Studying geometry of the ultraluminous X-ray pulsar Swift J0243.6+6124 using X-ray and optical polarimetry - INSU - Institut national des sciences de l'Univers
Article Dans Une Revue Astronomy & Astrophysics - A&A Année : 2024

Studying geometry of the ultraluminous X-ray pulsar Swift J0243.6+6124 using X-ray and optical polarimetry

Juri Poutanen , Sergey S Tsygankov , Victor Doroshenko , Sofia V Forsblom , Peter Jenke , Philip Kaaret , Andrei V Berdyugin , Dmitry Blinov , Vadim Kravtsov , Ioannis Liodakis , Anastasia Tzouvanou , Alessandro Di Marco , Jeremy Heyl , Fabio La Monaca , Alexander A Mushtukov , George G Pavlov , Alexander Salganik , Alexandra Veledina , Martin C Weisskopf , Silvia Zane , Vladislav Loktev , Valery F Suleimanov , Colleen Wilson-Hodge , Svetlana V Berdyugina , Masato Kagitani , Vilppu Piirola , Takeshi Sakanoi , Iván Agudo , Lucio A Antonelli , Matteo Bachetti , Luca Baldini , Wayne H Baumgartner , Ronaldo Bellazzini , Stefano Bianchi , Stephen D Bongiorno , Raffaella Bonino , Alessandro Brez , Niccolò Bucciantini , Fiamma Capitanio , Simone Castellano , Elisabetta Cavazzuti , Chien-Ting Chen , Stefano Ciprini , Enrico Costa , Alessandra de Rosa , Ettore del Monte , Laura Di Gesu , Niccolò Di Lalla , Immacolata Donnarumma , Michal Dovčiak , Steven R Ehlert , Teruaki Enoto , Yuri Evangelista , Sergio Fabiani , Riccardo Ferrazzoli , Javier A Garcia , Shuichi Gunji , Kiyoshi Hayashida , Wataru Iwakiri , Svetlana G Jorstad , Vladimir Karas , Fabian Kislat , Takao Kitaguchi , Jeffery J Kolodziejczak , Luca Latronico , Simone Maldera , Alberto Manfreda , Frédéric Marin (1) , Andrea Marinucci , Alan P Marscher , Herman L Marshall , Francesco Massaro , Giorgio Matt , Ikuyuki Mitsuishi , Tsunefumi Mizuno , Fabio Muleri , Michela Negro , Chi-Yung Ng , Stephen L O’dell , Nicola Omodei , Chiara Oppedisano , Alessandro Papitto , Abel L Peirson , Matteo Perri , Melissa Pesce-Rollins , Pierre-Olivier Petrucci (2) , Maura Pilia , Andrea Possenti , Simonetta Puccetti , Brian D Ramsey , John Rankin , Ajay Ratheesh , Oliver J Roberts , Roger W Romani , Carmelo Sgrò , Patrick Slane , Paolo Soffitta , Gloria Spandre , Douglas A Swartz , Toru Tamagawa , Fabrizio Tavecchio , Roberto Taverna , Yuzuru Tawara , Allyn F Tennant , Nicholas E Thomas , Francesco Tombesi , Alessio Trois , Roberto Turolla , Jacco Vink , Kinwah Wu , Fei Xie
Juri Poutanen
Sergey S Tsygankov
Victor Doroshenko
Sofia V Forsblom
Peter Jenke
Philip Kaaret
Andrei V Berdyugin
Dmitry Blinov
Vadim Kravtsov
Ioannis Liodakis
Anastasia Tzouvanou
Alessandro Di Marco
Jeremy Heyl
Fabio La Monaca
Alexander A Mushtukov
George G Pavlov
Alexander Salganik
Alexandra Veledina
Martin C Weisskopf
Silvia Zane
Vladislav Loktev
Valery F Suleimanov
Colleen Wilson-Hodge
Svetlana V Berdyugina
Masato Kagitani
Vilppu Piirola
Takeshi Sakanoi
Iván Agudo
Lucio A Antonelli
Matteo Bachetti
Luca Baldini
Wayne H Baumgartner
Ronaldo Bellazzini
Stefano Bianchi
Stephen D Bongiorno
Raffaella Bonino
Alessandro Brez
Niccolò Bucciantini
Fiamma Capitanio
Simone Castellano
Elisabetta Cavazzuti
Chien-Ting Chen
Stefano Ciprini
Enrico Costa
Alessandra de Rosa
Ettore del Monte
Laura Di Gesu
Niccolò Di Lalla
Immacolata Donnarumma
Michal Dovčiak
Steven R Ehlert
Teruaki Enoto
Yuri Evangelista
Sergio Fabiani
Riccardo Ferrazzoli
Javier A Garcia
Shuichi Gunji
Kiyoshi Hayashida
  • Fonction : Auteur
Wataru Iwakiri
Svetlana G Jorstad
Vladimir Karas
Fabian Kislat
Takao Kitaguchi
  • Fonction : Auteur
Jeffery J Kolodziejczak
Luca Latronico
Simone Maldera
Alberto Manfreda
Frédéric Marin
Observatoire astronomique de Strasbourg
Andrea Marinucci
Alan P Marscher
Herman L Marshall
Francesco Massaro
Giorgio Matt
Ikuyuki Mitsuishi
  • Fonction : Auteur
Tsunefumi Mizuno
Fabio Muleri
Michela Negro
Chi-Yung Ng
Stephen L O’dell
Nicola Omodei
Chiara Oppedisano
Alessandro Papitto
Abel L Peirson
Matteo Perri
Melissa Pesce-Rollins
Pierre-Olivier Petrucci
Institut de Planétologie et d'Astrophysique de Grenoble
Maura Pilia
Andrea Possenti
Simonetta Puccetti
Brian D Ramsey
John Rankin
Ajay Ratheesh
Oliver J Roberts
Roger W Romani
Carmelo Sgrò
Patrick Slane
Paolo Soffitta
Gloria Spandre
Douglas A Swartz
Toru Tamagawa
Fabrizio Tavecchio
Roberto Taverna
Yuzuru Tawara
  • Fonction : Auteur
Allyn F Tennant
Nicholas E Thomas
Francesco Tombesi
Alessio Trois
Roberto Turolla
Jacco Vink
Kinwah Wu
Fei Xie

