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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: Monthly Notices of the Royal Astronomical Society; v. 492, n. 1, p. 1523-1529, FEB 2020.
• Web of Science Citations: 0

Abstract

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)

• FAPESP's process: 17/14289-3 - Magnetic Cataclysmic variables: secular evolution with the BSE code and emission modelling with the CYCLOPS code
• Grantee: Diogo Teixeira Belloni
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/23562-8 - Investigating the origin of Type Ia supernovae with the BSE code
• Grantee: Diogo Teixeira Belloni
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor