Are white dwarf magnetic fields in close binaries generated during common-envelope evolution?

Autor(es)

Belloni, Diogo ^{[1, 2]} ; Schreiber, Matthias R. ^{[2, 3]}

Afiliação do(s) autor(es)

^[1] Natl Inst Space Res, Av Astronautas 1758, BR-12227010 Sao Jose Dos Campos, SP - Brazil

^[2] Univ Valparaiso, Inst Fis & Astron, Av Gran Bretana 1111, Valparaiso 2360102 - Chile

^[3] Univ Valparaiso, Millenium Nucleus Planet Format, Av Gran Bretana 1111, Valparaiso 2360102 - Chile

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 492, n. 1, p. 1523-1529, FEB 2020.
• Citações Web of Science: 0

Resumo

Understanding the origin of the magnetic fields in white dwarfs (WDs) has been a puzzle for decades. A scenario that has gained considerable attention in the past years assumes that such magnetic fields are generated through a dynamo process during common-envelope evolution. We performed binary population models using an up-to-date version of the BSE code to confront the predictions of this model with observational results. We found that this hypothesis can explain only the observed distribution of WD magnetic fields in polars and pre-polars and the low-temperature WDs in pre-polars if it is re-scaled to fit the observational data. Furthermore, in its present version, the model fails to explain the absence of young, close detached WD+M-dwarf binaries harbouring hot magnetic WDs and predicts that the overwhelming majority of WDs in close binaries should be strongly magnetic, which is also in serious conflict with the observations. We conclude that either the common-envelope dynamo scenario needs to be substantially revised or a different mechanism is responsible for the generation of strong WD magnetic fields in close binaries. (AU)

• Processo FAPESP: 17/14289-3 - Variáveis cataclísmicas magnéticas: evolução secular com o código BSE e modelagem de emissão com o código CYCLOPS
• Beneficiário: Diogo Teixeira Belloni
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/23562-8 - Investigando a origem de supernovas do Tipo Ia com o código BSE
• Beneficiário: Diogo Teixeira Belloni
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado