A fast spinning magnetic white dwarf in the double degenerate, super-Chandrasekhar system NLTT 12758
|dc.identifier.citation||Kawka, A. and Briggs, G. and Vennes, S. and Ferrario, L. and Paunzen, E. and Wickramasinghe, D. 2017. A fast spinning magnetic white dwarf in the double degenerate, super-Chandrasekhar system NLTT 12758. Monthly Notices of the Royal Astronomical Society. 466 (1): pp. 1127-1139.|
We present an analysis of the close double degenerate NLTT 12758, which is comprised of a magnetic white dwarf with a field of about 3.1 MG and an apparently non-magnetic white dwarf. We measured an orbital period of 1.154 d and found that the magnetic white dwarf is spinning around its axis with a period of 23 min. An analysis of the atmospheric parameters has revealed that the cooling ages of the two white dwarfs are comparable, suggesting that they formed within a short period of time from each other. Our modelling indicates that the non-magnetic white dwarf is more massive (M = 0.83 M) than its magnetic companion (M = 0.69 M) and that the total mass of the system is higher than the Chandrasekhar mass. Although the stars will not come into contact over a Hubble time, when they do come into contact, dynamically unstable mass transfer will take place leading to either an accretion induced collapse into a rapidly spinning neutron star or a Type Ia supernova.
|dc.publisher||Oxford University Press|
|dc.title||A fast spinning magnetic white dwarf in the double degenerate, super-Chandrasekhar system NLTT 12758|
|dcterms.source.title||Monthly Notices of the Royal Astronomical Society|
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
|curtin.department||Curtin Institute of Radio Astronomy (Physics)|