A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Circular polarimetry of suspect wind-accreting magnetic pre-polars
Tekijät: Hakala Pasi, Parsons Steven G., Marsh Thomas R., Gansicke Boris T., Ramsay Gavin, Schwope Axel, Hermes J. J.
Kustantaja: OXFORD UNIV PRESS
Julkaisuvuosi: 2022
Journal: Monthly Notices of the Royal Astronomical Society
Lehden akronyymi: MON NOT R ASTRON SOC
Vuosikerta: 513
Numero: 3
Aloitussivu: 3858
Lopetussivu: 3870
Sivujen määrä: 13
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/stac1111
Verkko-osoite: https://academic.oup.com/mnras/article/513/3/3858/6573877
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/175454828
We present results from a circular polarimetric survey of candidate detached magnetic white dwarf - M dwarf binaries obtained using the Nordic Optical Telescope, La Palma. We obtained phase resolved spectropolarimetry and imaging polarimetry of seven systems, five of which show clearly variable circular polarisation. The data indicate that these targets have white dwarfs with magnetic field strengths >80 MG. Our study reveals that cyclotron emission can dominate the optical luminosity at wavelengths corresponding to the cyclotron emission harmonics, even in systems where the white dwarfs are only wind-accreting. This implies that a very significant fraction of the stellar wind of the companion star is captured by the magnetic white dwarf reducing the magnetic braking in pre-cataclysmic variables (CVs). Furthermore, the polarimetric confirmation of several detached, wind-accreting magnetic systems provides observational constraints on the models of magnetic CV evolution and white dwarf magnetic field generation. We also find that the white dwarf magnetic field configuration in at least two of these systems appears to be very complex.
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