccetti Simonetta
dc.contributor.authorRamsey Brian D.
dc.contributor.authorRankin John
dc.contributor.authorRatheesh Ajay
dc.contributor.authorRoberts Oliver J.
dc.contributor.authorRomani Roger W.
dc.contributor.authorSgrò Carmelo
dc.contributor.authorSlane Patrick
dc.contributor.authorSoffitta Paolo
dc.contributor.authorSpandre Gloria
dc.contributor.authorSwartz Douglas A.
dc.contributor.authorTamagawa Toru
dc.contributor.authorTavecchio Fabrizio
dc.contributor.authorTawara Yuzuru
dc.contributor.authorTennant Allyn F.
dc.contributor.authorThomas Nicholas E.
dc.contributor.authorTombesi Francesco
dc.contributor.authorTrois Alessio
dc.contributor.authorTurolla Roberto
dc.contributor.authorVink Jacco
dc.contributor.authorWeisskopf Martin C.
dc.contributor.authorWu Kinwah
dc.contributor.authorXie Fei
dc.contributor.authorZane Silvia
dc.contributor.organizationfi=Suomen ESO-keskus|en=Finnish Centre for Astronomy with ESO|
dc.contributor.organizationfi=Tuorlan observatorio|en=Tuorla Observatory|
dc.contributor.organization-code1.2.246.10.2458963.20.54954054844
dc.contributor.organization-code1.2.246.10.2458963.20.90670098848
dc.converis.publication-id180575557
dc.converis.urlhttps://research.utu.fi/converis/portal/Publication/180575557
dc.date.accessioned2025-08-27T23:28:24Z
dc.date.available2025-08-27T23:28:24Z
dc.description.abstractX-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 & DEG;, which is in good agreement with the orbital inclination), the position angle (75 & DEG;) of the pulsar spin axis, and the magnetic obliquity (& SIM;74 & DEG;). 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.
dc.identifier.eissn1432-0746
dc.identifier.jour-issn0004-6361
dc.identifier.olddbid204026
dc.identifier.oldhandle10024/187053
dc.identifier.urihttps://www.utupub.fi/handle/11111/52086
dc.identifier.urlhttps://doi.org/10.1051/0004-6361/202346134
dc.identifier.urnURN:NBN:fi-fe2025082790310
dc.language.isoen
dc.okm.affiliatedauthorTsygankov, Sergey
dc.okm.affiliatedauthorPoutanen, Juri
dc.okm.affiliatedauthorForsblom, Sofia
dc.okm.affiliatedauthorLiodakis, Yannis
dc.okm.discipline115 Astronomy and space scienceen_GB
dc.okm.discipline115 Avaruustieteet ja tähtitiedefi_FI
dc.okm.internationalcopublicationinternational co-publication
dc.okm.internationalityInternational publication
dc.okm.typeA1 ScientificArticle
dc.publisherEDP SCIENCES S A
dc.publisher.countryFranceen_GB
dc.publisher.countryRanskafi_FI
dc.publisher.country-codeFR
dc.relation.articlenumberA48
dc.relation.doi10.1051/0004-6361/202346134
dc.relation.ispartofjournalAstronomy and Astrophysics
dc.relation.volume675
dc.source.identifierhttps://www.utupub.fi/handle/10024/187053
dc.titleX-ray pulsar GRO J1008-57 as an orthogonal rotator
dc.year.issued2023

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