---
res:
  bibo_abstract:
  - We report on Imaging X-ray polarimetry explorer (IXPE) observations of the Be-transient
    X-ray pulsar LS V +44 17/RX J0440.9+4431 made at two luminosity levels during
    the giant outburst in January–February 2023. Considering the observed spectral
    variability and changes in the pulse profiles, the source was likely caught in
    supercritical and subcritical states with significantly different emission-region
    geometry, associated with the presence of accretion columns and hot spots, respectively.
    We focus here on the pulse-phase-resolved polarimetric analysis and find that
    the observed dependencies of the polarization degree and polarization angle (PA)
    on the pulse phase are indeed drastically different for the two observations.
    The observed differences, if interpreted within the framework of the rotating
    vector model (RVM), imply dramatic variations in the spin axis inclination, the
    position angle, and the magnetic colatitude by tens of degrees within the space
    of just a few days. We suggest that the apparent changes in the observed PA phase
    dependence are predominantly related to the presence of an unpulsed polarized
    component in addition to the polarized radiation associated with the pulsar itself.
    We then show that the observed PA phase dependence in both observations can be
    explained with a single set of RVM parameters defining the pulsar’s geometry.
    We also suggest that the additional polarized component is likely produced by
    scattering of the pulsar radiation in the equatorial disk wind.@eng
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      foaf_name: Heyl, Jeremy
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      foaf_givenName: Sergey S.
      foaf_name: Tsygankov, Sergey S.
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      foaf_givenName: Ilaria
      foaf_name: Caiazzo, Ilaria
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      foaf_surname: Veledina
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      foaf_name: Weisskopf, Martin C.
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      foaf_name: Forsblom, Sofia V.
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      foaf_name: González-Caniulef, Denis
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      foaf_name: Mereminskiy, Ilya A.
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      foaf_name: Molkov, Sergey V.
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  bibo_doi: 10.1051/0004-6361/202347088
  bibo_volume: 677
  dct_date: 2023^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/0004-6361
  - http://id.crossref.org/issn/1432-0746
  dct_language: eng
  dct_publisher: EDP Sciences@
  dct_subject:
  - Space and Planetary Science
  - Astronomy and Astrophysics
  dct_title: Complex variations in X-ray polarization in the X-ray pulsar LS V +44
    17/RX J0440.9+4431@
...