Detection of the White Dwarf Spin of the Long-orbital Period Magnetic Cataclysmic Variable V1082 Sgr
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 per...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/adc380 |
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| author | I. J. Lima G. Tovmassian C. V. Rodrigues A. S. Oliveira G. J. M. Luna D. A. H. Buckley K. M. G. Silva A. C. Mattiuci D. C. Souza W. Schlindwein F. Falkenberg M. S. Palhares |
| author_facet | I. J. Lima G. Tovmassian C. V. Rodrigues A. S. Oliveira G. J. M. Luna D. A. H. Buckley K. M. G. Silva A. C. Mattiuci D. C. Souza W. Schlindwein F. Falkenberg M. S. Palhares |
| author_sort | I. J. Lima |
| collection | DOAJ |
| description | 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. |
| format | Article |
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| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-dd4b78a76e0c489088aea0d4cecaf01e2025-08-20T02:16:06ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01984215210.3847/1538-4357/adc380Detection of the White Dwarf Spin of the Long-orbital Period Magnetic Cataclysmic Variable V1082 SgrI. J. Lima0https://orcid.org/0000-0001-6013-1772G. Tovmassian1https://orcid.org/0000-0002-2953-7528C. V. Rodrigues2https://orcid.org/0000-0002-9459-043XA. S. Oliveira3https://orcid.org/0000-0001-6422-9486G. J. M. Luna4https://orcid.org/0000-0002-2647-4373D. A. H. Buckley5https://orcid.org/0000-0002-7004-9956K. M. G. Silva6https://orcid.org/0000-0003-1949-4621A. C. Mattiuci7https://orcid.org/0000-0002-0337-1363D. C. Souza8https://orcid.org/0000-0001-9255-864XW. Schlindwein9https://orcid.org/0000-0002-7095-4147F. Falkenberg10https://orcid.org/0000-0002-8646-218XM. S. Palhares11https://orcid.org/0000-0002-0396-8725Universidade Estadual Paulista “Júlio de Mesquita Filho,” UNESP, Campus of Guaratinguetá, Av. Dr. Ariberto Pereira da Cunha, 333 - Pedregulho, Guaratinguetá - SP, 12516-410, Brazil; CONICET-Universidad de Buenos Aires , Instituto de Astronomía y Física del Espacio (IAFE), Av. Inte. Güiraldes 2620, C1428ZAA, Buenos Aires, Argentina; Universidad Nacional de San Juan , Facultad de Ciencias Exactas, Físicas y Naturales, Av. Ignacio de la Roza 590 (O), Complejo Universitario “Islas Malvinas,” Rivadavia, J5402DCS, San Juan, Argentina; Laboratório Nacional de Astrofísica (LNA) , Rua dos Estados Unidos 154, Bairro das Nações, Itajubá, 37504-364, MG, BrazilInstitute of Astronomy, Universidad Nacional Autonoma de Mexico , Ensenada, Baja California, Mexico; INAF—Osservatorio Astronomico di Brera , Via E. Bianchi 46, 23807 Merate (LC), ItalyInstituto Nacional de Pesquisas Espaciais (INPE/MCTI) , Av. dos Astronautas, 1758, São José dos Campos, SP, BrazilIP&D, Universidade do Vale do Paraíba , 12244-000, São José dos Campos, SP, BrazilUniversidad Nacional de Hurlingham (UNAHUR). Secretaría de Investigación , Av. Gdor. Vergara 2222, Villa Tesei, Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)South African Astronomical Observatory , PO Box 9, Observatory 7935, Cape Town, South Africa; Department of Physics, University of the Free State , PO Box 339, Bloemfontein 9300, South Africa; Department of Astronomy, University of Cape Town , Private Bag X3, Rondebosch 7701, South AfricaGemini Observatory/NSF’s NOIRLab , Casilla 603, La Serena, ChileInstituto Nacional de Pesquisas Espaciais (INPE/MCTI) , Av. dos Astronautas, 1758, São José dos Campos, SP, BrazilIP&D, Universidade do Vale do Paraíba , 12244-000, São José dos Campos, SP, BrazilInstituto Nacional de Pesquisas Espaciais (INPE/MCTI) , Av. dos Astronautas, 1758, São José dos Campos, SP, BrazilInstituto Nacional de Pesquisas Espaciais (INPE/MCTI) , Av. dos Astronautas, 1758, São José dos Campos, SP, BrazilIP&D, Universidade do Vale do Paraíba , 12244-000, São José dos Campos, SP, BrazilWe 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.https://doi.org/10.3847/1538-4357/adc380Close binary starsCataclysmic variable starsStarlight polarizationWhite dwarf starsStellar magnetic fieldsStellar accretion |
| spellingShingle | I. J. Lima G. Tovmassian C. V. Rodrigues A. S. Oliveira G. J. M. Luna D. A. H. Buckley K. M. G. Silva A. C. Mattiuci D. C. Souza W. Schlindwein F. Falkenberg M. S. Palhares Detection of the White Dwarf Spin of the Long-orbital Period Magnetic Cataclysmic Variable V1082 Sgr The Astrophysical Journal Close binary stars Cataclysmic variable stars Starlight polarization White dwarf stars Stellar magnetic fields Stellar accretion |
| title | Detection of the White Dwarf Spin of the Long-orbital Period Magnetic Cataclysmic Variable V1082 Sgr |
| title_full | Detection of the White Dwarf Spin of the Long-orbital Period Magnetic Cataclysmic Variable V1082 Sgr |
| title_fullStr | Detection of the White Dwarf Spin of the Long-orbital Period Magnetic Cataclysmic Variable V1082 Sgr |
| title_full_unstemmed | Detection of the White Dwarf Spin of the Long-orbital Period Magnetic Cataclysmic Variable V1082 Sgr |
| title_short | Detection of the White Dwarf Spin of the Long-orbital Period Magnetic Cataclysmic Variable V1082 Sgr |
| title_sort | detection of the white dwarf spin of the long orbital period magnetic cataclysmic variable v1082 sgr |
| topic | Close binary stars Cataclysmic variable stars Starlight polarization White dwarf stars Stellar magnetic fields Stellar accretion |
| url | https://doi.org/10.3847/1538-4357/adc380 |
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