Detection of the White Dwarf Spin of the Long-orbital Period Magnetic Cataclysmic Variable V1082 Sgr
Abstract We report on the discovery of circular polarization modulated with a period of 1.943 ± 0.002 hr in the cataclysmic variable V1082 Sgr. These findings unambiguously reveal the rotation of a magnetic white dwarf and establish its intermediate polar nature. Along with its extraordinary long orbital period ( P orb ) of 20.8 hr, the spin period ( P spin ) places this system in an extreme position of the P spin versus P orb distribution. The circular polarization phase diagram has a single peak and an amplitude smaller than 1%. These data were used to model the postshock region of the accretion flow on the white dwarf surface using the CYCLOPS code. We obtained a magnetic field in the white dwarf pole of 11 MG and a magnetospheric radius consistent with the coupling region at around 2–3 white dwarf radii. The P spin / P orb value and the estimated magnetic field momentum suggest that V1082 Sgr could be out of spin equilibrium or in a spin-up state, possibly in a stream accretion mode.
Authors
- C. V. Rodrigues (ORCID: https://orcid.org/0000-0002-9459-043X)
- G. J. M. Luna (ORCID: https://orcid.org/0000-0002-2647-4373)
- K. M. G. Silva (ORCID: https://orcid.org/0000-0003-1949-4621)
- Wagner Schlindwein (ORCID: https://orcid.org/0000-0002-7095-4147)
- G. Tovmassian (ORCID: https://orcid.org/0000-0002-2953-7528)
- Ana Carolina Mattiuci
- I. J. Lima (ORCID: https://orcid.org/0000-0001-6013-1772)
- D. A. H. Buckley (ORCID: https://orcid.org/0000-0002-7004-9956)
- M. S. Palhares (ORCID: https://orcid.org/0000-0002-0396-8725)
- A. S. Oliveira (ORCID: https://orcid.org/0000-0001-6422-9486)
- Diego Cavalcante de Souza (ORCID: https://orcid.org/0000-0001-9255-864X)
- F. Falkenberg (ORCID: https://orcid.org/0000-0002-8646-218X)
Publication Details
- Journal
- The Astrophysical Journal
- Published
- 2025-05-07
- DOI
- https://doi.org/10.3847/1538-4357/adc380
- Citations
- 4
- Primary Topic
- Astrophysical Phenomena and Observations
- Type
- article
- Field-Weighted Citation Impact
- 4.62
Funders
- Center for Hierarchical Manufacturing, National Science Foundation
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Conselho Nacional de Desenvolvimento Científico e Tecnológico