Résumé

Discovery of pulsations from a number of ultra-luminous X-ray (ULX) sources proved that accretion onto neutron stars can produce luminosities exceeding the Eddington limit by several orders of magnitude. The conditions necessary to achieve such high luminosities as well as the exact geometry of the accretion flow in the neutron star vicinity are, however, a matter of debate. The pulse phase-resolved polarization measurements that became possible with the launch of the Imaging X-ray Polarimetry Explorer (IXPE) can be used to determine the pulsar geometry and its orientation relative to the orbital plane. They provide an avenue to test different theoretical models of ULX pulsars. In this paper we present the results of three IXPE observations of the first Galactic ULX pulsar Swift J0243.6+6124 during its 2023 outburst. We find strong variations in the polarization characteristics with the pulsar phase. The average polarization degree increases from about 5% to 15% as the flux dropped by a factor of three in the course of the outburst. The polarization angle (PA) as a function of the pulsar phase shows two peaks in the first two observations, but changes to a characteristic sawtooth pattern in the remaining data set. This is not consistent with a simple rotating vector model. Assuming the existence of an additional constant polarized component, we were able to fit the three observations with a common rotating vector model and obtain constraints on the pulsar geometry. In particular, we find the pulsar angular momentum inclination with respect to the line of sight of i p = 15°–40°, the magnetic obliquity of θ p = 60°–80°, and the pulsar spin position angle of χ p ≈ −50°, which significantly differs from the constant component PA of about 10°. Combining these X-ray measurements with the optical PA, we find evidence for at least a 30° misalignment between the pulsar angular momentum and the binary orbital axis.

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Planète et Univers [physics]
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https://insu.hal.science/insu-04777204

Soumis le : mardi 12 novembre 2024-10:59:23

Dernière modification le : lundi 9 décembre 2024-03:25:06

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insu-04777204 , version 1 (12-11-2024)

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Juri Poutanen, Sergey S Tsygankov, Victor Doroshenko, Sofia V Forsblom, Peter Jenke, et al.. Studying geometry of the ultraluminous X-ray pulsar Swift J0243.6+6124 using X-ray and optical polarimetry. Astronomy & Astrophysics - A&A, 2024, 691, pp.A123. ⟨10.1051/0004-6361/202450696⟩. ⟨insu-04777204⟩

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